migrate Drone CI workflow to GitHub Actions

Right now we need at least some knowledge about the values 0-4
representing five possible states of coffee making. Make it readable
without this knowledge.

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+---
+name: Build Firmware
+
+on: [push, pull_request]
+
+jobs:
+  build-firmware:
+    name: Compile
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup AVR-GCC
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends -y gcc-avr binutils-avr avr-libc
+          avr-gcc --version
+
+      - name: Compile
+        working-directory: firmware
+        run: make compile info

.gitignore

@@ -0,0 +1,7 @@
+*~
+.idea
+firmware/*.o
+firmware/*.elf
+firmware/*.hex
+hardware/*.b#*
+hardware/*.s#*

Firmware/Makefile

@@ -1,75 +0,0 @@
-#	SenseoControl 2.0
-#
-#	File:		Makefile
-#	Author:		Stefan Kalscheuer
-#	Date:		22.04.2013
-#
-# 	Platform:	ATtiny26
-# 				Internal RC-oscillator 8 MHz, CKDIV8 Enabled
-
-
-
-# Project specific settings
-TARGET = SenseoControl-2.0
-MCU = attiny26
-SRC = main.c
-
-# You probably want to change this to your own programming device
-
-# AVR ISP mkII
-#PGMDEV = avrispmkII
-#PGMOPT = -P usb # Try   -B 10   in case of programming errors
-
-# Pony-STK200
-#PGMDEV = pony-stk200
-#PGMOPT = -E noreset
-
-# STK500
-PGMDEV = stk500v2
-PGMOPT = -P /dev/ttyS0
-
-
-# AVR-GCC and AVRDUDE need to be installed
-CC = avr-gcc
-OBJCOPY = avr-objcopy
-AVRDUDE = avrdude
-REMOVE = rm -f
-
-# Some C flags
-CFLAGS = -Wall -Os
-
-help:
-	@echo
-	@echo "Availiable targets:"
-	@echo "    help - Displays this help"
-	@echo
-	@echo "    compile - Compiles source code"
-	@echo "    info - Outputs device memory information"
-	@echo "    program - Programs the device"
-	@echo "    clean - Deletes temporary files"
-	@echo "    fuses - Writes fuse settings to device (necessary only once per device)"
-	@echo
-	@echo "    all - Compile, info, program, clean"
-	@echo
-	@echo "IMPORTANT: Device programming may only be possible as super user"
-	@echo
-	@echo "See Makefile for contact information."
-	@echo
-
-all: compile info program clean
-
-compile:
-	@$(CC) $(CFLAGS) -mmcu=$(MCU) $(SRC) -o $(TARGET).elf
-	@$(OBJCOPY) -O ihex -j .text -j .data $(TARGET).elf $(TARGET).hex
-
-info:
-	avr-size $(TARGET).elf
-
-program:
-	@$(AVRDUDE) -p $(MCU) -q -q -u -V -c $(PGMDEV) $(PGMOPT) -U flash:w:$(TARGET).hex:i
-
-fuses:
-	@$(AVRDUDE) -p $(MCU) -q -q -u -V -c $(PGMDEV) $(PGMOPT) -U lfuse:w:0xE1:m -U hfuse:w:0x12:m
-
-clean:
-	@$(REMOVE) $(TARGET).elf

