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# 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.
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- Install `elf2uf2-rs` .
- `cargo run --bin --release geode-piano`
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## 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
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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.
