Description:

In this project we are building a Natural Gas Detector using Arduino and MQ4 Gas Sensor. These detectors are used in rocky mountain and caves to detect natural gas which is used for commercial purposes. Here we have used MQ4 Gas Sensor is used to detect Natural Gas. When the gas is detected the LED glows and everything is controlled using Arduino UNO.

Circuit Diagram:

Components:

SR. NO.	COMPONENT	PINOUT DIAGRAM	BUY
1	Arduino UNO (Other Arduinos can be used too)	Arduino UNO Pinout Diagram⇗
2	Red LED
3	Green LED
4	MQ4 Gas Sensor	MQ4 Gas Sensor Pinout Diagram⇗

Steps and Info:

1. Get correct components as given. You can buy online or offline. I buy electronics components mostly from Amazon.

2. Start connecting the components. If you are new to connecting components in an electronic circuit, then use a Breadboard or you can straight up make connections using Jumper wires but it will create problem when there will be two or more connections needed at one pin (for example two or more different sensors 5V connection to Arduino’s 5V pin). But before soldering components on a PCB or printing a PCB for your circuit, better try using breadboard so that any errors and mistakes can be observed on breadboard and not after soldering. Or do connections in your way.

3. Now after building the circuit, download the Arduino IDE from https://www.arduino.cc/ website.

4. If you are new to Arduino IDE software, then watch this video we made specially for beginners about Arduino IDE.

5. If you know Arduino IDE then straight up copy the code we given and paste it into the Arduino IDE sketch.

6. Connect the Arduino to your Computer/device. Select a proper port, proper Arduino type and whatever other settings are. Here it is Arduino UNO. (If you don’t know what this all is then watch our video: ).

7. Compile the code and Upload it.

8. If any error occurs then try to troubleshoot it by finding/copy-pasting it into our Solve Errors page https://electronicsprojects.in/solve-errors/, or you can straight up paste the error on Internet and you know the rest. Also check if there are no spelling/syntax errors in the code. Compile the code again once to check if errors are fixed. I have given proper connections and code but still nothing is perfect.

9. Once code compiles and uploads smoothly, you can start testing the working of your circuit/project.

10. Now for this project, take your device to a place where there is a source of natural gas and check if the MQ4 gas sensor detects the gas. If it detects, then the red LED will turn ON, otherwise green LED will stay ON always. If it doesn’t then find what’s wrong. Check connections, code and whatever it is.

11. If you don’t have any Natural gas source near you, then you can use a simple smoke.

Program Code:

/* https://www.electronicsprojects.in Natural Gas Detector using Arduino, MQ4 Gas Sensor and LED */

int RedLED = 11;
int GreenLED = 10;
int MQ4 = A5;
int SENSORTHRESHOLD = 250;
void setup()
{
pinMode(RedLED, OUTPUT);
pinMode(GreenLED, OUTPUT);
pinMode(MQ4, INPUT);
Serial.begin(9600);
}
void loop()
{
int analogValue = analogRead(MQ4);
Serial.println("Val: " +analogValue);
digitalWrite(GreenLED, HIGH);
if (analogValue >= SENSORTHRESHOLD)
{
digitalWrite(GreenLED, LOW);
digitalWrite(RedLED, HIGH);
}
else
{
digitalWrite(RedLED , LOW);
}
delay(5000);
}

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