This is a replacement firmware (Arduino IDE with ESP8266 core needed) for the ESP8266 based Sonoff devices. Use it as a starting block for customizing your Sonoff.
What's a "Sonoff"?
Sonoff is just a small ESP8266 based module, that can toggle mains power on it's output. It has everything included in a nice plastic package. See more here Sonoff manufacturer website
What can your code do for me?
The goal of this is to give you a kickstart. Using it as a starter package you should be fairly advanced on the way of making your Sonoff behave the way you want. Adding, removing features should now be trivial.
Features include (
strikethrough = not implemented yet)
- wifi credentials configuration/onboarding using WiFiManager
- web configuration portal to setup tokes, servers, ports, etc
- Blynk integration
- MQTT integration
HTTP sever API
- OTA over the air firmware update
- turn off and on relay from onboard button
and external button
If you want a more complete/complex firmware you should check out the Sonoff-MQTT-OTA-Arduino project.
First of all you will need to solder a 4 or 5 pin header on your Sonoff so you can flash the new firmware.
You will need to download any libraries included, they should all have URLs in the source code mentioned, or you can find them in the Arduino Library Manager.
After you have the header, the libraries installed and a serial to usb dongle ready, power up the module while pressing the onboard button. This should put it into programming mode.
Flash the firmware, the module should reset afterwards and the green LED should be blinking. Slow blink = connecting Fast blink = configuration portal started
Being your first run, connect to the Access Point the module created and configure it. If you don t get a configuration popup when connecting, open 192.168.4.1 in your browser.
After it's configured and connected, the green LED should stay lit, and the relay should be enabled (this is the default).
OTA should also be enabled now and you can do future updates over the air. It uses the basic ArduinoOTA available in Arduino IDE port of the ESP8266 core.
Blynk App is supported in both local server or cloud mode. Add the token and the server details in the web config portal.
MQTT has now been added
You can send messages to
deviceId/channel-0 with the following parameters:
- no parameter (blank) and the device will send it's status back
- 'on' to turn on
- 'off' to turn off
- 'toggle' to toggle between on and off
The status will come as a response on topic
Here are some posts I wrote on making all this work that you might find helpful
Part 1 - Original Sonoff Introduction
Part 2 - Original Sonoff firmware replacement
Part 3 - Sonoff POW and S20 Smart Socket Introduction
Part 4 - Sonoff S20 firmware replacement