Arduino - PM2.5 Sensor

ESP8266 Oct 4, 2020

This tutorial goes over how to use the Plantower PMS7003 PM2.5 Sensor 💨!

(1) PM2.5 Sensor (Plantower PMS7003)
(1) G7 Switch Adapter
(11) Jumper wires
(1) ESP8266 Wi-Fi Microcontroller (NodeMCU v3)

For refrence I have included the pinout diagram for the ESP8266 Wi-Fi Microcontroller (NodeMCU v3) that I am using.

ESP8266 Wi-Fi Microcontroller (NodeMCU V3) Pinouts

Setup

Code

For this project, we are using the following libraries:

Adafruit_GFX
Adafruit_ILI9341
Adafruit_PM25AQI

For information on how to install the libraries above please visist https://www.arduino.cc/en/guide/libraries.

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include "Adafruit_PM25AQI.h"

#define TFT_DC  5 // D1
#define TFT_RST 0 // D3
#define TFT_CS  4 // D2

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

#include <SoftwareSerial.h>
SoftwareSerial pmSerial(2, 3);

Adafruit_PM25AQI aqi = Adafruit_PM25AQI();

#define pmsDataLen 32
uint8_t buf[pmsDataLen];
int idx = 0;
int pm10 = 0;
int last_pm25 = 0;
int pm25 = 0;
int pm100 = 0;

uint16_t pm25color[] = {
  0x9FF3,
  0x37E0,
  0x3660,
  0xFFE0,
  0xFE60,
  0xFCC0,
  0xFB2C,
  0xF800,
  0x9800,
  0xC99F
};

void setup() {
  Serial.begin(115200);
  while (!Serial) delay(10);

  // Wait one second for sensor to boot up!
  delay(1000);

  pmSerial.begin(9600);

  if (! aqi.begin_UART(&pmSerial)) {
    Serial.println("Could not find PM 2.5 sensor!");
    while (1) delay(10);
  }

  Serial.println("PM25 found!");

  tft.begin();
  drawPictureFrames();
}

void loop() {
  PM25_AQI_Data data;

  if (! aqi.read(&data)) {
    Serial.println("Could not read from AQI");
    delay(500); // try again in a bit!
    return;
  }

  // This is used for debugging purposes and to show what additional data could potentially be rendered
  Serial.println(F("---------------------------------------"));
  Serial.println(F("Concentration Units (standard)"));
  Serial.println(F("---------------------------------------"));
  Serial.print(F("PM 1.0: ")); Serial.print(data.pm10_standard);
  Serial.print(F("\t\tPM 2.5: ")); Serial.print(data.pm25_standard);
  Serial.print(F("\t\tPM 10: ")); Serial.println(data.pm100_standard);
  Serial.println(F("Concentration Units (environmental)"));
  Serial.println(F("---------------------------------------"));
  Serial.print(F("PM 1.0: ")); Serial.print(data.pm10_env);
  Serial.print(F("\t\tPM 2.5: ")); Serial.print(data.pm25_env);
  Serial.print(F("\t\tPM 10: ")); Serial.println(data.pm100_env);
  Serial.println(F("---------------------------------------"));
  Serial.print(F("Particles > 0.3um / 0.1L air:")); Serial.println(data.particles_03um);
  Serial.print(F("Particles > 0.5um / 0.1L air:")); Serial.println(data.particles_05um);
  Serial.print(F("Particles > 1.0um / 0.1L air:")); Serial.println(data.particles_10um);
  Serial.print(F("Particles > 2.5um / 0.1L air:")); Serial.println(data.particles_25um);
  Serial.print(F("Particles > 5.0um / 0.1L air:")); Serial.println(data.particles_50um);
  Serial.print(F("Particles > 50 um / 0.1L air:")); Serial.println(data.particles_100um);
  Serial.println(F("---------------------------------------"));

  pm10 = data.pm10_standard;
  last_pm25 = pm25;
  pm25 = data.pm25_standard;
  pm100 = data.pm100_standard;

  updateValueToTftScreen();
}

void drawPictureFrames() {
  tft.setRotation(1);
  tft.fillScreen(ILI9341_BLACK);

  tft.setTextSize(1);

  // Upper title
  tft.setTextSize(1);
  tft.setCursor(20, 20);
  tft.print("PM2.5 DETECTOR");

