# Analog Gas Sensor (MQ2)

**Type:** Product page · **SKU:** SEN0127 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/analog-gas-sensor-mq2.html ([markdown](https://core-electronics.com.au/analog-gas-sensor-mq2.html.md))

The analog gas sensor - MQ2 is used in gas leakage detecting equipments in consumer and industry markets, this sensor is suitable for detecting LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke.

## Pricing

- **Price:** $11.40 (inc GST) — $10.36 AUD, exc GST
- **Quantity discounts:** 6+ $9.85 (exc GST) · 12+ $9.43 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 350 more in 8–12 days.

## Description

The MQ-2 Analog Gas Sensor module is a maker-friendly sensor used to detect the presence of **flammable gases and smoke**. It produces an **analog voltage output** that changes with gas concentration, making it well suited for DIY projects such as gas-leak indicators, ventilation triggers, and general air/smoke presence monitoring (for prototyping and educational use).

The MQ-2 responds to a range of gases including **LPG, i-butane, propane, methane (natural gas), hydrogen, alcohol vapour, and smoke**. Because it is **not selective** (multiple gases can trigger a response), it’s best used to detect trends/changes or calibrated for your specific environment. An onboard **potentiometer** allows you to adjust sensitivity for your application.

This is an **analog** sensor module. Microcontrollers with analog inputs (e.g., Arduino) can read it directly. Devices without analog inputs (e.g., Raspberry Pi) require an external ADC. MQ-series sensors include a heater element, so allow time for warm-up to reach stable readings.

## Specifications

- Power supply: 5V
- Interface type: Analog output
- Pin definition: 1-Output 2-GND 3-VCC
- Detectable gases: LPG, i-butane, propane, methane, hydrogen, alcohol vapour, smoke
- Wide detecting scope (see datasheet for typical sensitivity curves)
- Fast response and high sensitivity
- Sensitivity adjustable via onboard potentiometer
- Simple drive circuit
- Stable and long life
- Size: 40x20mm
 
## Parts List

- 1 x Analog Gas Sensor (MQ-2)
 
## Documents

- [Wiki Doc](https://wiki.dfrobot.com/Analog_Gas_Sensor_SKU_SEN0127)
- [MQ-2 Datasheet](https://core-electronics.com.au/attachments/localcontent/MQ-2_61268e52b42.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/_/i/_igp1312-1.jpg)