This week I bought a set of radio controlled power outlets. My plan is to use Home Assistant (Python, Open Source) to control the power outlets. For that to work I need to find the codes that are used by the remote control's 433 Mhz radio transmitter to switch the power ON and OFF (each power outlet has two codes).

First I connect the 433 Mhz receiver to my Wemos D1 (ESP8266). I use the Wemos since it is still installed on my experiment board (after I found out the codes I do not need this setup any more).

RF receiver connected to Wemos D1

Arduino Sketch

I like to use the Arduino IDE to write/ upload ESP8266 firmware.

/*
  Simple RF receiver based on

  https://github.com/sui77/rc-switch/
*/

#include "RCSwitch.h"

RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(115200);
  mySwitch.enableReceive(13);  // Receiver on interrupt GPio 13 => that is pin D7 
  Serial.println("ESP8266 RF receiver scanning now...");
}

void loop() {
  if (mySwitch.available()) {

    int value = mySwitch.getReceivedValue();

    if (value == 0) {
      Serial.print("Unknown encoding");
    } else {
      Serial.print("Received ");
      Serial.print( mySwitch.getReceivedValue() );
      Serial.print(" / ");
      Serial.print( mySwitch.getReceivedBitlength() );
      Serial.print("bit ");
      Serial.print("Protocol: ");
      Serial.println( mySwitch.getReceivedProtocol() );
    }

    mySwitch.resetAvailable();
  }
}

Reading the codes

Once the code is uploaded to the ESP8266 it writes to the serial interface with 115200 baud. I press the different buttons on the remote control and in the Serial Monitor I see the related codes.

ESP8266 RF receiver scanning now...
Received 1234567 / 24bit Protocol: 1
Received 1234568 / 24bit Protocol: 1
Received 1234568 / 24bit Protocol: 1

I filled a spreadsheet with all ON / OFF codes for all my 5 power outlets. With these codes I am prepared to connect more devices to Home Assistant.

Power outlet and remote control

I hope this article proves helpful to you... Mark

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