/*!
 * @file  SEN0144.ino
 * @brief Standalone Sketch to use with a Arduino UNO and a
 * @n Sharp Optical Dust Sensor GP2Y1010AU0F
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  DFRobot
 * @version  V3.0
 * @date  2023-08-03
 */

/**user define**/
int voutPin = A0;  //Connect Vo of dust sensor Vo to Arduino A0 pin
int ledPin = 2;    //Connect LED(3pin) of dust sensor to Arduino D2 pin

/**system define**/
int samplingTime = 280;
int deltaTime = 40;
int sleepTime = 9680;
int voMeasured = 0;
float calcVoltage = 0;
float dustDensity = 0;


void setup()
{
  Serial.begin(9600);
  pinMode(ledPin,OUTPUT);
}


void loop()
{
  digitalWrite(ledPin,LOW); // power on the LED
  delayMicroseconds(samplingTime);

  voMeasured = analogRead(voutPin); // read the dust value

  delayMicroseconds(deltaTime);
  digitalWrite(ledPin,HIGH); // turn the LED off
  delayMicroseconds(sleepTime);

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

  // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/
  // Chris Nafis (c) 2012
  if ( calcVoltage >= 0.6 ) {
      dustDensity = 0.17 * calcVoltage - 0.1;
  } else {
      dustDensity = 0;
  }

  Serial.print("Raw Signal Value (0-1023): ");
  Serial.print(voMeasured);

  Serial.print(" - Voltage: ");
  Serial.print(calcVoltage);
  Serial.print("V");

  Serial.print(" - Dust Density: ");

  if( calcVoltage > 3.5 ) {
     Serial.print(">");  // unit: mg/m3
  }

  Serial.print(dustDensity);
  Serial.println(" mg/m3");

  delay(1000);
}