  // PM 2.5 Circle Frame
  tft.drawCircle(100, 130, 60, ILI9341_BLUE);
  tft.drawCircle(100, 130, 61, ILI9341_BLUE);

  tft.setTextSize(1);
  tft.setCursor(90, 85);
  tft.print("PM2.5");

  tft.setTextSize(1);
  tft.setCursor(90, 170);
  tft.print("um/m3");

  // PM 10 Circle Frame
  tft.drawCircle(220, 70, 40, ILI9341_BLUE);

  tft.setTextSize(1);
  tft.setCursor(210, 40);
  tft.print("PM10");

  tft.setTextSize(1);
  tft.setCursor(205, 95);
  tft.print("um/m3");

  // PM 1.0 Circle Frame
  tft.drawCircle(220, 170, 40, ILI9341_BLUE);

  tft.setTextSize(1);
  tft.setCursor(205, 140);
  tft.print("PM1.0");

  tft.setTextSize(1);
  tft.setCursor(205, 195);
  tft.print("um/m3");

  tft.fillRect(290, 30 + 0 * 2, 10, 12 * 2, pm25color[0]); // 0~11
  tft.fillRect(290, 30 + 12 * 2, 10, 12 * 2, pm25color[1]); // 12-23
  tft.fillRect(290, 30 + 24 * 2, 10, 12 * 2, pm25color[2]); // 24-35
  tft.fillRect(290, 30 + 36 * 2, 10,  6 * 2, pm25color[3]); // 36-41
  tft.fillRect(290, 30 + 42 * 2, 10,  6 * 2, pm25color[4]); // 42-47
  tft.fillRect(290, 30 + 48 * 2, 10,  6 * 2, pm25color[5]); // 48-53
  tft.fillRect(290, 30 + 54 * 2, 10,  6 * 2, pm25color[6]); // 54-58
  tft.fillRect(290, 30 + 59 * 2, 10,  6 * 2, pm25color[7]); // 59-64
  tft.fillRect(290, 30 + 65 * 2, 10,  6 * 2, pm25color[8]); // 65-70
  tft.fillRect(290, 30 + 71 * 2, 10, 10 * 2, pm25color[9]); // >=71

  tft.setCursor(302, 30);
  tft.setTextSize(1);
  tft.print("0");
  tft.setCursor(302, 30 + 36 * 2);
  tft.print("36");
  tft.setCursor(302, 30 + 54 * 2);
  tft.print("54");
  tft.setCursor(302, 30 + 71 * 2);
  tft.print("71");

  updateValueToTftScreen();
}

void updateValueToTftScreen() {
  tft.setCursor(60, 111);
  tft.setTextSize(5);
  tft.setTextColor(getPm25Color(pm25), ILI9341_BLACK);
  if (pm25 < 10) {
    tft.print("  ");
  } else if (pm25 < 100) {
    tft.print(" ");
  }
  tft.print(pm25);

  tft.setCursor(195, 60);
  tft.setTextSize(3);
  if (pm100 < 10) {
    tft.print("  ");
  } else if (pm100 < 100) {
    tft.print(" ");
  }
  tft.print(pm100);

  tft.setCursor(198, 160);
  if (pm10 < 10) {
    tft.print("  ");
  } else if (pm10 < 100) {
    tft.print(" ");
  }
  tft.print(pm10);

  tft.setTextSize(1);
  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
  if (last_pm25 > 80) {
    tft.fillRect(275, 80 * 2 + 30 - 3, 12, 8, ILI9341_BLACK);
  } else {
    tft.fillRect(275, last_pm25 * 2 + 30 - 3, 12, 8, ILI9341_BLACK);
  }
  if (pm25 > 80) {
    tft.setCursor(275, 80 * 2 + 30 - 3);
  } else {
    tft.setCursor(275, pm25 * 2 + 30 - 3);
  }
  tft.print("=>");
}

uint16_t getPm25Color(int v) {
  if (v < 12) {
    return pm25color[0];
  } else if (v < 24) {
    return pm25color[1];
  } else if (v < 36) {
    return pm25color[2];
  } else if (v < 42) {
    return pm25color[3];
  } else if (v < 48) {
    return pm25color[4];
  } else if (v < 54) {
    return pm25color[5];
  } else if (v < 59) {
    return pm25color[6];
  } else if (v < 65) {
    return pm25color[7];
  } else if (v < 71) {
    return pm25color[8];
  } else {
    return pm25color[9];
  }
}