MQ5 LPG Smoke Detection Sensor Module


MQ5 LPG smoke detector belongs to the MQ gas sensor family. MQ5 is a sensitive gas sensor that can detect or sense liquefied gas, propane, butane, natural, and other combustible gases in the environment. And, is thus used in gas leakage detectors, other industrial gas detectors, or monitoring devices. The output voltage of the sensor increases when the concentration of gases or a gas increases. The sensitivity of the sensor is adjustable by using the onboard potentiometer.

The sensitive material of the MQ5 gas sensor is SnO2, which with lower conductivity in clean air. When the target flammable gas exists, the sensor’s conductivity gets higher along with the gas concentration rising MQ5 gas sensor has a high sensitivity to Methane, Propane, and Butane, and could be used to detect both Methane and Propane. The sensor could be used to detect different combustible gas, especially Methane, it is low cost and suitable for a vast array of application


MQ5 Gas Sensor Key Features

  • Sensitive for LPG, natural gas, coal gas
  • Output voltage boosts along with the concentration of the measured gases increases
  • Fast response and recovery
  • Adjustable sensitivity
  • Signal output indicator
  • Indication of the signal output.
  • Dual signal output (analog output, and TTL level output)
  • The TTL output signal is low. (When low output signal light, and can be connected directly to the microcontroller)
  • Has a long life and reliable stability

MQ5 Gas Sensor Pinout

Pin NamePin No.Description
Vcc1This pin powers the module, typically the operating voltage is +5V
GND2Used to connect the module to the system ground
Digital Out3You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer
Analog Out4This pin outputs 0-5V analog voltage based on the intensity of the gas 


  • Model: MQ-5
  • Sensor Type: Semiconductor
  • Standard Encapsulation: Bakelite, Metal Cap
  • Target Gas: LPG, CH4
  • Detection range: 300 ~ 10000ppm 
  • Loop Voltage Vc: 24V DC
  • Output Voltage Vs: 2.5V ~ 4.0V (in 2000ppm C3H8)
  • Preheat time: Over 48 Hours
  • Concentration Slope: <0.6(R3000ppm/R1000ppm C3H8)


  • They are used in gas leakage detecting equipment in family and industry and are suitable for detecting LPG, natural gas, and town gas, avoiding the noise of alcohol and cooking fumes and cigarette smoke.

Datasheet MQ5

You can download the datasheet for MQ5 LPG Smoke Detection Sensor by clicking the link given below:

See Also: CD4059 Program Divide-by-N Counter | MQ2 Combustible Gas Sensor Module | WROOM ESP32 Wifi Based Microcontroller Development Board