stklcode/midi-footswitch
stklcode/midi-footswitch
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Stefan Kalscheuer 2018-09-09 11:44:02 +02:00
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@ -6,3 +6,39 @@ The current implementation supports 4 pushbuttons and 1 toggle switch (usually b
Hardware os based on a single ATtiny2313 microprocessor.
Original design indended to retrofit an analog Vox VFS5 footswitch to control am Axe-Fx II effect processor by Fractal Audio Systems.
## Hardware Specs
Hardware is designed to work with a power supply of 7 to 25V DC which is suitable for a standard 9V DC power supply or battery which is common for effect pedals.
The logic is powerd by a Atmel/Microchip ATtiny2313 processor, which can be swapped with about any AVR controller proividing 8 I/O ports and a USART interface.
MIDI signal is directly connected to the USART output (active low) of the controller and the 5V DC supply of the board through two 220 Ohm resistors.
| Pin on Controller | Pin on MIDI Jack | Function |
|:-----------------:|:----------------:|:----------------------:|
| X5.1 | 2 | Ground |
| X5.2 | 5 | Signal through 220 Ohm |
| X5.3 | 4 | +5V through 220 Ohm |
The provided layout is perfboard compatible with a more or less minimal layout to fit into the footswitch casing without removing the original PCB.
## Footswitch Layout and transmitted MIDI codes
| Label | BANK | CH1 | CH2 | CH3 | CH4 (Tuner) |
|:--------------:|:-------------------:|:---:|:---:|:---:|:-----------:|
| **LED** | ⭕ (1 green, 2 red) | - | - | - | - |
| **Button** | ⭗ | ⭗ | ⭗ | ⭗ | ⭗ |
| **MIDI Codes** | Bank 1: 0xB0 0x00 0x00 0xC0 0x00<br>Bank 2: 0xB0 0x00 0x01 0xC0 0x00 | 0xC0 0x00 | 0xC0 0x01 | 0xC0 0x02 | 0xB0 0x0F 0x7F |
As documented, the _CH4_ Button does not enable Channel 4 as expected, but sets the effect processor into tuner mode (which bypasses the output, so implicit mute).
Thus you effectively control 3 channels on each bank 1 and bank 2.
The LED is green for Bank 1 and red for Bank 2. When in tuner mode the LED flashes in the current color with a frequency of about 2 Hz.
## License
The project is licensed under [GPL v3](https://www.gnu.org/licenses/gpl-3.0.de.html) license.