Basic question: Light sensors

[drock1985]

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,

[martinhjelmare]

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

[drock1985]

@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.