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MQ5 MQ-5 gas sensor (LPG, natural gas, coal gas)

K-TECHNICS
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KSh350.00

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The MQ5 Gas Sensor is a specialized, low-cost metal oxide semiconductor (MOS) sensor designed primarily to detect Liquefied Petroleum Gas (LPG), natural gas (methane), and coal gas. It features high sensitivity to combustible gases while safely ignoring everyday background interference like alcohol, cigarette smoke, and cooking fumes.
Technical Specifications
The standard operational parameters include:
  • Target Gases: LPG, Methane, Propane, Butane.
  • Detection Range: 200 to 10,000 ppm (parts per million).
  • Operating Voltage: 5V DC (± 0.1V).
  • Heater Power Consumption: Less than 800 mW (The module gets warm to the touch during normal operation).
  • Sensing Material: Tin Dioxide (SnO₂) enclosed behind a flame-arresting stainless steel mesh.
Pinout and Module Breakdown
Most standard hobbyist breakout modules feature 4 pins, a comparator chip, and a built-in potentiometer.
Pin Name Pin Type Description
VCC Power Input Connects to the 5V pin of your microcontroller.
GND Ground Connects to the system ground.
AOUT (AO) Analog Output Delivers a 0V to 5V signal proportional to the gas density.
DOUT (DO) Digital Output Provides a High/Low TTL signal using an onboard Comparator.
  • Built-in Potentiometer: Turning this small screw adjusts the exact gas concentration threshold required to flip the DOUT pin from Low to High.
How It Works
  1. Heating Process: An internal nichrome heater warms up the Tin Dioxide (SnO₂) layer.
  2. Oxygen Trap: In clean air, oxygen molecules trap free electrons inside the SnO₂ film, creating a high-resistance barrier.
  3. Gas Reaction: When a combustible gas enters, it reacts with the trapped oxygen ions, liberating electrons back into the semiconductor.
  4. Signal Readout: This lowers the overall resistance, causing the AOUT voltage to rise.

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