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Air Quality Monitoring System – ESP32 + Blynk IoT Project

Abhishek Singh
Air Quality Monitoring System Project

Air Quality Monitoring System Project

Creating project like air quality monitoring system is a great way to keep track of environmental conditions in your area. This article will help you through the steps of setting up a system using the XIAO ESP32C6 board, various sensors, and the Blynk IoT platform. Here’s a detailed breakdown of the components and steps involved. Here we have used ESP32C6 you can use other variant of ESP32 by doing required changes in the program.

Here we are including humidity and temperature parameters you can add other parameters like pressure, wind speed etc. if you want.

Watch this video for better understanding:

Air Quality Monitoring System with XIAO ESP32 C6 and Blynk IoT

Components Required:

  1. XIAO ESP32C6 board
  2. MQ135 Air Quality Sensor
  3. DHD11 Temperature and Humidity Sensor
  4. LCD Display with I2C Converter
  5. Breadboard
  6. Connecting Cables and Wires

Instructions to setup Air Quality Monitoring System:

1. Hardware Setup

Air Quality Monitoring System Project ESP & Blynk
Air Quality Monitoring System Project

2. Blynk IoT Configuration

3. Setting Up Data Streams

4. Configuring Web Dashboard

5. Setting Up Events and Notifications

6. Device Setup

7. Programming the ESP32

Code for Air Quality Monitoring System Project:

#define BLYNK_TEMPLATE_ID "Your_Temp_ID"
#define BLYNK_TEMPLATE_NAME "Air Quality Monitoring"
#define BLYNK_AUTH_TOKEN "Your_Auth_Token"

#define BLYNK_PRINT Serial
#include <WiFi.h> 
#include <BlynkSimpleEsp32.h>

#include <DHT.h>

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

byte degree_symbol[8] = 
{
0b00111,
0b00101,
0b00111,
0b00000,
0b00000,
0b00000,
0b00000,
0b00000
};

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "WiFi Username"; // type your wifi name
char pass[] = "WiFi Password"; // type your wifi password

BlynkTimer timer;

#define gas A0
int sensorThreshold = 100;

#define DHTPIN D2 //Connect Out pin to D2 in NODE MCU
#define DHTTYPE DHT11 
DHT dht(DHTPIN, DHTTYPE);


void sendSensor()
{


float h = dht.readHumidity();
float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit


if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
int analogSensor = analogRead(gas);
Blynk.virtualWrite(V2, analogSensor);
Serial.print("Gas Value: ");
Serial.println(analogSensor);
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V0, t);
Blynk.virtualWrite(V1, h);

Serial.print("Temperature : ");
Serial.print(t);
Serial.print(" Humidity : ");
Serial.println(h);


}
void setup()
{ 

Serial.begin(115200);

//pinMode(gas, INPUT);
Blynk.begin(auth, ssid, pass);
dht.begin();
timer.setInterval(30000L, sendSensor);

//Wire.begin();
lcd.begin();


// lcd.backlight();
// lcd.clear();
lcd.setCursor(3,0);
lcd.print("Air Quality");
lcd.setCursor(3,1);
lcd.print("Monitoring");
delay(2000);
lcd.clear();
}

void loop()
{
Blynk.run();
timer.run();
float h = dht.readHumidity();
float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
int gasValue = analogRead(gas);
lcd.setCursor(0,0);
lcd.print("Temperature "); 
lcd.setCursor(0,1);
lcd.print(t);
lcd.setCursor(6,1);
lcd.write(1);
lcd.createChar(1, degree_symbol);
lcd.setCursor(7,1);
lcd.print("C");
delay(4000);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Humidity ");
lcd.print(h);
lcd.print("%");
delay(4000);
lcd.clear();
//lcd.setCursor(0,0);
// lcd.print(gasValue);
// lcd.clear();
Serial.println("Gas Value");
Serial.println(gasValue);
if(gasValue<1200)
{
lcd.setCursor(0,0);
lcd.print("Gas Value: ");
lcd.print(gasValue);
lcd.setCursor(0, 1);
lcd.print("Fresh Air");
Serial.println("Fresh Air");
delay(4000);
lcd.clear();
}
else if(gasValue>1200)
{
lcd.setCursor(0,0);
lcd.print(gasValue);
lcd.setCursor(0, 1);
lcd.print("Bad Air");
Serial.println("Bad Air");
delay(4000);
lcd.clear();
}

if(gasValue > 1200){
//Blynk.email("shameer50@gmail.com", "Alert", "Bad Air!");
Blynk.logEvent("pollution_alert","Bad Air");
}
}

8. Setting Up the Blynk Mobile Dashboard

9. Check Output

Conclusion:

By following this guide, you have successfully set up an air quality monitoring system project using the XIAO ESP32C6 board and Blynk IoT platform. This system will help you keep track of environmental conditions like temperature, humidity and AQI, alert you to poor air quality, ensuring a healthier living environment.

Altimeter and Environment Sensor Using BME280 and ESP32
Exit mobile version