Wemos MQ5 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

Specifications​

Please note that the best preheat time for the sensor is above 24 hours

Parts List

I recommend you try and get a kit of all the MQ sensors, you can buy these individually but you can also get a kit for about $9

Here are the parts I used

Connection

here are the connections for my sensor

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