int Vo = A0; 

int V_LED = 2;   

  

float Vo_value = 0;

float Voltage = 0;

float dustDensity = 0;

 

void setup(){

  Serial.begin(9600);

  pinMode(V_LED, OUTPUT);

  pinMode(Vo, INPUT);

}

 

void loop(){

  

  digitalWrite(V_LED,LOW);

  delayMicroseconds(280);

  Vo_value = analogRead(Vo); 

  delayMicroseconds(40);

  digitalWrite(V_LED,HIGH); 

  delayMicroseconds(9680);

 

  Voltage = Vo_value * 5.0 / 1023.0;

  dustDensity = (Voltage - 0.3)/0.005;

  

  Serial.print(" Volatage: ");

  Serial.println(Voltage);

  Serial.print(" Dust Density: ");

  Serial.println(dustDensity);

 

  delay(1000);

}