Basic question: Light sensors



  • V_LIGHT_LEVEL; does home-assistant support the SI unit LUX? I have a sketch for a LUX sensor I am trying to integrate into HA but it gives a value back in % in the GUI.

    Thanks,


  • Plugin Developer

    V_LIGHT_LEVEL should have the unit percent (%) according to the mysensors serial API. For lux use V_LEVEL and a custom unit of measurement, V_UNIT_PREFIX. Read more here:
    https://home-assistant.io/components/sensor.mysensors/#custom-unit-of-measurement

    See the example sketch here:
    https://home-assistant.io/components/sensor.mysensors/#example-sketch



  • @martinhjelmare

    Thanks martin. I think I got the code handled properly, but i'm getting a compile error.

    /**
     * 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) 2013-2015 Sensnology AB
     * Full contributor list: https://github.com/mysensors/Arduino/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.
     *
     *******************************
     *
     * REVISION HISTORY
     * Version 1.0 - Derrick Rockwell (@Drock1985)
     * 
     * DESCRIPTION
     * 
     *
     */
    
    // Enable debug prints
    #define MY_DEBUG
    
    // Enable and select radio type attached
    #define MY_RADIO_NRF24
    //#define MY_RADIO_RFM69
    #define MY_NODE_ID 21
    #define MY_REPEATER_FEATURE //Enables Repeater feature for non-battery powered nodes. 
    #include <SPI.h>
    #include <MySensors.h>
    #include <DallasTemperature.h>
    #include <OneWire.h>
    #include <BH1750.h>
    #include <Wire.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 COMPARE_TEMP 1 // Send temperature only if changed? 1 = Yes 0 = No
    #define ONE_WIRE_BUS 4 // Pin where dallase sensor is connected 
    OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
    DallasTemperature sensors(&oneWire); // Pass the oneWire reference to Dallas Temperature. 
    int lastTemperature = 0;
    boolean receivedConfig = false;
    boolean metric = true;
    
    
    #define CHILD_ID_MOTION 1   // Id of the sensor child
    #define CHILD_ID_TEMP 2   // ID of Temperature Sensor
    #define CHILD_ID_LUX 3  // ID of Lux Sensor
    
    BH1750 lightSensor;
    
    // Initialize  messages
    MyMessage msgMotion(CHILD_ID_MOTION, V_TRIPPED);
    MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
    MyMessage msgLux(CHILD_ID_LUX, V_LEVEL); //Sets up custom units (this case LUX for Light)
    MyMessage msgPrefix(CHILD_ID_LUX, V_UNIT_PREFIX); // Sends controller the LUX value instead of %
    
    uint16_t lastlux = 0;
    
    void setup()  
    {  
      pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
      lightSensor.begin();
      // Startup up the OneWire library
      sensors.begin();
      // requestTemperatures() will not block current thread
     sensors.setWaitForConversion(false);
      send(msgPrefix.set("Lux"));
      
    }
    
    void presentation()  {
      // Send the sketch version information to the gateway and Controller
      sendSketchInfo("LuxMotionTempSensor", "1.0");
    
      // Register all sensors to gw (they will be created as child devices)
      present(CHILD_ID_MOTION, S_MOTION);
      present(CHILD_ID_TEMP, S_TEMP);
      present(CHILD_ID_LUX, S_LIGHT_LEVEL);
    }
    
    void loop()     
    {     
     {     
      uint16_t lux = lightSensor.readLightLevel();// Get Lux value
      Serial.println(lux);
      if (lux != lastlux) {
          send(msgLux.set(lux));
          send(msgPrefix.set("Lux"));
          lastlux = lux;
      }}
    
       // Fetch temperatures from Dallas sensors
      sensors.requestTemperatures();
    
    
        // Fetch and round temperature to one decimal
        int temperature = (((sensors.getTempCByIndex(0)) * 10.)) / 10.;
        #if COMPARE_TEMP == 1
        if (lastTemperature != temperature && temperature != -127.00 && temperature != 85.00) {
        #else
        if (temperature != -127.00 && temperature != 85.00) {
        #endif
          // Send in the new temperature
          send(msgTemp.set(temperature,1));
          // Save new temperatures for next compare
          lastTemperature = temperature;
        }}
        // Read digital motion value
      boolean tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; 
            
    //  Serial.println(tripped);
      send(msgMotion(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);
    }
    
    

    I'll try it again tomorrow.

    Thank you again for pointing me in the right direction on custom units.


Log in to reply
 

283
Online

6.7k
Users

7.6k
Topics

80.4k
Posts

Looks like your connection to MySensors Forum was lost, please wait while we try to reconnect.