A
Anonymous
Mar 29, 2026
Rating: 5/5
Reliable module
Used MQ-5 for LPG detection in a prototype. Very stable output.
Description
Full Specifications with High Sensitivity
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Operating Voltage | 5V DC |
| Heating Voltage | 5.0V ± 0.1V |
| Load Resistance | Adjustable (20kΩ default) |
| Heating Resistance | 33Ω ± 5% |
| Sensing Resistance | 10kΩ - 60kΩ |
| Preheat Time | 24-48 Hours |
| Operating Temperature | -10°C to 50°C |
| Output Type | Analog (AO) & Digital (DO) |
| Pin Interface | 4-Pin Header (VCC, GND, DO, AO) |
| PCB Dimensions | 32mm x 20mm |
5 reviews
A
Anonymous
Feb 12, 2026
Rating: 5/5
Great for Arduino Projects
Works perfectly with my Uno. Calibrated well after 24 hours.
A
Anonymous
Jan 29, 2026
Rating: 4/5
Good sensitivity
Detects smoke well. Wish the potentiometer was easier to adjust.
A
Anonymous
Jan 26, 2026
Rating: 5/5
Exactly as described
Bought the MQ-135 for air quality. Readings are consistent.
A
Anonymous
Jan 18, 2026
Rating: 3/5
Needs patience
Takes a long time to warm up. Make sure you read the datasheet.
5 FAQ
Q: How long before it's accurate?
A: We recommend 24-48 hours initial preheat for stable readings.
Q: Can this run on 3.3V logic?
A: The sensor needs 5V heating, but AO can be read by 3.3V MCUs with caution.
Q: Can MQ-2 detect Carbon Monoxide?
A: MQ-2 is primarily for smoke/LPG. Use MQ-7 for Carbon Monoxide.
Q: Is the DO pin adjustable?
A: Yes, use the onboard potentiometer to set the threshold trigger.
Q: Does it output ppm directly?
A: No, it outputs voltage proportional to concentration. You need to calibrate for ppm.
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