Dust Update Code

IT18126402/Dust_Sensor/Dust_Sensor.ino

-int measurePin = A7;              /*Connect dust sensor to Arduino Analog A7 pin*/
-int ledPower = 11;                /*LED Power Pin*/
+int measurePin = A7;                             /*Connect dust sensor to Arduino Analog A7 pin*/
+int ledPower = 11;                               /*LED Power Pin*/
 
-unsigned int samplingTime = 280;  /*the same as ints in that they store a 2 byte value*/  
-unsigned int deltaTime = 40;      /*Calculate time taken by loop.*/
-unsigned int sleepTime = 9680;    /*Pauses the program for the amount of time (in milliseconds) specified as parameter. (There are 1000 milliseconds in a second.)*/
+unsigned int samplingTime = 280;                 /*the same as ints in that they store a 2 byte value*/  
+unsigned int deltaTime = 40;                     /*Calculate time taken by loop.*/
+unsigned int sleepTime = 9680;                   /*Pauses the program for the amount of time (in milliseconds) specified as parameter. (There are 1000 milliseconds in a second.)*/
 
-float voMeasured = 0;   /*Voltage value*/
-float calcVoltage = 0;  /*Calculate Voltage*/
-float dustDensity = 0;  /*Dust Density Size*/
+float voMeasured = 0;                            /*Voltage value*/
+float calcVoltage = 0;                           /*Calculate Voltage*/
+float dustDensity = 0;                           /*Dust Density Size*/
 
 void setup() {
-  Serial.begin(9600);         /*initialize the Serial Monitor at a baud rate of 9600 for debugging purposes*/
+  Serial.begin(9600);                            /*initialize the Serial Monitor at a baud rate of 9600 for debugging purposes*/
   pinMode(ledPower,OUTPUT);
 
 }
 
 void loop() {
-  digitalWrite(ledPower,LOW);   /*turn on the IR LED*/
-  delayMicroseconds(samplingTime);  /*waiting for 0.28ms before taking a reading of the output voltage value*/
+  digitalWrite(ledPower,LOW);                    /*turn on the IR LED*/
+  delayMicroseconds(samplingTime);               /*waiting for 0.28ms before taking a reading of the output voltage value*/
 
-  voMeasured = analogRead(measurePin);  /*Read the voltage values from the analog pin*/
+  voMeasured = analogRead(measurePin);           /*Read the voltage values from the analog pin*/
 
-  delayMicroseconds(deltaTime);   /*40-microsecond delay before turning the dust sensor led off*/
-  digitalWrite(ledPower,HIGH);    /*LED should be pulsed on once every 10ms. It means LED start to blinking*/
-  delayMicroseconds(sleepTime);   /*Sleep time because 10ms cycle = 10000 - 280 - 40 = 9680 microseconds. It means this delay loop in 1 sec*/
+  delayMicroseconds(deltaTime);                  /*40-microsecond delay before turning the dust sensor led off*/
+  digitalWrite(ledPower,HIGH);                   /*LED should be pulsed on once every 10ms. It means LED start to blinking*/
+  delayMicroseconds(sleepTime);                  /*Sleep time because 10ms cycle = 10000 - 280 - 40 = 9680 microseconds. It means this delay loop in 1 sec*/
 
+  calcVoltage = voMeasured*(5.0/1024);           /* 0 - 5.0V mapped to 0 - 1023 integer values (if you use 3.3V, map 0 - 3.3V to 0 - 1023) */
+  dustDensity = 0.17*calcVoltage-0.1;            /* Using linear eqaution for calculate Dust Density*/
 }