Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-3 Semiconductor Gas Sensor |
| Detectable Gas | Alcohol, Ethanol, Methane |
| Operating Voltage | 5V DC |
| Output Signal | Analog (AO) and Digital (DO) |
| Sensitivity Range | 0.04mg/L - 4mg/L (Alcohol) |
| Response Time | < 10 seconds |
| Recovery Time | < 30 seconds |
| Heater Voltage | 5V ± 0.2V |
| Load Resistance | 200kΩ (Adjustable) |
| Board Dimensions | 32mm x 20mm x 14mm |
Anonymous
Mar 30, 2026
Rating: 4/5
Works well but gets hot
Functionality is spot on for detecting alcohol concentration. Note that the heating element gets quite hot during operation, which is normal for this type of sensor, but ensure your enclosure has ventilation. Overall satisfied.
Anonymous
Mar 25, 2026
Rating: 4/5
Good sensitivity, needs warm-up
The sensor is very sensitive to ethanol vapors. Just remember that it needs about 2-3 minutes to warm up before giving accurate readings. Once heated, the response is quick. Documentation could be better, but plenty of tutorials exist online.
Anonymous
Mar 16, 2026
Rating: 3/5
Decent but requires calibration
The sensor works, but don't expect plug-and-play precision out of the box. You must spend time calibrating it in fresh air and then with a known alcohol source to get meaningful data. Good for hobbyists, maybe not for industrial use without extra work.
Anonymous
Mar 12, 2026
Rating: 5/5
Easy to interface with microcontrollers
Connected this to an ESP32 without any issues. The voltage levels are compatible, and the signal is clean. I used it to build a simple safety alarm for a home brewing setup, and it triggers reliably when ethanol levels rise.
Anonymous
Mar 04, 2026
Rating: 5/5
Reliable for classroom kits
We bought ten of these for our robotics club. They are robust and handle student handling well. The dual output (analog and digital) is excellent for teaching different ways to read sensor data with Arduino.
Anonymous
Mar 02, 2026
Rating: 5/5
Perfect for my breathalyzer prototype
This module works exactly as described. The analog output is stable after the initial warm-up period, and the digital threshold potentiometer makes it easy to calibrate for specific alcohol levels. Great value for electronics projects.
Q: Does this module come with headers soldered?
A: Yes, the module typically comes with the pin headers pre-soldered, ready for immediate use with breadboards or jumper wires.
Q: Is the digital output pin active high or active low?
A: The digital output (DO) state depends on your calibration via the onboard potentiometer. Typically, it goes LOW when the gas concentration exceeds the set threshold and HIGH when it is below the threshold, but this can be inverted by adjusting the comparator settings if your board supports it.
Q: How long does the sensor last before needing replacement?
A: Under normal operating conditions, the MQ-3 sensor element has a typical lifespan of 1 to 2 years in air. Continuous exposure to high concentrations of corrosive gases may reduce this lifespan.
Q: What is the power consumption of this sensor?
A: The heater inside the sensor consumes approximately 150mW to 200mW at 5V. Please ensure your power supply can provide at least 200mA to maintain stable operation.
Q: Can this detect methane gas as well?
A: While the MQ-3 is primarily optimized for alcohol and ethanol, it does have some cross-sensitivity to methane and other combustible gases. However, for dedicated methane detection, we recommend the MQ-4 or MQ-5 sensors for better accuracy.
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