Firmware/main.c

@@ -1,412 +0,0 @@
-/**	SenseoControl 2.0
- *
- *	File:     main.c
- *	Author:   Stefan Kalscheuer
- *	Date:     22.04.2013
- *	Comments: Main program
- *            Previous project by Paul Wilhelm (2009) - http://mosfetkiller.de/?s=kaffeecontroller
- *
- * Platform:  ATtiny26
- *            Internal RC-oscillator 8 MHz, CKDIV8 Enabled
- *
- * License:   GNU GPL v3 (see License.txt)
- */
-
-#define F_CPU	1000000UL
-
-// includes
-#include <util/delay.h>
-#include <avr/interrupt.h>
-#include <avr/io.h>
-#include "main.h"
-
-                                                                        // variables:
-volatile uint16_t ms_counter = 0;                                       // global and universal time counter (ms) and second-counter (for AutoOff)
-volatile uint8_t sec_counter = 0;
-volatile uint16_t button_1_cup_counter = 0, button_2_cup_counter = 0;   // button counter
-volatile uint8_t button_power_counter = 0;
-volatile uint8_t led = 0;                                               // LED status flags
-volatile uint8_t flags = 0;                                             // Flags: * * * * esc clean temperature water
-volatile uint8_t make_coffee = 0, pump_time = 0;                        // pump time, clean mode flag
-
-int main (void)
-{
-  init ();                                              // initialization
-  power_off ();                                         // power off after init sequece
-
-  while (1)                                             // main loop
-  {
-    if (sec_counter >= AUTO_OFF_THRESHOLD)
-      button_power_counter = BUTTON_THRESHOLD;          // check for AutoOff Timer (generate OnOff-button push)
-
-    get_water ();                                       // update water state
-    get_temperature ();                                 // update temperature
-
-    if (button_power_counter >= BUTTON_THRESHOLD)       // button "OnOff" pushed:
-    {
-      set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);        // Boiler off
-      make_coffee = 0;                                  // clear coffee flag
-
-      while (button_power_counter > 0)
-        ;                                               // wait until button is releasd (debounce)
-
-      power_off ();                                     // call power off sequence
-
-      button_power_counter = BUTTON_THRESHOLD;          // debounce again after wake up
-      while (button_power_counter > 0)
-        ;
-    }
-
-    if (button_1_cup_counter >= BUTTON_CLEAN_THR
-        && button_2_cup_counter >= BUTTON_CLEAN_THR)    // both coffee buttons pushed: clean mode:
-    {
-      set_bit(flags, FLAG_CLEAN);                       // clean flag true
-      led = BLUE;                                       // set blue LED
-      while (button_1_cup_counter > 0 && button_2_cup_counter > 0)
-        ;                                               // debounce buttons
-    }
-
-    else if (button_1_cup_counter >= BUTTON_THRESHOLD
-        && button_2_cup_counter < BUTTON_THRESHOLD)     // left coffee button pushed: call espresso
-    {
-      sec_counter = 0;                                  // reset AutoOff counter
-
-      if ((flags & 0b00000011) == 3)                    // machine ready:
-      {
-        while (button_1_cup_counter > 0)                // check if button is pushed long time
-        {
-          if (button_1_cup_counter > BUTTON_LONG_THR)   // button pushed for a long time:
-          {
-            make_coffee = 1;                            // set coffee flag to 1 (1 espresso)
-            button_1_cup_counter = 0;                   // clear button counter
-          }
-        }
-        if (make_coffee != 1)
-          make_coffee = 3;                              // set coffee flag to 3 (1 coffee) else
-      }
-      else if(COFFEE_WISH) {                            // Save coffee wish
-        make_coffee = 3;
-      }
-    }
-
-    else if (button_1_cup_counter < BUTTON_THRESHOLD
-        && button_2_cup_counter >= BUTTON_THRESHOLD)    // right coffee button pushed: call coffee
-    {
-      sec_counter = 0;                                  // reset AutoOff counter
-
-      if ((flags & 0b00000011) == 3)                    // machine ready:
-      {
-        while (button_2_cup_counter > 0)                // check if button is pushed long time
-        {
-          if (button_2_cup_counter > BUTTON_LONG_THR)   // button pushed for a long time:
-          {
-            make_coffee = 2;                            // set coffee flag to 2 (2 espresso)
-            button_2_cup_counter = 0;                   // clear button counter
-          }
-        }
-        if (make_coffee != 2)
-          make_coffee = 4;                              //	set coffee flag to 4 (2 coffee) else
-      }
-      else if(COFFEE_WISH) {                            // Save coffee wish
-        make_coffee = 4;
-      }
-    }
-
-    if (bit_is_set(flags, FLAG_WATER))                  // water OK:
-    {
-      if (bit_is_set(flags, FLAG_CLEAN))                // if clean-flag is set:
-      {
-        set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);      // boiler off
-        clear_bit(flags, FLAG_ESC);                     // clear escape flag
-
-        while (bit_is_set(flags, FLAG_WATER) && bit_is_clear(flags, FLAG_ESC))
-        {                                               // pump until water is empty or escape flag is set
-          unsigned int sense = detect_zero_crossing (); // detect zero crossing
-          if (sense <= 100)
-          {
-            clear_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);  // generate trigger impulse for pump triac
-            _delay_ms (3);
-            set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
-          }
-          get_water ();                               // update water state
-
-          if (button_power_counter > BUTTON_THRESHOLD)
-            set_bit(flags, FLAG_ESC);                 // check for power button counter and set escape flag
-        }
-        clear_bit(flags, FLAG_CLEAN);                 // clear clean flag
-      }
-
-      else if (bit_is_set(flags, FLAG_TEMPERATURE))   // temperature OK:
-      {
-        set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);    // boiler off
-        led = GREEN;                                  // set green LED
-
-        if (make_coffee > 0)                          // if coffee flag is set:
-        {
-          if (make_coffee < 3)
-            led = ORANGE_BLINK;                       // set orange LED blink
-          else
-            led = GREEN_BLINK;                        // set green LED blink
-
-          if (make_coffee == 1)
-            pump_time = TIME_1_ESPRESSO;              // 1 cup of espresso (2s preinfusion included)
-          else if (make_coffee == 2)
-            pump_time = TIME_2_ESPRESSO;              // 2 cups of espresso (2s preinfusion included)
-          else if (make_coffee == 3)
-            pump_time = TIME_1_COFFEE;                // 1 cup of coffee
-          else if (make_coffee == 4)
-            pump_time = TIME_2_COFFEE;                // 2 cups of coffee
-          else
-            make_coffee = 0;
-
-          sec_counter = 0;                            // reset user time counter
-          clear_bit(flags, FLAG_ESC);                 // clear escape flag
-
-          while (sec_counter < pump_time && bit_is_set(flags, FLAG_WATER) && bit_is_clear(flags, FLAG_ESC))
-          {                                           // loop until pump time is reached or water is empty
-            if (make_coffee > 2
-                || (sec_counter < 2 || sec_counter > 4))
-            {                                               // check for preinfusion break
-              unsigned int sense = detect_zero_crossing (); // detect zero crossing
-              if (sense <= 100)
-              {
-                clear_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);    // generate trigger impulse for pump triac
-                _delay_ms (3);
-                set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
-              }
-            }
-
-            get_water ();                             // update water state
-
-            if (button_power_counter > BUTTON_THRESHOLD)
-              set_bit(flags, FLAG_ESC);               // check for power button counter and set escape flag
-          }
-
-          set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);      // pump off
-          clear_bit(flags, FLAG_CLEAN);               // clear clean flag
-          make_coffee = 0;                            // clear coffee flag
-          sec_counter = 0;                            // reset AutoOff timer
-        }
-      }
-      else                                            // temperature too low:
-      {
-        clear_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);  //	boiler on
-        if (make_coffee > 0)                          // set red/blue LED blink if coffee wish is saved
-          led = VIOLET_BLINK;
-        else                                          // set red LED blink if no coffee wish is saved
-          led = RED_BLINK;
-      }
-    }
-    else                                              // water too low:
-    {
-      set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);      // boiler off
-      set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);          // pump off
-
-      led = BLUE_BLINK;                               // set blue LED blink
-    }
-
-  }
-}
-
-/* function:  init()
- * return:    void
- *
- * Initializes relevant bits, timer and ADC.
- */
-void init ()
-{
-  clear_bit(ZERO_CROSSING_ddr, ZERO_CROSSING_pin);  // zero crossing dection pins as input
-  clear_bit(ZERO_CROSSING_w, ZERO_CROSSING_pin);    // no internal pull-up (for ADC)
-
-  clear_bit(BUTTON_1_CUP_ddr, BUTTON_1_CUP_pin);    // button pins as input
-  set_bit(BUTTON_1_CUP_w, BUTTON_1_CUP_pin);        // activate internal pull-ups
-  clear_bit(BUTTON_2_CUP_ddr, BUTTON_2_CUP_pin);
-  set_bit(BUTTON_2_CUP_w, BUTTON_2_CUP_pin);
-  clear_bit(BUTTON_POWER_ddr, BUTTON_POWER_pin);
-  set_bit(BUTTON_POWER_w, BUTTON_POWER_pin);
-
-  set_bit(LED_RED_ddr, LED_RED_pin);                // LED pins as output
-  clear_bit(LED_RED_w, LED_RED_pin);                // clear outputs (LEDs off)
-  set_bit(LED_GREEN_ddr, LED_GREEN_pin);
-  clear_bit(LED_GREEN_w, LED_GREEN_pin);
-  set_bit(LED_BLUE_ddr, LED_BLUE_pin);
-  clear_bit(LED_BLUE_w, LED_BLUE_pin);
-
-  clear_bit(SENSOR_MAGNET_ddr, SENSOR_MAGNET_pin);  // sensor pins as input
-  clear_bit(SENSOR_MAGNET_w, SENSOR_MAGNET_pin);    // no internal pull-up (for ADC)
-  clear_bit(SENSOR_TEMP_ddr, SENSOR_TEMP_pin);
-  clear_bit(SENSOR_TEMP_w, SENSOR_TEMP_pin);
-
-  set_bit(TRIAC_BOILER_ddr, TRIAC_BOILER_pin);      // triac pins as output
-  set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);        // set outputs high (triac off)
-  set_bit(TRIAC_PUMP_ddr, TRIAC_PUMP_pin);
-  set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
-
-  ADCSR = (1 << ADEN) | (1 << ADPS1);               // enable ADC, prescaler division factor 4
-
-  //	TIMER1
-  set_bit(TCCR1B, CTC1);                            // set timer 1 to CTC-Mode
-  clear_bit(TCCR1B, CS11);                          // prescaler 8
-  set_bit(TCCR1B, CS12);
-  clear_bit(TCCR1B, CS11);
-  clear_bit(TCCR1B, CS10);
-  OCR1C = 124;                                      // period of 1 ms
-
-  cli ();                                           // disable interrupts
-
-  clear_bit(GIMSK, INT0);                           // disable interrupt 0
-
-  set_bit(TIMSK, TOIE1);                            // activate timer 1
-
-  sei ();                                           // enable interrupts
-}
-
-/* function:  power_off()
- * return:    void
- *
- * Clear bits and set controller to sleep mode.
- */
-void power_off ()
-{
-  cli ();                                   // disable interrupts
-  set_bit(GIMSK, INT0);                     // activate interrupt 0 (for wake-up)
-  clear_bit(TIMSK, TOIE1);                  // deactivate timer 1
-  sei ();                                   // enable interrupts
-
-  clear_bit(LED_RED_w, LED_RED_pin);        // clear LED outputs
-  clear_bit(LED_GREEN_w, LED_GREEN_pin);
-  clear_bit(LED_BLUE_w, LED_BLUE_pin);
-
-  set_bit(MCUCR, SM1);                      // activate power-down mode
-  clear_bit(MCUCR, SM0);
-  set_bit(MCUCR, SE);
-  asm volatile("sleep"::);
-
-                                            // entrance after wake-up:
-  ms_counter = 0;                         // reset counter
-  sec_counter = 0;
-  cli ();                                   // disable interrupts
-  clear_bit(GIMSK, INT0);                   // disable interrupt 0
-  set_bit(TIMSK, TOIE1);                    // enable timer 1
-  sei ();                                   //	enable interrupts
-}
-
-/* function:  get_water()
- *
- * Checks hall sensor for water state.
- */
-void get_water ()
-{
-  ADMUX = SENSOR_MAGNET_adc | (1 << ADLAR); // ADLAR
-  set_bit(ADCSR, ADSC);
-  loop_until_bit_is_clear (ADCSR, ADSC);
-  unsigned char sense = ADCH;
-  if ((bit_is_set(flags, FLAG_WATER) && sense > WATER_LOW) || (bit_is_clear(flags, FLAG_WATER) && sense >= WATER_OK))
-    set_bit(flags, FLAG_WATER);
-  else
-    clear_bit(flags, FLAG_WATER);
-}
-
-/* function:  get_temperature()
- *
- * Checks NTC sensor for temperature state.
- */
-void get_temperature ()
-{
-  ADMUX = SENSOR_TEMP_adc | (1 << ADLAR);   // ADLAR
-  set_bit(ADCSR, ADSC);
-  loop_until_bit_is_clear (ADCSR, ADSC);
-  unsigned char sense = ADCH;
-  if (sense >= OPERATING_TEMPERATURE)
-    set_bit(flags, FLAG_TEMPERATURE);
-  else
-    clear_bit(flags, FLAG_TEMPERATURE);
-}
-
-/* function:  detect_zero_crossing()
- * return:    unsigned int    ADC value
- *
- * Checks for zero crossing (with fixed offset)
- */
-unsigned int detect_zero_crossing ()
-{
-  ADMUX = ZERO_CROSSING_adc;
-  set_bit(ADCSR, ADSC);
-  loop_until_bit_is_clear (ADCSR, ADSC);
-  unsigned char sense_L = ADCL;
-  unsigned char sense_H = ADCH;
-  return (sense_H << 8) | sense_L;
-}
-
-/* interrupt function:  INT0_vect
- *
- * Dummy function for wake-up.
- */
-ISR ( INT0_vect)
-{
-}
-
-/* interrupt function:  TIMER1_OVF1_vect
- *
- * Timer interrupt. Increments counters and controls LED.
- */
-ISR ( TIMER1_OVF1_vect)
-{
-  if (ms_counter < 1000)
-    ms_counter++;           // global milliseconds counter and seconds counter (for AutoOff)
-  else
-  {
-    ms_counter = 0;
-    sec_counter++;
-  }
-
-  uint8_t leds_blink_on = (ms_counter < 500);   // status flag for blinking LEDs with 1Hz
-
-  if (led & (1 << LED_RED_ON) || (led & (1 << LED_RED_BLINK) && leds_blink_on))
-    set_bit(LED_RED_w, LED_RED_pin);
-  else
-    clear_bit(LED_RED_w, LED_RED_pin);
-  if (led & (1 << LED_GREEN_ON)
-      || (led & (1 << LED_GREEN_BLINK) && leds_blink_on))
-    set_bit(LED_GREEN_w, LED_GREEN_pin);
-  else
-    clear_bit(LED_GREEN_w, LED_GREEN_pin);
-  if (led & (1 << LED_BLUE_ON)
-      || (led & (1 << LED_BLUE_BLINK) && leds_blink_on))
-    set_bit(LED_BLUE_w, LED_BLUE_pin);
-  else
-    clear_bit(LED_BLUE_w, LED_BLUE_pin);
-
-  if (bit_is_clear (BUTTON_1_CUP_r, BUTTON_1_CUP_pin))
-  {                           // left button counter
-    if (button_1_cup_counter < 65535)
-      button_1_cup_counter++;
-  }
-  else
-  {
-    if (button_1_cup_counter > 0)
-      button_1_cup_counter--;
-  }
-
-  if (bit_is_clear (BUTTON_2_CUP_r, BUTTON_2_CUP_pin))
-  {                           // right button counter
-    if (button_2_cup_counter < 65535)
-      button_2_cup_counter++;
-  }
-  else
-  {
-    if (button_2_cup_counter > 0)
-      button_2_cup_counter--;
-  }
-
-  if (bit_is_clear (BUTTON_POWER_r, BUTTON_POWER_pin))
-  {                           // power button counter
-    if (button_power_counter < 255)
-      button_power_counter++;
-  }
-  else
-  {
-    if (button_power_counter > 0)
-      button_power_counter--;
-  }
-}

