Arduino and MQ-5 Gas Sensor example

The MQ5 Gas Sensor module is useful for gas leakage detection. It is suitable for detecting H2, LPG, CH4, CO, Alcohol. Due to its high sensitivity and response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by using the potentiometer.

FEATURES

* High sensitivity to LPG, natural gas , town gas
* Small sensitivity to alcohol, smoke.
* Fast response .
* Stable and long life
* Simple drive circuit

Connection

here are the connections

Arduino Gas Sensor
5V VCC
GND GND
NC DOUT
Analog A0 AOUT

Code

void setup() 
{
  Serial.begin(9600);
}
 
void loop() 
{
  float sensorVoltage; 
  float sensorValue;
 
  sensorValue = analogRead(A0);
  sensorVoltage = sensorValue/1024*5.0;
 
  Serial.print("sensor voltage = ");
  Serial.print(sensorVoltage);
  Serial.println(" V");
  delay(1000);
}

 

Results

Again look at the serial monitor

sensor voltage = 0.70 V
sensor voltage = 0.69 V
sensor voltage = 0.68 V
sensor voltage = 0.67 V
sensor voltage = 0.67 V
sensor voltage = 0.66 V

 

Links

Mq-5 datasheet
MQ-5 Methane Natural Gas Sensor

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