[Solved] Getting Arduino IDE error with Relay Actuator sketch

  • https://www.mysensors.org/build/relay

    I am attempting to use the following sketch for a relay setup but getting the error below:

     * The MySensors Arduino library handles the wireless radio link and protocol
     * between your home built sensors/actuators and HA controller of choice.
     * The sensors forms a self healing radio network with optional repeaters. Each
     * repeater and gateway builds a routing tables in EEPROM which keeps track of the
     * network topology allowing messages to be routed to nodes.
     * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
     * Copyright (C) 2013-2019 Sensnology AB
     * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
     * Documentation: http://www.mysensors.org
     * Support Forum: http://forum.mysensors.org
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License
     * version 2 as published by the Free Software Foundation.
     * Version 1.0 - Henrik Ekblad
     * Example sketch showing how to control physical relays.
     * This example will remember relay state after power failure.
     * http://www.mysensors.org/build/relay
    // Enable debug prints to serial monitor
    #define MY_DEBUG
    // Enable and select radio type attached
    #define MY_RADIO_RF24
    //#define MY_RADIO_NRF5_ESB
    //#define MY_RADIO_RFM69
    //#define MY_RADIO_RFM95
    // Enable repeater functionality for this node
    #include <MySensors.h>
    #define RELAY_PIN 4  // 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_PIN; 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_PIN; 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.getType()==V_STATUS) {
        // Change relay state
        digitalWrite(message.getSensor()-1+RELAY_PIN, message.getBool()?RELAY_ON:RELAY_OFF);
        // Store state in eeprom
        saveState(message.getSensor(), message.getBool());
        // Write some debug info
        Serial.print("Incoming change for sensor:");
        Serial.print(", New status: ");
    wifi-enabled-relay:89:23: error: 'const class MyMessage' has no member named 'getSensor'; did you mean 'setSensor'?
         saveState(message.getSensor(), message.getBool());

  • That is weird. I can't see what is wrong. Especially since it compiled the one in digitalWrite.
    I just tried pasting your code into a sketch I was working on and it verified (different board and radio, but it doesn't seem like that should matter).
    Using Arduino 1.8.9

  • Admin

    @mrhutchinsonmn Looks like your MySensors library is outdated, please update to 2.3.2

  • @tekka Looks up to date to me.

    Screenshot from 2020-03-09 07-44-29.png

  • Admin

    @mrhutchinsonmn It compiles here, can you post the entire compilation log?

  • @tekka I moved the library and reinstalled. The sketch works now. Thank you for pointing me in the right direction!

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