arduino/examples/PM2_SIMPLE/PM2_SIMPLE.ino

/*
This is the code for the AirGradient DIY Air Quality Sensor with an ESP8266 Microcontroller.

It is a high quality sensor showing PM2.5, CO2, Temperature and Humidity on a small display and can send data over Wifi.

For build instructions please visit https://www.airgradient.com/diy/

Compatible with the following sensors:
Plantower PMS5003 (Fine Particle Sensor)

Please install ESP8266 board manager (tested with version 3.0.0)

If you have any questions please visit our forum at https://forum.airgradient.com/

If you are a school or university contact us for a free trial on the AirGradient platform.
https://www.airgradient.com/schools/

Kits with all required components are available at https://www.airgradient.com/diyshop/

MIT License
*/

#include <AirGradient.h>

AirGradient ag = AirGradient();

void setup() {
  Serial.begin(9600);
  ag.PMS_Init();
}

void loop() {

  int PM2 = ag.getPM2_Raw();

  Serial.print("PM2.5 in ug/m3: ");
  Serial.println(String(PM2));

  Serial.print("PM2.5 in US AQI: ");
  Serial.println(String(PM_TO_AQI_US(PM2)));

  delay(5000);
}

int PM_TO_AQI_US(int pm02) {
  if (pm02 <= 12.0) return ((50 - 0) / (12.0 - .0) * (pm02 - .0) + 0);
  else if (pm02 <= 35.4) return ((100 - 50) / (35.4 - 12.0) * (pm02 - 12.0) + 50);
  else if (pm02 <= 55.4) return ((150 - 100) / (55.4 - 35.4) * (pm02 - 35.4) + 100);
  else if (pm02 <= 150.4) return ((200 - 150) / (150.4 - 55.4) * (pm02 - 55.4) + 150);
  else if (pm02 <= 250.4) return ((300 - 200) / (250.4 - 150.4) * (pm02 - 150.4) + 200);
  else if (pm02 <= 350.4) return ((400 - 300) / (350.4 - 250.4) * (pm02 - 250.4) + 300);
  else if (pm02 <= 500.4) return ((500 - 400) / (500.4 - 350.4) * (pm02 - 350.4) + 400);
  else return 500;
};