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Adding infrared emitter to SONOFF RF BRIDGE

With the add of  SONOFF RF Bridge  to the OpenMQTTGateway compatibility list we were able to send and receive 433mhz by MQTT. 
The interesting thing with OpenMQTTGateway is the ability to have on one board several gateways (RF, IR, BLE and more to come ;-). 

The last versions of SONOFF RF BRIDGE as two IO free pins, why not using these pins to add a new gateway to this little cheap device and control more devices.

If we follow the interest of the different gateways you are more interested on RF and after comes IR infrared.

My choice came in this case to add an infrared emitter to the RF Bridge, with this gateway we are adding the capacity of controlling TV, DVD, hifi...

On the hardware side, I followed the same schematic for IR setup with ESP8266 with just a little add a protection resistor of 1K for the IR led.
The other resistor is connected between the transistor base and IO5 of the RF Bridge instead of D0.
The IR led is powered by the 3,3V of the Sonoff RF Bridge.

The schema:

Here is how it looks like on the breadboard:

On the software side I uploaded OpenMQTTGateway with the following config:
#ifdef ESP8266 // for nodemcu, weemos and esp8266
  //#define ZgatewayRF
  //#include "config_RF.h"
  //#define ZgatewayRF2
  #define ZgatewaySRFB
  #include "config_SRFB.h"
  #define ZgatewayIR
  #include "config_IR.h"
  //#define ZgatewayBT
  //#include "config_BT.h"
  //#define ZsensorINA226

#ifdef ESP8266
  #define IR_RECEIVER_PIN 4
  #define IR_EMITTER_PIN 5

I tried to go down the volume of my TV with:
mosquitto_pub -t home/commands/IR_NEC -m 551534655

And you know what, it worked directly! Of course I'm also able to receive and send RF.

I integrated the components in the shelf and now I have a <12€ RF IR gateway !!!

Thanks SONOFF for the RF Bridge disposal.

If interested you can buy it from banggood here (affiliated link)


  1. Hi, do you think possible to add 868Mhz receiver/emitter on the sonoff RF bridge ?
    When I see 433Mhz examples it seems possible to have 868MHZ emitter and receiver with only two IO free pins ?
    I see that RFM69 is supported by OpenMQTTGateway but it require too much GPIO I think. Is there another 868mhz devices that could be connected to the two free pins of the sonoff ?

    Thank you for this great project !

    1. Hello,

      Yes it should be possible to add an emitter and a receiver at 868mhz. And make it a 433mhz/868mhz dual frequencies device.

    2. Do you have any advice about the module to use and the associated Zgatewayxx to activate in the User_config.h ?
      Or is it more complex than that ?

    3. May be it would be easier to solder additional GPIO directly on the chip to get RFM69 working on it ?


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