DIY Dust Detector with Arduino: A Comprehensive Guide

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Put together a Arduino-based dust sensor over the weekend using the following components:

Arduino Mega 2560
Shinyei PPD42NS dust sensor
LCD Shield (16 x 2)

The codes and wiring instructions for Arduino Mega 2560 and Shinyei PPD42NS is as follow. However, I did include Serial output so you can view the sampling results using Arduino IDE’s Serial Monitor (9600 bauds).

#include <LiquidCrystal.h>

LiquidCrystal lcd(8, 13, 9, 4, 5, 6, 7);

byte nano[8] = {B00000,B00000,B00000,B10010,B10010,B10010,B11110,B10000};

byte pow3[8] = {B11000,B00100,B11000,B00100,B11000,B00000,B00000,B00000};

#include <avr/wdt.h>

#define PM25 0

#define PM10 1

int pin[] = {50,51};

unsigned long starttime;

unsigned long sampletime_ms = 30000;

unsigned long triggerOn[2];

unsigned long triggerOff[2];

unsigned long lowpulseoccupancy[] = {0,0};

float ratio[] = {0,0};

float count[] = {0,0};

boolean value[] = {HIGH,HIGH};

boolean trigger[] = {false, false};

void setup()

{

lcd.createChar(0,nano);

lcd.createChar(1,pow3);

lcd.begin(16, 2);

Serial.begin(9600); //Output to Serial at 9600 baud

pinMode(pin[PM25],INPUT); //Listen at the designated PIN

wdt_enable(WDTO_8S);

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

}

void loop()

{

value[PM25] = digitalRead(pin[PM25]);

value[PM10] = digitalRead(pin[PM10]);

Put together a dust sensor using Arduino Mega 2560, Shinyei PPD42NS dust sensor and LCD shield.

if(value[PM25] == LOW && trigger[PM25] == false) {

trigger[PM25] = true;

triggerOn[PM25] = micros();

}

if(value[PM25] == HIGH && trigger[PM25] == true) {

triggerOff[PM25] = micros();

lowpulseoccupancy[PM25] += (triggerOff[PM25] – triggerOn[PM25]);

trigger[PM25] = false;

}

if(value[PM10] == LOW && trigger[PM10] == false) {

trigger[PM10] = true;

triggerOn[PM10] = micros();

}

if(value[PM10] == HIGH && trigger[PM10] == true) {

triggerOff[PM10] = micros();

lowpulseoccupancy[PM10] += (triggerOff[PM10] – triggerOn[PM10]);

trigger[PM10] = false;

}

wdt_reset();

if ((millis()–starttime) > sampletime_ms)//Checking if it is time to sample

{

For more detail:Arduino Dust Sensor

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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