Firmware/main.h

@@ -1,121 +0,0 @@
-/**	SenseoControl 2.0
- *
- *  File:     main.h
- *  Author:   Stefan Kalscheuer
- *  Date:     22.04.2013
- *
- *  License:  GNU GPL v3 (see License.txt)
- */
-
-/*******************
- * USER SETTINGS
- */
-#define TIME_1_ESPRESSO       15    // pump times in seconds
-#define TIME_2_ESPRESSO       28
-#define TIME_1_COFFEE         26
-#define TIME_2_COFFEE         52
-#define OPERATING_TEMPERATURE 125   // ADC threshold for water temperature
-#define COFFEE_WISH           0     // save coffee wish while heating up
-/*
- *******************
- */
-
-//	functions for setting and clearing bits
-#define	set_bit(var, bit)	((var) |= (1 << (bit)))
-#define	clear_bit(var, bit)	((var) &= (unsigned)~(1 << (bit)))
-
-#define ZERO_CROSSING_w     PORTA   // zero crossing detection
-#define ZERO_CROSSING_r     PINA
-#define ZERO_CROSSING_pin   0
-#define ZERO_CROSSING_ddr   DDRA
-#define ZERO_CROSSING_adc   0
-
-#define BUTTON_1_CUP_w      PORTB   // left button
-#define BUTTON_1_CUP_r      PINB
-#define BUTTON_1_CUP_pin    4
-#define BUTTON_1_CUP_ddr    DDRB
-
-#define BUTTON_2_CUP_w      PORTB   // right button
-#define BUTTON_2_CUP_r      PINB
-#define BUTTON_2_CUP_pin    5
-#define BUTTON_2_CUP_ddr    DDRB
-
-#define BUTTON_POWER_w      PORTB   // power button
-#define BUTTON_POWER_r      PINB
-#define BUTTON_POWER_pin    6
-#define BUTTON_POWER_ddr    DDRB
-
-#define LED_RED_w           PORTA   // red LED
-#define LED_RED_r           PINA
-#define LED_RED_pin         3
-#define LED_RED_ddr         DDRA
-#define LED_RED_ON          0
-#define LED_RED_BLINK       1
-
-#define LED_GREEN_w         PORTA   // green LED
-#define LED_GREEN_r	        PINA
-#define LED_GREEN_pin       1
-#define LED_GREEN_ddr       DDRA
-#define LED_GREEN_ON        2
-#define LED_GREEN_BLINK     3
-
-#define LED_BLUE_w          PORTA   // blue LED
-#define LED_BLUE_r          PINA
-#define LED_BLUE_pin        2
-#define LED_BLUE_ddr        DDRA
-#define LED_BLUE_ON         4
-#define LED_BLUE_BLINK      5
-
-#define SENSOR_MAGNET_w     PORTA   // hall switch (water)
-#define SENSOR_MAGNET_r     PINA
-#define SENSOR_MAGNET_pin   5
-#define SENSOR_MAGNET_ddr   DDRA
-#define SENSOR_MAGNET_adc   4
-
-#define WATER_LOW           30      // ADC threshold for low water
-#define	WATER_OK            100     // ADC threshold for water OK
-
-#define SENSOR_TEMP_w       PORTA   // NTC (temperature)
-#define SENSOR_TEMP_r       PINA
-#define SENSOR_TEMP_pin     4
-#define SENSOR_TEMP_ddr     DDRA
-#define SENSOR_TEMP_adc     3
-
-#define TRIAC_BOILER_w      PORTA   // boiler triac
-#define TRIAC_BOILER_r      PINA
-#define TRIAC_BOILER_pin    6
-#define TRIAC_BOILER_ddr    DDRA
-
-#define TRIAC_PUMP_w        PORTA   // pump triac
-#define TRIAC_PUMP_r        PINA
-#define TRIAC_PUMP_pin      7
-#define TRIAC_PUMP_ddr      DDRA
-
-#define	AUTO_OFF_THRESHOLD  180     // AutoOff threshold (seconds)
-#define	BUTTON_CLEAN_THR    30      // button threshold for cleaning mode (ms)
-#define BUTTON_THRESHOLD    100     // button threshold (ms)
-#define BUTTON_LONG_THR     1500    // button threshold for long time push (ms)
-#define BUTTON_LIMIT        1600
-
-#define RED                 0b00000001
-#define RED_BLINK           0b00000010
-#define GREEN               0b00000100
-#define GREEN_BLINK         0b00001000
-#define BLUE                0b00010000
-#define BLUE_BLINK          0b00100000
-#define ORANGE              0b00000101
-#define ORANGE_BLINK        0b00001010
-#define VIOLET              0b00010001
-#define VIOLET_BLINK        0b00100010
-
-#define FLAG_WATER          0
-#define FLAG_TEMPERATURE    1
-#define FLAG_CLEAN          2
-#define FLAG_ESC            3
-
-                                      // prototypes:
-void init ();                         //  initialization
-void power_off ();                    //  power off to sleep mode
-void get_water ();                    //  update water state
-void get_temperature ();              //  update tehmerature state
-unsigned int detect_zero_crossing (); //  detect zero crossing

