f1ed809c71
- null-terminated TSV frame: V_bat, IMU (9 fields), RPM, gear - mock RPM ramps 800-8000, gear derived from RPM bands - voltage calibration offset - PROTOCOL.md documents wire format Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
1.5 KiB
1.5 KiB
Arduino
Sensor interface running on Arduino Nano, communicating with Pi via UART.
Sketches
| Folder | Purpose |
|---|---|
main/ |
Primary telemetry sketch |
Current Capabilities
- Battery voltage monitoring (voltage divider on A0)
- WT61 IMU/gyro via AltSoftSerial (9-axis: accel, gyro, euler angles)
- Duplex UART to Pi at 115200 baud, 10Hz telemetry output
- Simple text-based protocol for easy debugging
Dependencies
Install via Arduino Library Manager:
- AltSoftSerial by Paul Stoffregen - for WT61 IMU serial
Pin Assignments
| Pin | Function |
|---|---|
| A0 | Battery voltage (via divider) |
| D0 (RX) | Pi UART RX ← Arduino TX |
| D1 (TX) | Pi UART TX → Arduino RX |
| D8 | WT61 IMU RX (AltSoftSerial) |
| D9 | WT61 IMU TX (unused, AltSoftSerial fixed pin) |
| D13 | Status LED (heartbeat) |
Hardware
- MCU: Arduino Nano (ATmega328P)
- Pi Connection: UART at 115200 baud (TX→RX, RX→TX, common GND)
- IMU: WT61 module at 9600 baud, 20Hz output
- Voltage sensing: Resistor divider (100k/47k) scaled for 0-20V input
Protocol
TSV (tab-separated), null-terminated frames at 10Hz. See PROTOCOL.md for full specification.
Planned
- RPM sensing (pulse counting from ignition coil)
- Gear position indicator
Not planned
- Engine temperature (thermocouple/NTC)
Borderline do not want to do, simple but not really useful - Turn signal / high beam status
No need to do something the dash already does