ESP8266 Based Air Pollution Detector

Components Required

• • NodeMCU ESP8266

• • PMS5003 air quality sensor (PM2.5 & PM10)

• • The CO2, NH3, benzene, etc. detection sensor: MQ-135 Sensor

• • We are using DHT22 Sensor for temperature and humidity measurements.

• • OLED Display (optional; used to display local data)

• • Jumper wires

• • Breadboard

Step-by-Step Instructions

1. Setting Up the Hardware

First connect the sensors with the NodeMCU board. The following connections are suggested:

MQ-135 Sensor:

VCC to 3.3V or 5V of NodeMCU

GND to GND of NodeMCU

NodeMCU has an analog output A0 to A0.

PMS5003 Sensor:

VCC to 5V of NodeMCU

GND to GND of NodeMCU

TX to D5 of NodeMCU

DHT22 Sensor:

VCC to 3.3V

GND to GND

Data Pin to D4

OLED Display:

SDA to D2

SCL to D1

2. NodeMCU ESP8266 Programming

To program, we will use the Arduino IDE and make sure they have the required libraries, DHT22, Adafruit SSD1306, and SoftwareSerial for PMS5003.

Code Explanation

Sensor Setup: The dht22 sensor code initiates to read temperature and humidity from the container. We can also set two sensors, PMS5003 and MQ-135, up for measuring the PM values as well as CO2 and other air quality parameters.

Wi-Fi Connection: It allows the ESP8266 to connect to the Wi-Fi network, that is necessary for the realtime data transmission.

OLED Display: For local reference, it also displays sensor readings on the OLED screen.

Cloud Integration: Remote monitoring can send data through cloud server using HTTP or MQTT protocols.

How It Works

Now power the NodeMCU and make sure all the sensors are connected right.

Use the Arduino IDE and Upload Code.

After being connected to Wi-Fi, the system will begin to read data from MQ-135 and PMS5003 sensors.

The real time data collected is displayed on the OLED and sent to the cloud for remote access.

Enhancements: Advanced Features

1. And I added GPS for location based monitoring.

Adding a GPS module will allow air quality to be tracked in certain locations which is really useful for mobile air quality monitoring.

2. Creating a Mobile App for Real Time Alerts

Create a mobile app that will get realtime notifications depending on the air quality level. The functionality of this feature includes sounding an alert to the users, when pollutant levels exceed the safety thresholds.

The Air Pollution Detectors also show us various applications and benefits.

Personal Air Quality Monitoring: If elderly or children susceptible to pollution live with you, then keep track of air quality at home.

Industrial Monitoring: Air quality devises must be used to measure air quality in industrial areas.

Environmental Research: The device is used to collect data for research projects in the areas of the environment.

On NodeMCU and Air Pollution Detection Conclusion

Summarily, the air pollution detector based on ESP8266 is an efficient and very inexpensive air quality monitors able to monitor it in real time. With the NodeMCU ESP8266 we have the necessary features and flexibility to craft a connected device to enable insights into air pollution levels. Now you know if someone asks “NodeMCU what is?” then it’s an IoT development board that makes practical and impactful solution using NodeMCU like Air Pollution Detector.

Following this guide can help you build a useful system to measure and monitor air quality around you enabling you to stay informed of your surrounding air quality and take precautionary measures to protect your health.

CODE :

//Provided by ElectroGlobal
#include <WiFiManager.h>
#include "FirebaseESP8266.h"
#include <ESP8266WiFi.h>

#define nameofdevice "Device 1"

FirebaseData firedb;
int status;

void setup()
{
  status = 1;
  pinMode(D2, OUTPUT);
  pinMode(A0, INPUT);
  WiFi.mode(WIFI_STA);
  Serial.begin(115200);
  WiFiManager wm;

  bool res;

  res = wm.autoConnect("Air Pollution Detector", "pollution");
  if (!res) {
    Serial.println("Failed to connect");
  }
  else {
    Serial.println("connected...yeey :)");
    Firebase.begin( "smart-9b2ba-default-rtdb.firebaseio.com", "0CgaJ1CmWwsiNqAymhQnLHgqwXEbwkDvL9zXuFG6");
    Serial.println("Firebase Connected");
  }

}

void loop()
{

  int value = analogRead(A0);
  Serial.println(value);

    if (status == 1)    {
        if (value > 700)
        {
          Firebase.setString(firedb, "/database/Device 1/Pollution Level", "Device1" );
          Firebase.setString(firedb, "/database/alerts", "Device1" );
          digitalWrite(D2,HIGH);
          status = 0;
        }
    }
else{
    if (value < 700 )
    {

        status = 1;
                  digitalWrite(D2,LOW);

     }
}
delay(1000);