47 lines
1.2 KiB
Markdown
47 lines
1.2 KiB
Markdown
# geode-piano
|
|
|
|
Digital piano firmware for the Raspberry Pi Pico.
|
|
This project only attempts to expose the keyboard as a MIDI device.
|
|
|
|
## installation
|
|
|
|
- Clone project.
|
|
- Go into project directory.
|
|
- Install `elf2uf2-rs`.
|
|
- `cargo run --bin --release geode-piano`
|
|
|
|
## materials
|
|
|
|
- 1 Raspberry Pi Pico (preferably with pre-soldered headers)
|
|
- 2 MCP23017 I/O extender chips, DIP format
|
|
- 2 pull-up resistors for I²C (1-10kΩ), these are optional but recommended
|
|
- 1 USB to Micro-USB cable with data transfer
|
|
- Many jumper cables
|
|
- Breadboard
|
|
|
|
## wiring
|
|
|
|
### rails
|
|
|
|
- Pin 3 -> GND rail
|
|
- Pin 36 (3V3OUT) -> power (positive) rail
|
|
|
|
### i2c
|
|
|
|
Let's call the closest MCP23017 chip to the Pico MCP A, and the further one MCP B.
|
|
|
|
- GP16 -> MCP A SDA
|
|
- GP17 -> MCP A SCL
|
|
- Pull-up resistor from GP16 to power rail
|
|
- Pull-up resistor from GP17 to power rail
|
|
|
|
For both MCP23017s:
|
|
|
|
- MCP RESET -> power rail
|
|
- MCP A0, A1, A2 -> GND rail for 0, power rail for 1
|
|
- MCP A should be 0x20 (GND, GND, GND), MCP B 0x27 (3V3, 3V3, 3V3)
|
|
- MCP VDD -> power rail
|
|
- MCP VSS -> GND rail
|
|
|
|
If you are missing dependencies, consult [Alex Wilson's guide](https://www.alexdwilson.dev/learning-in-public/how-to-program-a-raspberry-pi-pico) on Rust Pico development.
|