/**
 * 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 - epierre
 * Converted to 1.4 by Henrik Ekblad
 * 
 * DESCRIPTION
 * Arduino Dust Sensort
 *
 * connect the sensor as follows :
 * 
 *   VCC       >>> 5V
 *   A         >>> A0
 *   GND       >>> GND
 *
 * Based on: http://www.dfrobot.com/wiki/index.php/Sharp_GP2Y1010AU 
 * Authors: Cyrille Médard de Chardon (serialC), Christophe Trefois (Trefex)
 * 
 * http://www.mysensors.org/build/dust
 * 
 */

#include <MySensor.h>  
#include <SPI.h>

#define CHILD_ID_DUST 0
#define DUST_SENSOR_ANALOG_PIN 1

unsigned long SLEEP_TIME = 30*1000; // Sleep time between reads (in milliseconds)
//VARIABLES
int val = 0;           // variable to store the value coming from the sensor
float valDUST =0.0;
float lastDUST =0.0;
int samplingTime = 280;
int deltaTime = 40;
int sleepTime = 9680;
float voMeasured = 0;
float calcVoltage = 0;
float dustDensity = 0;

MySensor gw;
MyMessage dustMsg(CHILD_ID_DUST, V_LEVEL);

void setup()  
{
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Dust Sensor", "1.1");

  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_DUST, S_DUST);  
   
}

void loop()      
{    
  uint16_t voMeasured = analogRead(DUST_SENSOR_ANALOG_PIN);// Get DUST value

  // 0 - 5V mapped to 0 - 1023 integer values
  // recover voltage
  calcVoltage = voMeasured * (5.0 / 1024.0);

  // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/
  // Chris Nafis (c) 2012
  dustDensity = (0.17 * calcVoltage - 0.1)*1000;
 
  Serial.print("Raw Signal Value (0-1023): ");
  Serial.print(voMeasured);
  
  Serial.print(" - Voltage: ");
  Serial.print(calcVoltage);
  
  Serial.print(" - Dust Density: ");
  Serial.println(dustDensity); // unit: ug/m3
 
  if (ceil(dustDensity) != lastDUST) {
      gw.send(dustMsg.set((int)ceil(dustDensity)));
      lastDUST = ceil(dustDensity);
  }
 
  gw.sleep(SLEEP_TIME);
}
