Arduino Uno GAS Sensor

This project demonstrates how to use a gas sensor with an Arduino Uno to detect the presence of gases in the environment.

The sensor's analog output is read by the Arduino, and the system determines if the gas concentration exceeds a predefined threshold. If it does, a message is printed to the serial monitor indicating gas detection.

Components Needed

• Arduino Uno
• Gas Sensor (e.g., MQ-2, MQ-3, MQ-5)
• Jumper Wires
• Breadboard
• Power supply 12 v

Block Diagram

Hardware Wiring Explanation:

Connect the Gas Sensor to Arduino Uno:

Connect the gas sensor to the Arduino Uno as described in the circuit setup section.

Software (Arduino IDE):

Open the Arduino IDE and create a new sketch.

Copy and paste the provided Arduino code into the sketch.

Upload the code to the Arduino Uno.

Power the Arduino

Connect the Arduino to your computer using a USB cable.

Monitor the Output

Open the serial monitor with a baud rate of 9600.

Observe the serial monitor output displaying "Gas detected!" when the sensor value exceeds the threshold (300) and "No gas detected." otherwise. The sensor value will also be printed for reference.

Applications

Notes

Ensure the gas sensor is correctly connected to the Arduino Uno and powered.

Adjust the threshold value in the code (

Allow the gas sensor to preheat according to the manufacturer's instructions for accurate readings.