Microdust index scale

we made a machine that showed the level of find dust

IntermediateFull instructions provided16 hours106

Things used in this project

Hardware components

Arduino Nano R3

Renaissance Robotics JST Jumper Bundle for the BeagleBone Blue

Seeed Studio Grove - Dust Sensor（PPD42NS）

5 mm LED: Red

Adafruit RGB Backlight LCD - 16x2

Story

These days, fine dust is serious. The school thought that students should make fine dust alarms because it is a place where they usually live. So we made a fine dust alarm. This fine dust alarm shows the level of fine dust, and low levels indicate blue, green, and red. Install the sensor outside of this fine dust alarm and place the indicator inside. When the indicator turns red, you can close the window. We used the Arduino for the first time. So I was very proud after finishing. If I have a chance next time, I would like to make a better work.

dust sensor

#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <LCD.h>


#define I2C_ADDR          0x27        
#define BACKLIGHT_PIN      3
#define En_pin             2
#define Rw_pin             1
#define Rs_pin             0
#define D4_pin             4
#define D5_pin             5
#define D6_pin             6
#define D7_pin             7


LiquidCrystal_I2C      lcd(I2C_ADDR, En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

int dustPin=0;
float dustVal=0;
float dustDensity = 0;

int ledPower=2;
int delayTime=280;
int delayTime2=40;
float offTime=9680;

void setup(){
  Serial.begin(9600);
  pinMode(ledPower,OUTPUT);
  pinMode(4, OUTPUT);
  lcd.begin (16,2);
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
}
 
void loop(){
  digitalWrite(ledPower,LOW); // power on the LED
  delayMicroseconds(delayTime);

  dustVal=analogRead(dustPin); // read the dust value via pin 5 on the sensor
  delayMicroseconds(delayTime2);

  digitalWrite(ledPower,HIGH); // turn the LED off
  delayMicroseconds(offTime);
 
  delay(3000);

  dustDensity = 0.17*(dustVal*0.0049)-0.1;
  Serial.print("Dust density(mg/m3) = ");
  Serial.println(dustDensity);

  lcd.setCursor(0,0);
  lcd.print("Fine Dust Density : ");
  lcd.print(dustDensity);
  lcd.print("mg/m3");

}