Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MQ-7
Detection Gas	Carbon Monoxide (CO)
Operating Voltage	5V DC
Output Signal	Digital Switching Output (0 and 1) & Analog Output
Sensitivity Range	20 to 2000 ppm
Heater Voltage	5.0V ± 0.2V
Load Resistance	Adjustable via Potentiometer
Preheat Time	Approximately 24-48 hours for stabilization
Interface Type	3-Pin Header (VCC, GND, DO/AO)
Application	Home Safety Alarms, Industrial Gas Detectors, DIY Electronics

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Great sensitivity

Used this for a university project on air quality monitoring. The detection range is impressive, and the response time is fast enough for real-time alarms. Highly recommend for educational purposes.

Anonymous

Mar 25, 2026

Rating: 5/5

Easy to integrate

Plug and play with most microcontrollers. The documentation provided by the seller was helpful in setting up the code for threshold alerts. Very satisfied with this purchase.

Anonymous

Mar 21, 2026

Rating: 4/5

Good sensor, requires patience

The sensor itself is high quality and sensitive to CO. Just remember that it needs a long preheat time (about 24 hours) before you get accurate readings. Once warmed up, it responds quickly to test gas.

Anonymous

Mar 11, 2026

Rating: 5/5

Perfect for my home safety project

This MQ-7 module works exactly as described. I integrated it into an Arduino-based alarm system for my garage. The analog output is stable after the initial preheat period, and the digital threshold is easy to adjust with the onboard potentiometer.

Anonymous

Mar 04, 2026

Rating: 4/5

Solid performance

Works well for detecting carbon monoxide leaks in simulation environments. The only downside is the power consumption due to the heating element, but that is standard for this type of semiconductor sensor.

Anonymous

Mar 03, 2026

Rating: 5/5

Reliable and affordable

I've tested several CO sensors, and this Risym module offers the best value. The PCB is well-made, and the soldering points are clear. It pairs perfectly with Raspberry Pi and ESP32 boards.

5 FAQ

Q: What is the maximum current draw for the heater?

A: The heating element typically draws around 150mA to 200mA at 5V. Please ensure your power supply or microcontroller pin can handle this current, or use an external power source for the VCC.

Q: How long does the sensor need to preheat before use?

A: For initial stabilization, we recommend powering the sensor for 24 to 48 hours. After the first cycle, it typically requires a shorter warm-up time of about 5-10 minutes upon subsequent power-ups.

Q: Is the digital output normally high or low?

A: The digital output state depends on your adjustment of the potentiometer. By default, it usually outputs High when no gas is detected and switches to Low when the gas concentration exceeds the set threshold, but this can be inverted via code logic if needed.

Q: Does this module require a specific library for Arduino?

A: No specific library is required. You can read the analog value using the standard analogRead() function and set your own threshold in the code, or use the digital output directly.

Q: Can this detect natural gas or methane?

A: This MQ-7 module is specifically calibrated for Carbon Monoxide (CO). While it may show some reaction to other combustible gases, it is not recommended for detecting methane or natural gas; please look at the MQ-4 or MQ-5 models for those applications.

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