ESP8266 + Radio + Relay Working Fine

  • HI Everyone,

    I noticed that I couldn't find a relay working with ESP8266MOD, I was messing with it over the last few days and figured out that the following sketch works. The big fix was in the sketch you use pin 0 for the relay and actually attach it to pin 3. This works great with WEMOS ESP8266.

    // Enable debug prints to serial monitor
    #define MY_DEBUG
    #define MY_NODE_ID 97 //esp8266relay
    // Enable and select radio type attached
    #define MY_RADIO_NRF24
    //#define MY_RADIO_RFM69

    // Enable repeater functionality for this node

    #include <MySensors.h>

    #define RELAY_1 0 // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
    #define NUMBER_OF_RELAYS 1 // Total number of attached relays
    #define RELAY_ON 1 // GPIO value to write to turn on attached relay
    #define RELAY_OFF 0 // GPIO value to write to turn off attached relay

    void before()
    for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);
    // Set relay to last known state (using eeprom storage)
    digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);

    void setup()


    void presentation()
    // Send the sketch version information to the gateway and Controller
    sendSketchInfo("Relay", "1.0");

    for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
    	// Register all sensors to gw (they will be created as child devices)
    	present(sensor, S_BINARY);


    void loop()


    void receive(const MyMessage &message)
    // We only expect one type of message from controller. But we better check anyway.
    if (message.type==V_STATUS) {
    // Change relay state
    digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
    // Store state in eeprom
    saveState(message.sensor, message.getBool());
    // Write some debug info
    Serial.print("Incoming change for sensor:");
    Serial.print(", New status: ");

  • Mod

    @Newzwaver I think that makes sense. D3 on Wemos D1 Minis is GPIO0. I usually use the Dn notation, because I find it easier to understand.

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