Sonoff S20

The Sonoff S20 is a smart socket off-the-shelf product using a ESP8266 with 1MByte Flash.

Sonoff S20

Sonoff ITEAD is a brand for several off-the-shelf Smart Home WLAN devices like switches that use the ESP8266 chip.

The Minimal Example can be flashed onto his device to support a remote switch with options for time based switching.

GPIO usage

GPIO#	Component	Usage
GPIO13(D7)	LED	LED (green), (0 to switch on).
GPIO0(D3)	button	button, can also be used for start flashing
GPIO12(D6)	relay+LED	relay and LED(blue), (1 to switch on).

Warning

This warning is serious.
Stay away from devices with contact to mains voltage.
Never handle this module when connected to the mains voltage as the contacts are not safe.
Uploading firmware to devices that have contact to mains voltage is dangerous.
DO NOT connect the any device to the mains during flashing or while using the serial interface.
You may kill your computer and yourself.
When you are making these kind of projects you really need to know what you are doing.
I have warned you, do not blame on me.

Example env.json configuration

This configuration registers the device with the name “sonoff01” on the networks and enables using the button during boot for starting into the configuration mode.

{
  "device": {
    "0": {
      "name": "sonoffs20",
      "description": "Sonoff S20 plug",
      "homepage": "/ding.htm",
      "led": "D7",
      "button": "D3"
    }
  },
  "ota": {
    "0": {
      "port": 8266,
      "passwd": "123",
      "description": "Listen for 'over the air' OTA Updates"
    }
  }
}

Example config.json configuration

This configuration allows switching the relay using the button and showing the relay state using the LED.

{
  "digitalin": {
    "button": {
      "pin": "D3",
      "invert": 1,
      "pullup": 1,
      "onLow": "switch/relay?toggle=1"
    }
  },
  "switch": {
    "relay": {
      "value": 0,
      "onValue": "digitalout/relay?value=$v"
    }
  },
  "digitalout": {
    "relay": {
      "pin": "D6",
      "invert": "false"
    }
  }
}

Sonoff S20

GPIO usage

Warning

Example env.json configuration

Example config.json configuration

See also

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