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docs(hardware): add dual-channel GPIO mapping details

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Seth
2026-03-11 21:21:12 +00:00
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HARDWARE.md
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@@ -39,6 +39,14 @@ Unknowns are marked `TBD` instead of guessed.
- Raspberry Pi drives each relay channel independently. - Raspberry Pi drives each relay channel independently.
- Thermocouple boards are connected to Pi GPIO. - Thermocouple boards are connected to Pi GPIO.
## GPIO Wiring (User-Confirmed)
- Thermocouple channel 1 GPIO lines: `GPIO 5`, `GPIO 8`, `GPIO 7`.
- Thermocouple channel 2 GPIO lines: `GPIO 11`, `GPIO 12`, `GPIO 13`.
- Channel 2 thermocouple mapping corresponds line-for-line to channel 1 mapping (`5/8/7` -> `11/12/13`).
- Relay control (channel 2): `GPIO 9`.
- `TBD`: confirm relay control GPIO for channel 1 in this dual-channel prototype wiring doc.
- Note: these dual-channel GPIO assignments differ from the current single-channel `piNail2/config.json` runtime pins.
## Monitor Subsystem ## Monitor Subsystem
- Separate 12V power supply for the built-in monitor. - Separate 12V power supply for the built-in monitor.
- Short HDMI from Pi -> monitor. - Short HDMI from Pi -> monitor.