Description
Reviews
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Model | MQ-3 |
| Operating Voltage | 5V DC |
| Output Signal | Analog (AO) and Digital (DO) |
| Detection Gas | Alcohol, Ethanol, Methane |
| Concentration Range | 0.04mg/L - 4mg/L |
| Response Time | Less than 10 seconds |
| Operating Temperature | -10°C to 50°C |
| Module Dimensions | 32mm x 20mm x 15mm |
| Pin Interface | 4-Pin Header (VCC, GND, DO, AO) |
| Heater Voltage | 5V ± 0.1V |
Anonymous
Apr 04, 2026
Rating: 4/5
Good sensitivity
Detects alcohol vapor well. Had to tweak the threshold for my specific use case. Good value for the price.
Anonymous
Mar 13, 2026
Rating: 5/5
Easy to Integrate
Clear labeling on pins. Analog output is smooth. Verified purchase and fast delivery. Recommended for students.
Anonymous
Feb 01, 2026
Rating: 5/5
Great for Arduino Projects
Works perfectly with my Uno. Sensitivity is adjustable via the potentiometer. Just remember it needs warm-up time before stable readings.
Anonymous
Jan 25, 2026
Rating: 3/5
Gets quite hot
Works as expected but the sensor element gets very hot during operation. Normal for MQ series but worth noting for enclosed projects.
Anonymous
Jan 22, 2026
Rating: 5/5
Reliable Module
Solid build quality. Pins are well soldered. Using it for a safety alert system in my workshop.
Q: How long does it need to warm up?
A: We recommend preheating for 24 hours for stable baseline readings, though it responds to gas within seconds.
Q: Is this accurate enough for legal breathalyzing?
A: No, this is for educational and hobbyist purposes only. It is not calibrated for legal, medical, or law enforcement use.
Q: Can I use this with 3.3V logic microcontrollers?
A: The module operates at 5V, but the analog output can be read by 3.3V microcontrollers with proper voltage scaling or a divider.
Q: What is the typical lifespan of the sensor?
A: Typically 1-2 years in normal conditions, depending on exposure to high concentrations and operating environment.
Q: Does it have both analog and digital output?
A: Yes, it provides an analog voltage output proportional to concentration and a digital TTL output with an adjustable threshold.
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