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firmware: migrate cargo controller to LilyGO T-Relay S3

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nick
2026-06-29 22:57:02 -06:00
parent 406033bec8
commit 4cbd2165b2
10 changed files with 127 additions and 95 deletions
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docs/HARDWARE.md
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@@ -239,3 +239,30 @@ Important guardrails:
## M9N GPS Module
The dashboard enclosure will include an M9N GPS module connected to the ESP32-S3 dashboard over UART. It will provide GPS fix status, satellite count, position, speed, and UTC time. Future work will use GPS time/location for automatic timezone and DST handling.
### LilyGO T-Relay-S3 6-relay cargo controller
The cargo ESP now targets the LilyGO T-Relay-S3 6-relay board.
Relay control is handled through the onboard 74HC595 shift register, not direct ESP32 GPIO relay outputs.
| Function | GPIO |
| --- | --- |
| 74HC595 DATA | GPIO7 |
| 74HC595 CLOCK | GPIO5 |
| 74HC595 LATCH | GPIO6 |
| 74HC595 nOE | GPIO4 |
| Firmware ID | LilyGO relay channel | Shift-register output |
| --- | --- | --- |
| relay_1 | CH1 | SR1 |
| relay_2 | CH2 | SR2 |
| relay_3 | CH3 | SR3 |
| relay_4 | CH4 | SR4 |
| relay_5 | CH5 | SR5 |
| relay_6 | CH6 | SR6 |
GPIO4 is reserved for relay output-enable on this board, so the DS18B20 OneWire bus is moved to GPIO14.
Avoid GPIO35-GPIO37 on the LilyGO T-Relay-S3 because they are used by Octal SPI flash.