Project V - 18. Gas Leakage Alarm using MQ-2 Sensor (Arduino Based)

Gas Leakage Alarm using MQ-2 Sensor

Arduino UNO reads gas sensor MQ-2 with analog output data. If there is a leaking gas, the alarm will sound.

Hardware Requirement

• MQ-2 Gas Sensor Module
• Relay Module
• Alarm Sound Motor AC
• Power supply +5 Volt
• Jumper

MQ2 Gas Sensor Module | Source               Alarm Sound Motor AC | Source

Block Diagram

Schematic

Arduino - MQ2 Module Wiring

Arduino - Relay - LED Indikator Wiring

Source Code/Sketch

float vinSensor;
int adc;
byte kedip;
void setup(){
// Serial.begin(9600);
pinMode(8,OUTPUT);
digitalWrite(8,LOW);
pinMode(9,OUTPUT);
digitalWrite(9,LOW);
do{
adc=(analogRead(A0));
vinSensor = adc * (5.0 / 1023.0);
digitalWrite(9,LOW);
delay(100);
digitalWrite(9,HIGH);
delay(100);
}
while(vinSensor > 1.50);
digitalWrite(9,LOW);
}
void loop(){
adc=(analogRead(A0));
vinSensor = adc * (5.0 / 1023.0);
// Serial.println(vinSensor);
// untuk menampilkan hasil pembacaan sensor hilangkan
// tanda komentar pada serial
// kepekaan pembacaan sensor dapat di sesuaikan dengan
// merubah nilai perbandingan 1.5V
if (vinSensor > 1.5){
digitalWrite(8,HIGH);
digitalWrite(9,HIGH);
delay(1000);
do{
adc=(analogRead(A0));
vinSensor = adc * (5.0 / 1023.0);
}
while(vinSensor > 1.00);
digitalWrite(8,LOW);
digitalWrite(9,LOW);
}
if (kedip<20){
digitalWrite(9,HIGH);
}
else if(kedip<200){
digitalWrite(9,LOW);
}
else{
kedip=0;
}
kedip++;
delay(10);
}

How it Works

1. Connect the Arduino with Peripherals needed
2. Plug in the Power Source on the device
3. Compile and upload the script program above to your arduino

4. First wait until the MQ-2 sensor is ready, the LED blinks on and off with a 100 ms of delay.

5. If the sensor is ready then the LED indicator goes off longer than when LED is on.

6. If you want to try you can give gas on the sensor surface using Gas lighters.

Video for Project V - 18. Gas Leakage Alarm using MQ-2 Sensor (Arduino Based)

Required File