This is an Arduino CH4 gas sensor.  It uses MQ4 probe which is able to detect natural gas, CH4. It is less sensitivity in detecting  alcohol, cooking fumes, and cigarette smoke.

The sensitivity can be adjusted by the potentiometer. The output is proportional to the density of gas. You can use analog reading to read the data from this sensor. 

To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino microcontroller.  


Improvement List

  • Standard assembling structure (Times-of-5mm Center distance between two 3mm(0.12") mounting holes)
  • Easily recognized interfaces for analog and digital connections
  • Icons to simply illustrate sensor function
  • High-quality connector
  • Immersion gold surface

SPECIFICATION

  • Power supply: 5V
  • Interface type: Analog
  • Pin Definition:  1-Output  2-GND  3-VCC
  • High sensitivity to CH4´╝îNatural gas
  • Small sensitivity to alcohol, smoke
  • Fast response
  • Stable and long life
  • Simple drive circuit
  • Size: 40x20mm(1.57"x0.79") 

DFRobot Gravity: Analog CH4 Gas Sensor (MQ4) For Arduino

  • Brand: DFRobot
  • Product Code: SEN0129
  • Availability: In Stock
  • $7.00