README.md

@@ -0,0 +1,110 @@
+View this project on [CADLAB.io](https://cadlab.io/node/863). 
+
+# Senseo Control 2.0 
+
+A completely rebuilt AVR based hard- and software for Senseo® HD782x coffee machine.
+It allows custom setting of cup size and temperature and includes simple support for a second cup size (e.g. espresso) by pushing the buttons longer (2s).
+
+The original project was documented in [this blog post](https://www.stklblog.de/blog/senseo-control-20) (German), including photos of the prototype.
+
+## Functionality
+
+The OEM functionality (coffee, rinsing, auto-off) has been reimplemented (indications adapted to RGB LED) with a few features on top. 
+
+### Features
+
+|         |  Input                           | Action                                               |
+|:-------:|:--------------------------------:|:----------------------------------------------------:|
+| ⬤ ⭗ ⬤ | push both coffee buttons         | rinsing cycle (pump cold water, until tank is empty) |
+| ⬤ ⭗ ⭕ | push single coffee button        | 1/2 cups of coffee                                   |
+| ⬤ ⭗ ⭕ | push single coffee button for 2s | 1/2 cups of espresso (shorter time, 2s pre-brewing)  |
+| ⭕ ⬤ ⭕ | push power button                | start / shutdown at any time                         |
+| ⭕ ⭗ ⭕ | 3 minutes idle                   | Auto-Off                                             |
+
+#### Optional Features
+
+* **Coffee wish** - if enabled (see below), the machine will memorize your coffee wish during heat-up and automatically 
+start the coffee when finished, indicating through a violet LED (instead of green) 
+
+
+### LED Signals
+
+| Color  | Light                                      | Flashing                                                     |
+|:------:|:------------------------------------------:|:------------------------------------------------------------:|
+| red    | -                                          | <span style="color:red">◍</span> heating up                  |
+| green  | <span style="color:green">⬤</span> ready  | <span style="color:green">◍</span> coffee running            |
+| orange | -                                          | <span style="color:orange">◍</span> espresso running         |
+| blue   | <span style="color:blue">⬤</span> rinsing | <span style="color:blue">◍</span> water empty                |
+| violet | -                                          | <span style="color:violet">◍</span> heating up (coffee wish) |
+
+
+## Platform
+
+### Hardware
+
+The hardware is based on an **ATtiny26** microcontroller with internal 8MHz RC oscillator.
+
+Power supply is provided by a small transforer with a _78L05_ linear regulator. 
+Pump and boiler are controlled by Triacs with isolated MOC30xx drivers.
+The original sensors (NTC for temperature, Hall for water tank switch) are directly attached to the new board.
+
+### Schematic and Layout
+
+The prototype has been built in THT on a perfboard, hence the layout provided is compatible to 2.54mm (100mil) grid.
+Might as well be used for a PCB. The board is designed to fit the HD7822 model.
+
+Files provided under _hardware/_ are compatible with CadSoft/Autodesk EAGLE™ 6 and above.
+
+### Firmware
+
+The firmware is written in _C_ and comes with a _Makefile_ for use with _avr-gcc_ and _avrdude_.
+There are configurations available for _STK500_, _AVR ISP mkII_ and _Pony-STK200_ which can be adapted to your setup.
+
+## Customization
+
+The code is designed to customize functions, timing, temperature and hardware pinning.
+To to so, set the corresponding fields in the _main.h_ file:
+
+| Flag                    | Default | Description                                  |
+|-------------------------|---------|----------------------------------------------|
+| `TIME_1_ESPRESSO`       | 15      | pump time 1 espresso (seconds)               |
+| `TIME_2_ESPRESSO`       | 28      | pump time 2 espressos (seconds)              |
+| `TIME_1_COFFEE`         | 26      | pump time 1 coffee (seconds)                 |
+| `TIME_2_COFFEE`         | 52      | pump time 2 coffees (seconds)                |
+| `OPERATING_TEMPERATURE` | 125     | water temperature (ADC value)                |
+| `AUTO_OFF_THRESHOLD`    | 180     | Auto-Off time (seconds  after last action)   |
+| `COFFEE_WISH`           | 0       | save coffee wish on heat-up (`1` to enable)  |
+
+Pinout, button-thresholds and LED-configuration is also present in this file (should be self-explaining).
+
+
+## Build Instructions
+* Required tools: _avr-gcc_, _avr-objcopy_, _avrdude_ (for flashing only), _make_
+* All sources are bundled in the `firmware` directory
+* Check `Makefile.config` for the correct settings, especially tool and port for automated flashing.
+* On first build you might want to set the correct fuse bits, so run `make fuses`
+* Run `make compile info program` for compilation, details about binary, and flashing
+* Check `make help` for all available commands
+
+## Notes
+
+The Triacs need heatsink.
+The prototype uses approx. 75 x 30 x 1.5 mm (3 x 1.2 x 0.06 in) aluminum sheet, which is about the minimum recommended with a maximum temperature around 70°C (158°F).
+
+<span style="background-color:lightyellow;padding:.5em;border-left:4px orange solid;display:block">**⚡ Danger - High Voltage ⚡**<br>
+Working on a live coffee machine involves voltages of 120/230V AC **!** This voltage is applied to the heatsinks and causes hazard on contact.<br>
+Please make sure you know what you are doing or consult an authorized professional.<br>
+<br>
+Cut the power before working on the device.
+First tests can be done without main power (supply the µC with 5V from the programmer), Triacs can be tested with low voltage (e.g. 12V~).
+On final test use an isolating transformer or at least a RCD.</span>
+
+
+## License
+
+The project is licensed under [GPL v3](https://www.gnu.org/licenses/gpl-3.0.de.html) license.
+
+## Disclaimer
+
+_"SENSEO"_ is a Trademark of _Koninklijke Philips N.V._ when used for coffee makers and a Trademark of _Sara Lee/De N.V._ when used for coffee pods.
+No claim is made to the exclusive right to use _Senseo_ apart from the mark as shown.

