Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MQ-4 Semiconductor Gas Sensor
Detectable Gases	Methane, Propane, Butane, LPG, Natural Gas
Operating Voltage	5V DC
Output Signal	Digital Switch Output (TTL) and Analog Voltage
Preheat Time	24-48 Hours (Initial)
Response Time	< 10 Seconds
Recovery Time	< 30 Seconds
Sensitivity Adjustment	Potentiometer Included
Interface Compatibility	Arduino, Raspberry Pi, STM32, ESP32
Dimensions	32mm x 20mm x 14mm

6 reviews

Anonymous

Mar 21, 2026

Rating: 4/5

Good value, just remember to preheat

Great little module for the price. Just a heads up for beginners: you must let it run for at least 24 hours before calibration or your readings will be way off. Once warmed up, it detects propane from my grill tank very reliably.

Anonymous

Mar 16, 2026

Rating: 3/5

Needs careful calibration

The hardware is fine, but getting the right sensitivity took some trial and error. If you set the potentiometer too high, it gives false positives. Once calibrated correctly in a clean air environment, it performs well.

Anonymous

Mar 12, 2026

Rating: 5/5

Works great with Raspberry Pi

Connected this to my Raspberry Pi GPIO pins via an ADC converter. The sensitivity is impressive; it picked up faint gas odors that I could barely smell. Highly recommend for anyone starting with gas detection projects.

Anonymous

Mar 10, 2026

Rating: 4/5

Solid performance for DIY alarms

I built a standalone alarm system using this sensor and a buzzer. It triggers consistently when exposed to butane. The only downside is the power consumption is slightly higher than expected due to the heating element, but that's normal for this sensor type.

Anonymous

Mar 04, 2026

Rating: 5/5

Easy to interface

Used this for a university robotics project involving environmental monitoring. The pinout is standard and the documentation online is plentiful. It responded quickly when I tested it with a lighter (without direct flame contact).

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for my home safety project

This sensor module works exactly as described. I integrated it with an Arduino to monitor my kitchen for gas leaks. The analog output is stable after the initial preheat period, and the digital threshold is easy to adjust with the onboard potentiometer.

5 FAQ

Q: Is the output voltage compatible with 3.3V microcontrollers?

A: The module runs on 5V. While the digital output is often TTL compatible, the analog output may exceed 3.3V limits. We recommend using a voltage divider or a logic level converter when connecting to 3.3V boards like ESP32.

Q: What is the warm-up time before accurate readings can be taken?

A: For initial use, we recommend a preheat time of 24 to 48 hours to stabilize the sensor material. Subsequent power cycles usually require only a few minutes to reach operational stability.

Q: Does this module have a waterproof casing?

A: No, this is a bare PCB module intended for indoor use or integration into a custom enclosure. It is not water-resistant and should be protected from moisture and direct weather exposure.

Q: Does this module come with a heater circuit built-in?

A: Yes, the MQ-4 module includes the necessary heating circuit and operates on a standard 5V supply to maintain the sensor at the required operating temperature.

Q: Can this detect carbon monoxide (CO)?

A: No, the MQ-4 is specifically optimized for combustible gases like methane, propane, and butane. For Carbon Monoxide detection, please consider our MQ-7 or MQ-9 modules.

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