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The S20, TH, Basic and SV all share the same 1-channel pinout. The 4CH has a few more IO pins.
GPIO for 3-gang
- 0: Top green LED
- 16: Top blue LED
- 14: Middle blue LED
- 2: Bottom blue LED
- 12: Top button
- 3: Middle button
- 5: Bottom button
- 13: Top relay (L1)
- 4: Middle relay (L2)
- 15: Bottom relay (L3)