My FYP: *4 WEEK : SHINYEI Particle Sensor Coding

Now, it time for Particle Sensor. Same as DHT11, i had search the related coding for this sensor. i had found some of the coding. Such like;

Grove - Dust Sensor Demo v1.0

Interface to Shinyei Model PPD42NS Particle Sensor

Program by Christopher Nafis

Written April 2012

http://www.seeedstudio.com/depot/grove-dust-sensor-p-1050.html

http://www.sca-shinyei.com/pdf/PPD42NS.pdf

JST Pin 1 (Black Wire) => //Arduino GND

JST Pin 3 (Red wire) => //Arduino 5VDC

JST Pin 4 (Yellow wire) => //Arduino Digital Pin 8

int pin = 8;

unsigned long duration;

unsigned long starttime;

unsigned long sampletime_ms = 2000;//sampe 30s ;

unsigned long lowpulseoccupancy = 0;

float ratio = 0;

float concentration = 0;

void setup() {

Serial.begin(9600);

pinMode(8,INPUT);

starttime = millis();//get the current time;

}

void loop() {

duration = pulseIn(pin, LOW);

lowpulseoccupancy = lowpulseoccupancy+duration;

if ((millis()-starttime) >= sampletime_ms)//if the sampel time = = 30s

{

ratio = lowpulseoccupancy/(sampletime_ms*10.0); // Integer percentage 0=>100

concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve

Serial.print("concentration = ");

Serial.print(concentration);

Serial.println(" pcs/0.01cf");

Serial.println("\n");

lowpulseoccupancy = 0;

starttime = millis();

}

By using this coding, i try to build the circuit of this particle sensor, this is the reading on the Serial Monitor of Arduino.

Insyaallah i will modified the output of the program, so that it is easier for user to understand the reading. There is another program that i had found;