## 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)


## Notes

### Using GPIO 1,3

If your device uses the GPIO pins 1 (serial0 TX) or 3 (serial0 RX)for channels,
you need to disable logging via the serial port:

```
mos config-set debug.stderr_uart=-1 debug.stdout_uart=-1
```

### Using ESP8285 or 1MB ESP8266

You need to flash with the following statement in `mos.yml`:

```
build_vars:
  FLASH_SIZE: 1048576
```

Note: OTA will not work on these devices, for lack of flash space for the
alternate boot partition.

### Using Sonoff-4CH

Sonoff 4CH uses a bunch of GPIO pins for the LEDs and pushbuttons, and as such
has no space for sensors.

```
mos config-set app.config=sonoff-4ch.json sensors.dht_gpio=""
```