firmware/Makefile

@@ -0,0 +1,59 @@
+#############################################################################
+#  SenseoControl 2.0                                                        #
+#  Copyright (C) 2013-2018  Stefan Kalscheuer                               #
+#                                                                           #
+#  This program is free software: you can redistribute it and/or modify     #
+#  it under the terms of the GNU General Public License as published by     #
+#  the Free Software Foundation version 3.                                  #
+#                                                                           #
+#  This program is distributed in the hope that it will be useful,          #
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of           #
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            #
+#  GNU General Public License for more details.                             #
+#                                                                           #
+#   You should have received a copy of the GNU General Public License       #
+#   along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#############################################################################
+
+# Include environment config
+include Makefile.config
+
+# Project specific settings
+TARGET = SenseoControl-2.0
+MCU = attiny26
+SRC = main.c
+
+# Some C flags
+CFLAGS = -Wall -Wextra -Os
+
+help:
+	@echo
+	@echo "Availiable targets:"
+	@echo "    help     Displays this help"
+	@echo
+	@echo "    compile  Compiles source code"
+	@echo "    info     Outputs device memory information"
+	@echo "    program  Programs the device"
+	@echo "    clean    Deletes temporary files"
+	@echo "    fuses    Writes fuse settings to device (necessary only once per device)"
+	@echo
+	@echo "    all      Compile, info, program, clean"
+	@echo
+
+all: compile info program clean
+
+compile:
+	@$(CC) $(CFLAGS) -mmcu=$(MCU) $(SRC) -o $(TARGET).elf
+	@$(OBJCOPY) -O ihex -j .text -j .data $(TARGET).elf $(TARGET).hex
+
+info:
+	avr-size $(TARGET).elf
+
+program:
+	@$(AVRDUDE) -p $(MCU) -q -q -u -V -c $(PGMDEV) $(PGMOPT) -U flash:w:$(TARGET).hex:i
+
+fuses:
+	@$(AVRDUDE) -p $(MCU) -q -q -u -V -c $(PGMDEV) $(PGMOPT) -U lfuse:w:0xE1:m -U hfuse:w:0x12:m
+
+clean:
+	@$(REMOVE) $(TARGET).elf $(TARGET).hex

firmware/Makefile.config

@@ -0,0 +1,43 @@
+#############################################################################
+#  SenseoControl 2.0                                                        #
+#  Copyright (C) 2013-2018  Stefan Kalscheuer                               #
+#                                                                           #
+#  This program is free software: you can redistribute it and/or modify     #
+#  it under the terms of the GNU General Public License as published by     #
+#  the Free Software Foundation version 3.                                  #
+#                                                                           #
+#  This program is distributed in the hope that it will be useful,          #
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of           #
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            #
+#  GNU General Public License for more details.                             #
+#                                                                           #
+#   You should have received a copy of the GNU General Public License       #
+#   along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#############################################################################
+
+#
+# Set toolchain.
+# AVR-GCC and AVRDUDE need to be installed
+#
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+AVRDUDE = avrdude
+REMOVE = rm -f
+
+#
+# You probably want to change this to your own programming device.
+# Some commonly used examples shown below.
+#
+
+# STK500
+PGMDEV = stk500v2
+PGMOPT = -P /dev/ttyS0
+
+
+# AVR ISP mkII
+#PGMDEV = avrispmkII
+#PGMOPT = -P usb # Try   -B 10   in case of programming errors
+
+# Pony-STK200
+#PGMDEV = pony-stk200
+#PGMOPT = -E noreset

