37 lines
772 B
Markdown
37 lines
772 B
Markdown
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# Arduino
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Sensor interface running on Arduino Nano, communicating with Pi via UART.
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## Sketches
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| Folder | Purpose |
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|--------|---------|
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| `main/` | Primary telemetry sketch |
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## Current Capabilities
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- Battery voltage monitoring (voltage divider on A0)
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- Serial output at 9600 baud, 1Hz update rate
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## Planned
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- RPM sensing (pulse counting from ignition coil)
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- Engine temperature (thermocouple/NTC)
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- Gear position indicator
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- Turn signal / high beam status
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## Hardware
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- **MCU**: Arduino Nano (ATmega328P)
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- **Connection**: UART to Pi GPIO (TX→RX, RX→TX, common GND)
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- **Voltage sensing**: Resistor divider scaled for 0-20V input range
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## Protocol
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Simple text-based for now:
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```
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V_bat: 12.45V
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```
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Future: structured binary or JSON for multiple sensors.
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