AIR POLLUTION DETECTOR

Corona virus (Covid 19) is spreading all around the world. Polluted air can cause a lot of health diseases. But how to find out if the air around us is polluted or not. This is the simple project that detects air pollution and returns analog value. This data can be further used to keep ourselves alert and take precaution from polluted air.

CIRCUIT DIAGRAM :

CODE :
#include <ESP8266WiFi.h> #include <Servo.h> Servo servo; //Static IP address configuration IPAddress staticIP(192, 168, 225, 81); //ESP static ip IPAddress gateway(192, 168, 225, 1); //IP Address of your WiFi Router (Gateway) IPAddress subnet(255, 255, 255, 0); //Subnet mask //Define wifi configuration const char* ssid = "YOUR_SSID"; const char* password = "YOUR_WIFI_PASSWORD"; // Create an instance of the server WiFiServer server(80); void setup() { Serial.begin(9600); // prepare GPIO 4 servo.attach(4); //Motor in home position servo.write(90); servo.detach(); delay(100); // Connect to WiFi network Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); //Configuring Static IP WiFi.config(staticIP,gateway,subnet); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Start the server server.begin(); Serial.println("Server started"); // Print the IP address Serial.println(WiFi.localIP()); } void loop() { // Check if a client has connected WiFiClient client = server.available(); if (!client) { return; } // Wait until the client sends some data // Serial.println("new client"); while(!client.available()){ delay(1); } // Read the first line of the request String req = client.readStringUntil('\r'); //Serial.println(req); //Serial.println("req"); client.flush(); // Match the request int val; Int air = 0; if (req.indexOf("/gpio/0") != -1) val = 0; else if (req.indexOf("/gpio/1") != -1) val = 1; else if(req.indexOf("CHECK_AIR") != -1) { Air_status = analogRead(0); client.print(Air_status) } // else if(req.indexOf("OFF1") != -1) // { // digitalWrite(D0, HIGH); // } else { client.stop(); return; } client.flush(); // Prepare the response String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now "; s += (val)?"high":"low"; s += "</html>\n"; // Send the response to the client //client.print(s); delay(1); Serial.println("Client disconnected"); // The client will actually be disconnected // when the function returns and 'client' object is destroyed }

DESCRIPTION :

ARDUINO SETTINGS :

Most of the code is commented. Some of the important points to highlight

In the code we need to change the gateway according to our network.
Simple method - (For windows)

Open command prompt - type “ipconfig”
Look for “default gateway”. A set of four numbers will be displayed. In my case its 192.168.xxx.1
Note this “xxx” number, goto line in the code where “staticIP” is defined and replace the 3rd number with this number you just found.
Ex: default gateway is 192. 169. 255 .1

So in my code -

IPAddress staticIP (192, 168, 225, 81); //ESP static ip

IPAddress gateway (192, 168, 225, 1);

Next step is changing SSID and password

Replace YOUR_SSID in this line - const char* ssid = "YOUR_SSID" with your wifi name.
Replace YOUR_WIFI_PASSWORD in the line const char* password = "YOUR_WIFI_PASSWORD"; with your wifi password.

ARDUINO APP SETTINGS :

To test the project , open the android app “LINK HERE” , type IP address of the device and same gateway .
Now type “CHECK_AIR” keyword into send section and hit send.

In the receive section of the app you will be able to see the response from the arduino device.

TECH KEEDA

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AIR POLLUTION DETECTOR