firmware/main.c

@@ -0,0 +1,428 @@
+/*****************************************************************************
+ *  SenseoControl 2.0                                                        *
+ *  Copyright (C) 2013-2022  Stefan Kalscheuer                               *
+ *                                                                           *
+ *  This program is free software: you can redistribute it and/or modify     *
+ *  it under the terms of the GNU General Public License as published by     *
+ *  the Free Software Foundation version 3.                                  *
+ *                                                                           *
+ *  This program is distributed in the hope that it will be useful,          *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
+ *  GNU General Public License for more details.                             *
+ *                                                                           *
+ *   You should have received a copy of the GNU General Public License       *
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.  *
+ *****************************************************************************/
+
+/**
+ * SenseoControl 2.0
+ *
+ * @file   main.c
+ * @author Stefan Kalscheuer
+ * @date   2013-04-22
+ * @brief  Main program
+ *
+ * Platform:  ATtiny26
+ *            Internal RC-oscillator 8 MHz, CKDIV8 Enabled
+ */
+
+#define F_CPU    1000000UL
+
+// includes
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include "main.h"
+
+// variables:
+volatile unsigned int time_counter;                 // Global time counter (ms).
+volatile unsigned int user_time_counter = 0;        // Universal time counter (ms).
+volatile unsigned int sec_counter = 0;              // Second-counter (for AutoOff).
+volatile unsigned int button_1_cup_counter = 0;     // Left button counter (1 cup).
+volatile unsigned int button_2_cup_counter = 0;     // Left button counter (2 cups).
+volatile unsigned char button_power_counter = 0;    // Power button counter.
+volatile unsigned char led = 0;                     // LED status flags.
+volatile unsigned char state;                       // Water-, temperature-, clean-flags.
+volatile unsigned char make_coffee = NO_COFFEE;     // Coffee mode flag.
+volatile unsigned char pump_time = 0;               // Pump time.
+
+/**
+ * Main program.
+ *
+ * @return This method should never terminate.
+ */
+int main(void) {
+    init();                                                 // Initialization.
+    power_off();                                            // Power off after init sequence.
+
+    while (1) {                                             // Main loop.
+        if (sec_counter >= AUTO_OFF_THRESHOLD) {
+            button_power_counter = BUTTON_THRESHOLD;        // Check for AutoOff Timer (generate OnOff-button push).
+        }
+
+        update_water();                                     // Update water state.
+        update_temperature();                               // Update temperature.
+
+        if (button_power_counter >= BUTTON_THRESHOLD) {     // Button "OnOff" pushed:
+            set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);      // Boiler off
+            make_coffee = NO_COFFEE;                        // Clear coffee flag.
+
+            while (button_power_counter > 0);               // Wait until button is released (debounce)
+
+            power_off();                                    // Call power off sequence
+
+            button_power_counter = BUTTON_THRESHOLD;        // Debounce again after wake up
+            while (button_power_counter > 0);
+        }
+
+        process_buttons();
+
+        if (state & S_WATER) {                                  // Water OK:
+            if (state & S_CLEAN) {                              // If clean-flag is set:
+                do_clean();
+            } else if (state & S_TEMP) {                        // Temperature OK:
+                set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);      // Boiler off.
+                led = GREEN;                                    // Set green LED.
+                if (make_coffee > NO_COFFEE) {                  // If coffee flag is set:
+                    do_coffee();
+                }
+            } else {                                            // Temperature too low.
+                clear_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);    // Boiler on.
+                if (make_coffee > NO_COFFEE) {                  // Set violet LED blink if coffee wish is saved.
+                    led = VIOLET_BLINK;
+                } else {                                        // Set red LED blink if no coffee wish is saved.
+                    led = RED_BLINK;
+                }
+            }
+        } else {                                                // Water too low:
+            set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);          // Boiler off.
+            set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);              // Pump off.
+            led = BLUE_BLINK;                                   // Set blue LED blink.
+        }
+    }
+}
+
+/**
+ * Initializes relevant bits, timer and ADC.
+ */
+void init() {
+    clear_bit(ZERO_CROSSING_ddr, ZERO_CROSSING_pin);    // Zero crossing detection pins as input.
+    clear_bit(ZERO_CROSSING_w, ZERO_CROSSING_pin);      // No internal pull-up (for ADC).
+
+    clear_bit(BUTTON_1_CUP_ddr, BUTTON_1_CUP_pin);      // Button pins as input.
+    set_bit(BUTTON_1_CUP_w, BUTTON_1_CUP_pin);          // Activate internal pull-ups.
+    clear_bit(BUTTON_2_CUP_ddr, BUTTON_2_CUP_pin);
+    set_bit(BUTTON_2_CUP_w, BUTTON_2_CUP_pin);
+    clear_bit(BUTTON_POWER_ddr, BUTTON_POWER_pin);
+    set_bit(BUTTON_POWER_w, BUTTON_POWER_pin);
+
+    set_bit(LED_RED_ddr, LED_RED_pin);                  // LED pins as output.
+    clear_bit(LED_RED_w, LED_RED_pin);                  // Clear outputs (LEDs off).
+    set_bit(LED_GREEN_ddr, LED_GREEN_pin);
+    clear_bit(LED_GREEN_w, LED_GREEN_pin);
+    set_bit(LED_BLUE_ddr, LED_BLUE_pin);
+    clear_bit(LED_BLUE_w, LED_BLUE_pin);
+
+    clear_bit(SENSOR_MAGNET_ddr, SENSOR_MAGNET_pin);    // Sensor pins as input.
+    clear_bit(SENSOR_MAGNET_w, SENSOR_MAGNET_pin);      // No internal pull-up (for ADC).
+    clear_bit(SENSOR_TEMP_ddr, SENSOR_TEMP_pin);
+    clear_bit(SENSOR_TEMP_w, SENSOR_TEMP_pin);
+
+    set_bit(TRIAC_BOILER_ddr, TRIAC_BOILER_pin);        // Triac pins as output.
+    set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);          // Set outputs high (triac off).
+    set_bit(TRIAC_PUMP_ddr, TRIAC_PUMP_pin);
+    set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
+
+    ADCSR = (1 << ADEN) | (1 << ADPS1);                 // Enable ADC, prescaler division factor 4.
+
+    // TIMER1
+    set_bit(TCCR1B, CTC1);                              // Set timer 1 to CTC-Mode.
+    clear_bit(TCCR1B, CS11);                            // Prescaler 8.
+    set_bit(TCCR1B, CS12);
+    clear_bit(TCCR1B, CS11);
+    clear_bit(TCCR1B, CS10);
+    OCR1C = 124;                                        // Period of 1 ms.
+
+    cli();                                              // Disable interrupts.
+    clear_bit(GIMSK, INT0);                             // Disable interrupt 0.
+    set_bit(TIMSK, TOIE1);                              // Activate timer 1.
+    sei();                                              // Enable interrupts.
+}
+
+/**
+ * Clear bits and set controller to sleep mode.
+ */
+void power_off(void) {
+    cli();                                  // Disable interrupts.
+    set_bit(GIMSK, INT0);                   // Activate interrupt 0 (for wake-up).
+    clear_bit(TIMSK, TOIE1);                // Deactivate timer 1.
+    sei();                                  // Re-enable interrupts.
+
+    clear_bit(LED_RED_w, LED_RED_pin);      // Clear LED outputs.
+    clear_bit(LED_GREEN_w, LED_GREEN_pin);
+    clear_bit(LED_BLUE_w, LED_BLUE_pin);
+
+    set_bit(MCUCR, SM1);                    // Activate power-down mode.
+    clear_bit(MCUCR, SM0);
+    set_bit(MCUCR, SE);
+    asm volatile("sleep"::);
+
+    // Entrance point after wake-up.
+    time_counter = 0;                       // Reset counter.
+    sec_counter = 0;
+    cli();                                  // Disable interrupts.
+    clear_bit(GIMSK, INT0);                 // Disable interrupt 0.
+    set_bit(TIMSK, TOIE1);                  // Enable timer 1.
+    sei();                                  // Re-enable interrupts.
+}
+
+/**
+ * Checks hall sensor for water level.
+ */
+void update_water(void) {
+    ADMUX = SENSOR_MAGNET_adc | (1 << ADLAR);
