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IOT Based Air Quality Monitoring System with ESP32 & BME680 Sensor

Abhishek Singh
Air Quality Monitoring System Project with ESP32 & BME680 Sensor

Air Quality Monitoring System Project with ESP32 & BME680 Sensor

Air pollution has become a critical issue in modern society, affecting human health and the environment. Monitoring air quality is essential for creating a healthier living environment. With advancements in IoT (Internet of Things) technology, real-time air quality monitoring has become more accessible and efficient. In this project, we will build an IoT-Based Air Quality Monitoring System using the ESP32 microcontroller, BME680 sensor, and Blynk IoT platform to collect and analyze data on air quality parameters such as temperature, humidity, pressure, and volatile organic compounds (VOC).

BME680 Sensor Pinout
BME680 Sensor

IOT Based Air Quality Monitoring System: ESP32 & BME680

The system consists of an ESP32 microcontroller that collects data from the BME680 environmental sensor and transmits it to the Blynk IoT cloud over WiFi. Users can monitor real-time air quality through the Blynk mobile application. The system provides continuous updates, allowing users to track air quality trends and take preventive measures if pollution levels rise.

Features of the System:

Components Required

To build this project, you will need the following components:

Component Description
ESP32 Board WiFi-enabled microcontroller
BME680 Sensor Air quality sensor (VOC, temp, humidity, pressure)
Jumper Wires For circuit connections
Breadboard For prototyping connections
5V Power Source Power supply for ESP32

Air Quality Monitoring System Circuit Diagram & Connections

The BME680 sensor communicates with the ESP32 using the I2C protocol. Below are the pin connections:

BME680 Pin ESP32 Pin
VCC 3.3V
GND GND
SDA GPIO21
SCL GPIO22
ESP32 with BME680 Sensor Air Quality Monitor
Interfacing ESP32 with BME680 Sensor

Ensure that the connections are secure and correctly configured before proceeding with the software setup.

Setting Up Blynk Application

To visualize the data remotely, we will use the Blynk IoT platform:

Programming the ESP32

The ESP32 microcontroller is programmed using Arduino IDE with necessary libraries installed.

Required Libraries:

Install these libraries in Arduino IDE before uploading the code.

Code for Air Quality Monitoring System

#define BLYNK_TEMPLATE_ID "TMPL3l_fOnAG7"
#define BLYNK_TEMPLATE_NAME "Air Quality Monitor"
#define BLYNK_AUTH_TOKEN "YourAuthToken"

#define BLYNK_PRINT Serial
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME680.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "YourSSID";
char pass[] = "YourPassword";

Adafruit_BME680 bme;
BlynkTimer timer;

void setup() {
    Serial.begin(115200);
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    Serial.println("Connected to WiFi!");

    Blynk.begin(auth, ssid, pass);

    if (!bme.begin()) {
        Serial.println("BME680 Sensor not found!");
        while (1);
    }

    bme.setTemperatureOversampling(BME680_OS_8X);
    bme.setHumidityOversampling(BME680_OS_2X);
    bme.setPressureOversampling(BME680_OS_4X);
    bme.setGasHeater(320, 150);

    timer.setInterval(10000L, sendSensorData);
}

void sendSensorData() {
    if (!bme.performReading()) {
        Serial.println("Failed to read BME680 sensor!");
        return;
    }

    float temp = bme.temperature;
    float hum = bme.humidity;
    float press = bme.pressure / 100.0;
    float air_quality = bme.gas_resistance / 1000.0;

    Serial.print("Temperature: "); Serial.print(temp); Serial.println(" °C");
    Serial.print("Humidity: "); Serial.print(hum); Serial.println(" %");
    Serial.print("Pressure: "); Serial.print(press); Serial.println(" hPa");
    Serial.print("Air Quality: "); Serial.print(air_quality); Serial.println(" kOhms");

    Blynk.virtualWrite(V0, temp);
    Blynk.virtualWrite(V1, hum);
    Blynk.virtualWrite(V2, press);
    Blynk.virtualWrite(V3, air_quality);
}

void loop() {
    Blynk.run();
    timer.run();
}

Working of Air Quality Monitor with ESP32 & BME680

Smart Pollution Monitoring System using ESP32 & BME680 | IoT-Based Air Quality Tracker

Explanation of the IoT-Based Air Quality Monitoring System Code

This code is designed to monitor air pollution using an ESP32, a BME680 sensor, and the Blynk IoT platform. The system collects temperature, humidity, air pressure, and air quality (VOC levels) and sends the data to Blynk for remote monitoring.

Libraries & Definitions

#define BLYNK_TEMPLATE_ID "TMPL3l_fOnAG7"
#define BLYNK_TEMPLATE_NAME "Pollution Monitoring System"
#define BLYNK_AUTH_TOKEN "Auth Code"

#define BLYNK_PRINT Serial
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME680.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

WiFi and Blynk Setup

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Your SSID";
char pass[] = "Your Password";

Adafruit_BME680 bme;
BlynkTimer timer;

Setup Function (setup())

void setup() {
    Serial.begin(115200);

🟢 Connect to WiFi

    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    Serial.println("Connected to WiFi!");

🟢 Connect to Blynk

    Blynk.begin(auth, ssid, pass);

🟢 Initialize the BME680 Sensor

    if (!bme.begin()) {
        Serial.println("Could not find a valid BME680 sensor!");
        while (1);
    }

🟢 Configure Sensor Settings

    bme.setTemperatureOversampling(BME680_OS_8X);
    bme.setHumidityOversampling(BME680_OS_2X);
    bme.setPressureOversampling(BME680_OS_4X);
    bme.setGasHeater(320, 150); // 320°C for 150ms

🟢 Schedule Data Collection Every 10 Seconds

    timer.setInterval(10000L, sendSensorData);

Sending Sensor Data (sendSensorData())

void sendSensorData() {
    if (!bme.performReading()) {
        Serial.println("Failed to read BME680 sensor!");
        return;
    }

🟢 Read Sensor Values

    float temp = bme.temperature;
    float hum = bme.humidity;
    float press = bme.pressure / 100.0; // Convert to hPa
    float air_quality = bme.gas_resistance / 1000.0; // Convert to kOhms

🟢 Print Data to Serial Monitor

    Serial.print("Temperature: "); Serial.print(temp); Serial.println("°C");
    Serial.print("Humidity: "); Serial.print(hum); Serial.println("%");
    Serial.print("Pressure: "); Serial.print(press); Serial.println(" hPa");
    Serial.print("Air Quality (VOC): "); Serial.print(air_quality); Serial.println(" kOhms");

🟢 Send Data to Blynk

    Blynk.virtualWrite(V0, temp);
    Blynk.virtualWrite(V1, hum);
    Blynk.virtualWrite(V2, press);
    Blynk.virtualWrite(V3, air_quality);

Main Loop (loop())

void loop() {
    Blynk.run();
    timer.run();
}

Expected Output (Serial Monitor)

Connecting to WiFi...
Connected to WiFi!
Temperature: 25.5°C
Humidity: 60.3%
Pressure: 1012.5 hPa
Air Quality (VOC): 150.2 kOhms

How to View Data on Blynk

This project is scalable and can be extended with alerts, data logging, or AI-based predictions.

Applications of Air Quality Monitoring System

Conclusion

This IoT-based air quality monitoring system provides an efficient way to track environmental conditions using an ESP32 and BME680 sensor. The integration with Blynk allows users to access real-time data remotely. This project can be further enhanced by adding alerts, data logging, and AI-based predictive analysis for improved air quality management.

By implementing this system, we contribute to a cleaner and healthier environment while leveraging the power of IoT technology.

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