MQ-2 Gas Sensor Module

Product Description

Overview

The MQ-2 Gas Sensor Module is one of the most widely used gas detection modules in electronics and IoT projects. It is based on the MQ-2 gas sensor with an onboard LM393 comparator, allowing both analog gas concentration measurement and adjustable digital threshold detection.

The module features an onboard potentiometer for sensitivity adjustment, power and status LEDs, and a heated sensing element for reliable gas detection. It is commonly used in gas leak alarms, smoke detection systems, industrial monitoring, and smart home safety applications.

Specifications

Sensor Type: Semiconductor Gas Sensor

Sensor Model: MQ-2

Comparator IC: LM393 Dual Voltage Comparator

Operating Voltage: 5 V DC

Current Consumption: Approximately 150 mA (Heater Included)

Heater Voltage: 5 V DC

Heater Resistance: 31 Ω ±3 Ω

Preheat Time: Approximately 20–60 Seconds (24 Hours recommended for best calibration)

Detection Gases: LPG, Propane, Methane (CH₄), Hydrogen (H₂), Smoke, Butane, Natural Gas

Detection Range: 300 ppm to 10,000 ppm

Output Type: Analog Output (AO), Digital Output (DO)

Digital Output Level: LOW when gas concentration exceeds the threshold, HIGH under normal conditions

Sensitivity Adjustment: Onboard Potentiometer

Interface: VCC, GND, AO (Analog Output), DO (Digital Output)

Indicator LEDs: Power LED, Detection Status LED

Operating Temperature: -10°C to +50°C

Operating Humidity: 5% to 95% RH (Non-Condensing)

PCB Dimensions: Approximately 40 × 20 mm

Weight: Approximately 8–10 g