+    set_bit(ADCSR, ADSC);
+    loop_until_bit_is_clear(ADCSR, ADSC);
+    unsigned char sense = ADCH;
+    if (((state & S_WATER) && sense > WATER_LOW) || (!(state & S_WATER) && sense >= WATER_OK)) {
+        set_bit(state, S_WATER);
+    } else {
+        clear_bit(state, S_WATER);
+    }
+}
+
+/**
+ * Checks NTC sensor for temperature state.
+ */
+void update_temperature(void) {
+    ADMUX = SENSOR_TEMP_adc | (1 << ADLAR);
+    set_bit(ADCSR, ADSC);
+    loop_until_bit_is_clear(ADCSR, ADSC);
+    unsigned char sense = ADCH;
+    if (sense >= OPERATING_TEMPERATURE) {
+        set_bit(state, S_TEMP);
+    } else {
+        clear_bit(state, S_TEMP);
+    }
+}
+
+/**
+ * Checks for zero crossing (with fixed offset)
+ *
+ * @return Raw ADC value.
+ */
+unsigned int detect_zero_crossing() {
+    ADMUX = ZERO_CROSSING_adc;
+    set_bit(ADCSR, ADSC);
+    loop_until_bit_is_clear(ADCSR, ADSC);
+    unsigned char sense_L = ADCL;
+    unsigned char sense_H = ADCH;
+    return (sense_H << 8) | sense_L;
+}
+
+/**
+ * Process button inputs and update states accordingly.
+ */
+static void process_buttons(void) {
+    if (button_1_cup_counter >= BUTTON_CLEAN_THR && button_2_cup_counter >= BUTTON_CLEAN_THR) {
+        // Both coffee buttons pushed: enter clean mode.
+        set_bit(state, S_CLEAN);    // Set clean flag.
+        led = BLUE;                 // Set blue LED.
+        while (button_1_cup_counter > 0 && button_2_cup_counter > 0);   // Debounce buttons.
+    } else if (button_1_cup_counter >= BUTTON_THRESHOLD && button_2_cup_counter < BUTTON_THRESHOLD) {
+        // Left coffee button pushed: call espresso.
+        sec_counter = 0;    // Reset AutoOff counter.
+
+        if ((state & S_WATER) && (state & S_TEMP)) {            // Machine ready:
+            while (button_1_cup_counter > 0) {                  // Check if button is pushed long time.
+                if (button_1_cup_counter > BUTTON_LONG_THR) {   // Button pushed for a long time:
+                    make_coffee = ONE_ESPRESSO;                   // Set coffee flag to 1 (1 espresso).
+                    button_1_cup_counter = 0;                   // Clear button counter.
+                }
+            }
+            if (make_coffee != ONE_ESPRESSO) {
+                make_coffee = ONE_COFFEE;                       // Set coffee flag to 3 (1 coffee) otherwise.
+            }
+        } else if (COFFEE_WISH) {                               // Save coffee wish.
+            make_coffee = ONE_COFFEE;
+        }
+    } else if (button_1_cup_counter < BUTTON_THRESHOLD && button_2_cup_counter >= BUTTON_THRESHOLD) {
+        // Right coffee button pushed: call coffee.
+        sec_counter = 0;                                        // Reset AutoOff counter.
+
+        if ((state & S_WATER) && (state & S_TEMP)) {            // Machine ready:
+            while (button_2_cup_counter > 0) {                  // Check if button is pushed long time.
+                if (button_2_cup_counter > BUTTON_LONG_THR) {   // Button pushed for a long time:
+                    make_coffee = TWO_ESPRESSO;                 // Set coffee flag to 2 (2 espresso).
+                    button_2_cup_counter = 0;                   // Clear button counter.
+                }
+            }
+            if (make_coffee != TWO_ESPRESSO) {
+                make_coffee = TWO_COFFEE;                       // Set coffee flag to 4 (2 coffee) otherwise.
+            }
+        } else if (COFFEE_WISH) {                               // Save coffee wish
+            make_coffee = TWO_COFFEE;
+        }
+    }
+}
+
+/**
+ * Execute cleaning routine.
+ * Pump water without additional heating, until the water tank is empty or the power button is pushed.
+ */
+static void do_clean(void) {
+    set_bit(TRIAC_BOILER_w, TRIAC_BOILER_pin);          // Boiler off.
+    clear_bit(state, S_ESC);                            // Init escape-flag.
+
+    // Pump until water is empty or escape flag is set.
+    while ((state & S_WATER) && (state & S_ESC)) {
+        // Detect zero crossing and trigger impulse for the pump triac.
+        if (detect_zero_crossing() <= 100) {
+            clear_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
+            _delay_ms(3);
+            set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
+        }
+
+        // Update water state.
+        update_water();
+
+        // Check power button counter and set escape flag.
+        if (button_power_counter > BUTTON_THRESHOLD) {
+            set_bit(state, S_ESC);
+        }
+    }
+
+    // Clear clean flag.
+    clear_bit(state, S_CLEAN);
+}
+
+/**
+ * Execute the actual coffee making routine.
+ */
+static void do_coffee(void) {
+    // Set orange LED blink for espresso and green blink for coffee.
+    if (IS_ESPRESSO(make_coffee)) {
+        led = ORANGE_BLINK;
+    } else {
+        led = GREEN_BLINK;
+    }
+
+    // Determine the correct pump time for espresso (including 2s preinfusion break) and coffee.
+    switch (make_coffee) {
+        case ONE_ESPRESSO:
+            pump_time = TIME_1_ESPRESSO;
+            break;
+        case 2:
+            pump_time = TIME_2_ESPRESSO;
+            break;
+        case ONE_COFFEE:
+            pump_time = TIME_1_COFFEE;
+            break;
+        case TWO_COFFEE:
+            pump_time = TIME_2_COFFEE;
+            break;
+        default:
+            make_coffee = NO_COFFEE;
+    }
+
+    user_time_counter = 0;      // Reset user time counter.
+    clear_bit(state, S_ESC);    // Init escape flag.
+
+    // loop until pump time is reached or water is empty
+    while (user_time_counter < (pump_time * 1000) && (state & S_WATER) && !(state & S_ESC)) {
+        // Check for preinfusion break.
+        if ((IS_COFFEE(make_coffee) || (user_time_counter < 2000 || user_time_counter > 4000)) &&
+            detect_zero_crossing() <= 100) {            // Detect zero crossing.
+            // Generate trigger impulse for pump triac.
+            clear_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
+            _delay_ms(3);
+            set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);
+        }
+
+        // Update water state.
+        update_water();
+
+        // Check for power button counter and set escape flag.
+        if (button_power_counter > BUTTON_THRESHOLD) {
+            set_bit(state, S_ESC);
+        }
+    }
+
+    set_bit(TRIAC_PUMP_w, TRIAC_PUMP_pin);  // Pump off
+    make_coffee = NO_COFFEE;                // Clear coffee flag.
+    sec_counter = 0;                        // Reset AutoOff timer.
+}
+
+/**
+ * Dummy function for wake-up.
+ */
+ISR ( INT0_vect) {
+    // Nothing to do here.
+}
+
+/**
+ * Timer interrupt. Increments counters and controls LED.
+ */
+ISR ( TIMER1_OVF1_vect) {
+    if (time_counter < 1000)
+        time_counter++;         // Global milliseconds counter and seconds counter (for AutoOff).
+    else {
+        time_counter = 0;
+        sec_counter++;
+    }
+    user_time_counter++;        // Universal counter (for pump time).
+
+    unsigned char leds_blink_on;         // Status flag for blinking LEDs with 1Hz.
+    if (time_counter < 499) {
+        leds_blink_on = 1;
+    } else {
+        leds_blink_on = 0;
+    }
+
+    if (led & (1 << LED_RED_ON) || (led & (1 << LED_RED_BLINK) && leds_blink_on)) {
+        set_bit(LED_RED_w, LED_RED_pin);
+    } else {
+        clear_bit(LED_RED_w, LED_RED_pin);
+    }
+    if (led & (1 << LED_GREEN_ON) || (led & (1 << LED_GREEN_BLINK) && leds_blink_on)) {
+        set_bit(LED_GREEN_w, LED_GREEN_pin);
+    } else {
+        clear_bit(LED_GREEN_w, LED_GREEN_pin);
+    }
+    if (led & (1 << LED_BLUE_ON) || (led & (1 << LED_BLUE_BLINK) && leds_blink_on)) {
+        set_bit(LED_BLUE_w, LED_BLUE_pin);
+    } else {
+        clear_bit(LED_BLUE_w, LED_BLUE_pin);
+    }
+
+    if (bit_is_clear(BUTTON_1_CUP_r, BUTTON_1_CUP_pin)) {   // Left button counter.
+        if (button_1_cup_counter < 65535) {
+            button_1_cup_counter++;
+        }
+    } else {
+        if (button_1_cup_counter > 0) {
+            button_1_cup_counter--;
+        }
+    }
+
+    if (bit_is_clear(BUTTON_2_CUP_r, BUTTON_2_CUP_pin)) {   // Right button counter.
+        if (button_2_cup_counter < 65535) {
+            button_2_cup_counter++;
+        }
+    } else {
+        if (button_2_cup_counter > 0) {
+            button_2_cup_counter--;
+        }
+    }
+
+    if (bit_is_clear(BUTTON_POWER_r, BUTTON_POWER_pin)) {   // Power button counter.
+        if (button_power_counter < 255) {
+            button_power_counter++;
+        }
+    } else {
+        if (button_power_counter > 0) {
+            button_power_counter--;
+        }
+    }
+}

