Gas Leakage detection system

Domains/IoT/MiniProjects/Gas Leakage detection system/code.ino

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+#include <LiquidCrystal_I2C.h>
+int a,a1,d=12,b=27;
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+void setup() {
+  Serial.begin(115200);     
+  pinMode(32, INPUT);  
+  pinMode(d, OUTPUT);  
+  pinMode(b, OUTPUT);      
+  lcd.init();
+  lcd.backlight();
+  lcd.setCursor(0, 0);
+  lcd.println("Status :");
+}
+void loop() {
+  a = analogRead(32);  
+  a1=map(a,843,4041,0,100);
+  lcd.setCursor(0, 1);      
+  lcd.print("                ");
+  lcd.setCursor(0, 1); 
+
+  if(a1>=65){
+   lcd.println ("Gas Detected!!");
+   digitalWrite(d,HIGH);
+   tone(b,1000);
+  }
+  else{
+    lcd.println ("Normal condition!!");
+    digitalWrite(d,LOW);
+    noTone(b);}
+
+
+  delay(500);                
+}

Domains/IoT/MiniProjects/Gas Leakage detection system/readme.md

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+🔥 Gas Detection System using ESP32 & MQ Sensor
+
+This project detects the presence of gas or smoke using an analog gas sensor (e.g., MQ-2/MQ-135) connected to an ESP32 microcontroller. When the gas concentration exceeds a threshold, the system triggers a buzzer and displays a warning message on an I2C LCD display.
+
+🧠 Features
+
+🚨 Detects harmful gas concentrations in the environment
+
+💡 LCD display for real-time status updates
+
+🔔 Buzzer alert for high gas levels
+
+💾 Serial monitor for debugging
+
+⚙️ Adjustable threshold for sensitivity
+
+⚙️ Components Used
+
+| Component                       | Description                        |
+| ------------------------------- | ---------------------------------- |
+| **ESP32**                       | Main controller                    |
+| **MQ Gas Sensor (e.g., MQ-2)**  | Detects gas levels                 |
+| **16x2 I2C LCD Display (0x27)** | Displays gas status                |
+| **Buzzer**                      | Sounds alarm when gas detected     |
+| **LED (optional)**              | Visual indicator for gas detection |
+| **Connecting Wires**            | For circuit connections            |
+
+🧩 Circuit Connections
+
+| ESP32 Pin | Component        | Description     |
+| --------- | ---------------- | --------------- |
+| 32        | MQ Sensor Output | Analog input    |
+| 12        | LED              | Alert indicator |
+| 27        | Buzzer           | Alarm output    |
+| SDA       | LCD SDA          | I2C data        |
+| SCL       | LCD SCL          | I2C clock       |
+
+💡 Note: Ensure correct LCD I2C address (commonly 0x27 or 0x3F).
+
+💻 Code Explanation
+
+🔸 Setup
+
+Initializes the LCD and Serial Monitor.
+
+Configures pins for sensor input, buzzer, and LED output.
+
+🔸 Loop
+
+Reads analog value from the gas sensor.
+
+Maps it to a percentage scale (0–100).
+
+Displays “Normal Condition” or “Gas Detected!!” on the LCD.
+
+Turns on the buzzer and LED if gas level ≥ 65%.
+
+🧪 Sample Output
+
+LCD Display:
+
+Status :
+
+Gas Detected!!
+
+Serial Output:
+
+Gas value: 3250 → Gas Detected!!
+
+🚀 Future Enhancements
+
+🌐 Send alerts to ThingSpeak or Blynk IoT Dashboard
+
+📱 Integrate mobile notifications (via Wi-Fi)
+
+📊 Add data logging and visualization
+
+🧰 Dependencies
+
+Install the following libraries in the Arduino IDE:
+
+LiquidCrystal_I2C
+
+Wire
+
+🏗️ How to Run
+
+Connect all components as per the circuit table.
+
+Upload the code to ESP32 using Arduino IDE.
+
+Open the Serial Monitor at 115200 baud rate.
+
+Observe LCD and buzzer behavior when exposed to gas.
+
+✨ Author
+
+Developed by: Shirsha Nag
+
+Language: Arduino C
+
+Board: ESP32