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| GPIO | Description |
|---|---|
| 0 | Button |
| 1 | Serial Rx and Optional Sensor |
| 3 | Serial Tx and Optional Sensor |
| 4 | Optional Sensor on Top Header |
| 5 | Optional Sensor on Top Header |
| 12 | Relay and Red LED |
| 13 | Green LED |
| 14 | Optional Sensor on Top Header |
Flashing Sonoff using Arduino IDE
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