firmware/main.h

@@ -0,0 +1,149 @@
+/*****************************************************************************
+ *  SenseoControl 2.0                                                        *
+ *  Copyright (C) 2013-2018  Stefan Kalscheuer                               *
+ *                                                                           *
+ *  This program is free software: you can redistribute it and/or modify     *
+ *  it under the terms of the GNU General Public License as published by     *
+ *  the Free Software Foundation version 3.                                  *
+ *                                                                           *
+ *  This program is distributed in the hope that it will be useful,          *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
+ *  GNU General Public License for more details.                             *
+ *                                                                           *
+ *   You should have received a copy of the GNU General Public License       *
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.  *
+ *****************************************************************************/
+
+/**
+ * SenseoControl 2.0
+ *
+ * @file   main.h
+ * @author Stefan Kalscheuer
+ * @date   2013-04-22
+ */
+
+/********************
+ * User settings:
+ */
+#define TIME_1_ESPRESSO       15    // Pump times in seconds.
+#define TIME_2_ESPRESSO       28
+#define TIME_1_COFFEE         26
+#define TIME_2_COFFEE         52
+#define OPERATING_TEMPERATURE 125   // ADC threshold for water temperature.
+#define COFFEE_WISH           0     // Save coffee wish while heating up.
+/*
+ ********************/
+
+// Function macros for setting and clearing bits.
+#define set_bit(var, bit)   ((var) |= (1 << (bit)))
+#define clear_bit(var, bit) ((var) &= (unsigned)~(1 << (bit)))
+
+#define ZERO_CROSSING_w     PORTA   // Zero crossing detection.
+#define ZERO_CROSSING_r     PINA
+#define ZERO_CROSSING_pin   0
+#define ZERO_CROSSING_ddr   DDRA
+#define ZERO_CROSSING_adc   0
+
+#define BUTTON_1_CUP_w      PORTB   // Left button.
+#define BUTTON_1_CUP_r      PINB
+#define BUTTON_1_CUP_pin    4
+#define BUTTON_1_CUP_ddr    DDRB
+
+#define BUTTON_2_CUP_w      PORTB   // Right button.
+#define BUTTON_2_CUP_r      PINB
+#define BUTTON_2_CUP_pin    5
+#define BUTTON_2_CUP_ddr    DDRB
+
+#define BUTTON_POWER_w      PORTB   // Power button.
+#define BUTTON_POWER_r      PINB
+#define BUTTON_POWER_pin    6
+#define BUTTON_POWER_ddr    DDRB
+
+#define LED_RED_w           PORTA   // Red LED.
+#define LED_RED_r           PINA
+#define LED_RED_pin         3
+#define LED_RED_ddr         DDRA
+#define LED_RED_ON          0
+#define LED_RED_BLINK       1
+
+#define LED_GREEN_w         PORTA   // Green LED.
+#define LED_GREEN_r         PINA
+#define LED_GREEN_pin       1
+#define LED_GREEN_ddr       DDRA
+#define LED_GREEN_ON        2
+#define LED_GREEN_BLINK     3
+
+#define LED_BLUE_w          PORTA   // Blue LED.
+#define LED_BLUE_r          PINA
+#define LED_BLUE_pin        2
+#define LED_BLUE_ddr        DDRA
+#define LED_BLUE_ON         4
+#define LED_BLUE_BLINK      5
+
+#define SENSOR_MAGNET_w     PORTA   // Hall switch (water).
+#define SENSOR_MAGNET_r     PINA
+#define SENSOR_MAGNET_pin   5
+#define SENSOR_MAGNET_ddr   DDRA
+#define SENSOR_MAGNET_adc   4
+
+#define WATER_LOW           30      // ADC threshold for low water.
+#define WATER_OK            100     // ADC threshold for water OK.
+
+#define SENSOR_TEMP_w       PORTA   // NTC (temperature)
+#define SENSOR_TEMP_r       PINA
+#define SENSOR_TEMP_pin     4
+#define SENSOR_TEMP_ddr     DDRA
+#define SENSOR_TEMP_adc     3
+
+#define TRIAC_BOILER_w      PORTA   // Boiler triac.
+#define TRIAC_BOILER_r      PINA
+#define TRIAC_BOILER_pin    6
+#define TRIAC_BOILER_ddr    DDRA
+
+#define TRIAC_PUMP_w        PORTA   // Pump triac.
+#define TRIAC_PUMP_r        PINA
+#define TRIAC_PUMP_pin      7
+#define TRIAC_PUMP_ddr      DDRA
+
+#define AUTO_OFF_THRESHOLD  180     // AutoOff threshold (seconds).
+#define BUTTON_CLEAN_THR    30      // Button threshold for cleaning mode (ms).
+#define BUTTON_THRESHOLD    100     // Button threshold (ms).
+#define BUTTON_LONG_THR     1500    // Button threshold for long time push (ms).
+
+// Global state flags.
+#define S_WATER             0
+#define S_TEMP              1
+#define S_CLEAN             2
+#define S_ESC               3
+
+// Coffee mode flags.
+#define NO_COFFEE     0
+#define ONE_ESPRESSO  1
+#define TWO_ESPRESSO  2
+#define ONE_COFFEE    3
+#define TWO_COFFEE    4
+#define IS_COFFEE(VAR) (VAR > 2)
+#define IS_ESPRESSO(VAR) (VAR > 0 && VAR < 3)
+
+// LED color flags.
+#define RED                 0b00000001
+#define RED_BLINK           0b00000010
+#define GREEN               0b00000100
+#define GREEN_BLINK         0b00001000
+#define BLUE                0b00010000
+#define BLUE_BLINK          0b00100000
+#define ORANGE              0b00000101
+#define ORANGE_BLINK        0b00001010
+#define VIOLET              0b00010001
+#define VIOLET_BLINK        0b00100010
+
+// Prototypes:
+void init(void);                            //  Initialization.
+void power_off(void);                       //  Power off to sleep mode.
+void update_water(void);                    //  Update water state.
+void update_temperature(void);              //  Update temperature state.
+unsigned int detect_zero_crossing(void);    //  Detect zero crossing.
+static void process_buttons(void);
+static void do_coffee(void);
+static void do_clean(void);

hardware/partlist.txt

@@ -0,0 +1,43 @@
+Partlist
+
+Exported from SenseoControl 2.0
+
+Part     Value           Device            Package         Library         Sheet
+
+B1       B500D           B-DIL             B-DIL           rectifier       1
+C1       470µ            CPOL-EUE2.5-6     E2,5-6          resistor        1
+C2       100n            C-EU025-024X044   C025-024X044    resistor        1
+C4       100n            C-EU025-024X044   C025-024X044    resistor        1
+C5       100n            C-EU025-024X044   C025-024X044    resistor        1
+C6       1µ              CPOL-EUTT2D5      TT2D5           resistor        1
+D1       1N4004          DIODE-D-2.5       D-2.5           diode           1
+D2       5V1             ZENER-DIODEZD-7.5 ZDIO-7.5        diode           1
+IC1      78L05           78L2              TO92-A          linear          1
+IC2      TINY26P         TINY26P           DIL20           atmel           1
+LED1     LF5             LF5               LF5             led-rgb         1
+OK1      MOC3031M        MOC3031M          DIL06           optocoupler     1
+OK2      MOC3031M        MOC3031M          DIL06           optocoupler     1
+R1       10k             R-EU_0207/12      0207/12         resistor        1
+R2       150             R-EU_0204/7       0204/7          resistor        1
+R3       20              R-EU_0204/7       0204/7          resistor        1
+R4       120             R-EU_0204/7       0204/7          resistor        1
+R5       150             R-EU_0204/7       0204/7          resistor        1
+R6       150             R-EU_0204/7       0204/7          resistor        1
+R7       1k              R-EU_0204/7       0204/7          resistor        1
+R8       1k              R-EU_0204/7       0204/7          resistor        1
+R9       1k              R-EU_0204/7       0204/7          resistor        1
+R10      1k              R-EU_0204/7       0204/7          resistor        1
+R11      10k             R-EU_0204/7       0204/7          resistor        1
+R12      1k              R-EU_0204/7       0204/7          resistor        1
+R13      100k            R-EU_0204/7       0204/7          resistor        1
+R14      100k            R-EU_0204/7       0204/7          resistor        1
+S1       POWER           10-XXA            B3F-10XX-A      switch-omron    1
+S2       1 CUP           10-XXA            B3F-10XX-A      switch-omron    1
+S3       2 CUPS          10-XXA            B3F-10XX-A      switch-omron    1
+T1       BT136           BT136             TO220AB         triac           1
+T2       BT136           BT136             TO220AB         triac           1
+TR1      230V/6V 0.35VA  EE20-1            EE20-1          trafo           1
+X2       MKDSN1,5/5-5,08 MKDSN1,5/5-5,08   MKDSN1,5/5-5,08 con-phoenix-508 1
+X4       Hall-Switch     MPT2              2POL254         con-phoenix-254 1
+X5       NTC             MPT2              2POL254         con-phoenix-254 1
+X6       ISP             PINHD-2X3         2X03            pinhead         1