Interface GAS Sensor With 8051

A Gas detector is a device that detects the presence of gases in an area.

  • Gas sensors spontaneously react to the gas present .
  • These sensors usually employ an audible alarm to alert people when a dangerous gas has been detected.
  • Each type have unique characteristics to detect the gas.
  • Sensitive material of gas sensor is SnO2,which have lower conductivity in clean air..
  • When the target flammable gas exist, the sensors conductivity gets higher along with the gas concentration rising.
  • Gas sensor can detect different kinds of flammable gases,especially it has high sensitivity to LPG (propane).


  • Domestic gas leakage alarm.
  • Industrial flammable gas alarm.
  • Portable gas detector.

Hardware Required

  • Gas Sensor.
  • ADC 0804.
  • 8051 MicroController.

Pin Diagram

  • VCC:+5v.
  • A0=Analog Output.
  • GND: GND.