MQ2 MQ-2 SMOKE SENSOR MODULE
- Operating voltage: 5V
- Analog output voltage: 0V to 5V
- Digital output voltage: 0V or 5V (TTL Logic)
- Preheat duration: 20 seconds
- Sensitivity range: 200 to 10,000 ppm
- Gases detected: LPG, Smoke, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide
- Dimensions: 3.6 x 2 x 1 cms
- Weight: 5 grams
₨ 289 ₨ 364
MQ-2 Smoke and Gas Sensor Price in Pakistan
The MQ-2 module is a heated metal-oxide semiconductor sensor for educational smoke and combustible-gas detection projects. It responds broadly to several gases and vapours, so it is useful for relative detection and threshold experiments rather than selective laboratory measurement.
Connections and outputs
- VCC: listed 5V supply
- GND: common ground
- AOUT: analog signal that changes with sensor response
- DOUT: adjustable digital threshold output on supported module versions
Listed characteristics
- Broad response to smoke and combustible gases such as LPG, propane, methane and hydrogen
- Listed sensitivity range: approximately 200 to 10,000ppm, depending on gas and calibration
- Analog output: up to the module supply range
- Digital TTL threshold output
- Approximate module dimensions: 36 × 20 × 10mm
Warm-up and calibration
The sensing element contains a heater and needs warm-up before readings stabilise. Follow the sensor manufacturer’s conditioning and calibration procedure for the intended gas and environment. Temperature, humidity, ageing and exposure history can change the response.
Safety limitation
This module is intended for learning and prototyping. It is cross-sensitive, is not a selective gas analyser and must not replace a certified smoke alarm, gas alarm or life-safety detector.
For controller testing, see the Arduino UNO R3 with cable. Explore more gas sensors from Robonation Pakistan.
For sensor guidance, review the official Winsen MQ-2 documentation.
Frequently Asked Questions
Which gases can an MQ-2 module respond to?
MQ-2 sensors are broadly sensitive to smoke and several combustible gases, including LPG, propane, methane and hydrogen. They are not selective laboratory instruments.
Does the MQ-2 need warm-up and calibration?
Yes. Stable results require heater warm-up and calibration for the intended environment and threshold.
Can this module replace a certified gas or smoke alarm?
No. It is intended for learning and prototyping and must not be relied on as a certified life-safety alarm.
What is the difference between the MQ-2 analog and digital outputs?
The analog output changes with the sensor response, while the digital output switches when the adjustable module threshold is crossed.
Can the MQ-2 identify which specific gas is present?
No. It responds to several smoke and combustible-gas types and is cross-sensitive, so a single reading cannot reliably identify a particular gas.
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