Basic project setup from start to finish

  • Is there a place that explains how to set up a project from start to finish? I am a complete newbie to IOT. I am looking for instructions on how to start a project like the temperature sensor. What are the first steps? Do I create a directory in the examples folder and clone the library I need into that directory then add the dependencies? I need complete hand holding and I have not been able to find it. Thanks in advance!!!

  • Mod

    @toddsantoro great that you are joining the world of IoT, welcome to the MySensors community.

    The step by step guide starts here:

  • Thank you this was just what I was looking for. Cheers!!!

  • Mod

    @toddsantoro you're welcome. Just ask if you get stuck and we'll help you get back on track.

  • @mfalkvidd I'm stuck again... I wired up the motion sensor and compiled the code on the motion sensor page. It pushed everything to the Nano but I get this: Sketch uses 7,500 bytes (24%) of program storage space. Maximum is 30,720 bytes.
    Global variables use 371 bytes (18%) of dynamic memory, leaving 1,677 bytes for local variables. Maximum is 2,048 bytes.
    Invalid library found in /Users/xyz/Documents/Arduino/libraries/TAS_motion_sensor: /Users/xyz/Documents/Arduino/libraries/TAS_motion_sensor
    Invalid library found in /Users/xyz/Documents/Arduino/libraries/TAS_motion_sensor: /Users/xyz/Documents/Arduino/libraries/TAS_motion_sensor

    TAS_motion_sensor is my project folder and the ino file is also named that. WHat am I missing??? DO I need to add the serial gateway stuff to the Nano that has the motion sensor attached to it? I am also using the 3.3v for the radio and the 5v for the motion sensor and I am also using the 2 different grounds provided on the board too. Any help would get me past this first sensor and then I think I will be off to the races.

  • Hero Member

    @toddsantoro From first glance.. you should not put your sketch in the libraries folder but in the sketches folder. Next time please publish the sketch (insert with the "</>" markt in de format menu)

  • Should I create another folder in there called sketches? Here is my sketch copy and pasted from the example on this page:

     * 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 <>
     * Copyright (C) 2013-2015 Sensnology AB
     * Full contributor list:
     * Documentation:
     * Support Forum:
     * 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
     * Motion Sensor example using HC-SR501 
    // Enable debug prints
    // #define MY_DEBUG
    // Enable and select radio type attached
    #define MY_RADIO_NRF24
    //#define MY_RADIO_RFM69
    #include <MySensors.h>
    unsigned long SLEEP_TIME = 120000; // Sleep time between reports (in milliseconds)
    #define DIGITAL_INPUT_SENSOR 3   // The digital input you attached your motion sensor.  (Only 2 and 3 generates interrupt!)
    #define CHILD_ID 1   // Id of the sensor child
    // Initialize motion message
    MyMessage msg(CHILD_ID, V_TRIPPED);
    void setup()  
      pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
    void presentation()  {
      // Send the sketch version information to the gateway and Controller
      sendSketchInfo("Motion Sensor", "1.0");
      // Register all sensors to gw (they will be created as child devices)
      present(CHILD_ID, S_MOTION);
    void loop()     
      // Read digital motion value
      bool tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH;
      send(msg.set(tripped?"1":"0"));  // Send tripped value to gw 
      // Sleep until interrupt comes in on motion sensor. Send update every two minute.
      sleep(digitalPinToInterrupt(DIGITAL_INPUT_SENSOR), CHANGE, SLEEP_TIME);

  • Mod

    @toddsantoro something in the Arduino IDE is referencing libraries/TAS_motion_sensor. Do you have any idea what it could be? As AWI said, nothing should expect TAS_motion_sensor to be in the libraries folder.

  • Mod

    @toddsantoro where did you paste the example sketch? What is the file name and in which folder is that file? (use Sketch->Show sketch folder (ctrk/cmd+K) to locate it)

  • @mfalkvidd I removed everything I have done and started new so that is why you do not see that in the library's folder. I would like to know the exact steps no matter how trivial they are to setting up the sensors project. I am a web programmer and that may be my issue because I know how I would set things up but that does not mean thaty are correct in this situation.

  • Mod

    @toddsantoro the instructions are available at
    After installing the library you can open the examples from File->Examples->MySensors. There is no need to copy-paste from the build page (but that should work as well).

  • @mfalkvidd OK. I will give it a try. Thanks for your help and patience. I hope to automate my whole 417 sqft home and then help others to do the same.

  • @toddsantoro Actually I have read that and I am still in the dark. From the Arduino GUI I go FILE > NEW. COMMAND + S and save it where? It defaults to the Arduino folder on my machine with just Libraries directory in it. Do I create a SKETCHES folder and save the project there? I just don't know what to do???

  • Mod

    @toddsantoro save it in the suggested directory, next to (not inside) the libraries folder.

  • @mfalkvidd ok... what goes in the file? Copy paste from the example of do I somehow use the motion sensor library? I want to get a basic, best practices work flow going. Again thanks for your help.

  • Mod

    @toddsantoro170 using the example file without modification is usually the best way to start.

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