A
Anonymous
Apr 12, 2026
Rating: 5/5
Great for Arduino Projects
Works perfectly with my Uno. Easy to wire up and read values.
Description
MQ-135 Air Quality Sensor - 22 years of component expertise
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Operating Voltage | 5V DC |
| Interface Type | Analog & Digital Output |
| Sensing Gases | NH3, NOx, Alcohol, Benzene, Smoke, CO2 |
| Initial Preheat Time | 24-48 Hours |
| Heater Voltage | 5.0V ± 0.1V |
| Heater Current | 150mA |
| Load Resistance | 20KΩ (Adjustable) |
| Module Dimensions | 32mm x 20mm x 15mm |
| Operating Temperature | -10°C to 50°C |
| Pin Configuration | 4 Pins (VCC, GND, DO, AO) |
5 reviews
A
Anonymous
Mar 09, 2026
Rating: 5/5
Fast Delivery
Arrived quickly and well packaged. Sensor is responsive to smoke tests.
A
Anonymous
Mar 07, 2026
Rating: 4/5
Good sensor, needs calibration
Reads well after warming up. Make sure to calibrate for your specific environment.
A
Anonymous
Mar 06, 2026
Rating: 3/5
Sensitivity varies
It works but values fluctuate a lot. Needs a very stable power supply.
A
Anonymous
Feb 19, 2026
Rating: 5/5
Perfect for ventilation control
Using this to trigger fans when air quality drops. Works as expected for hobby use.
5 FAQ
Q: Can I use this with Raspberry Pi?
A: Yes, via the analog pin using an ADC or the digital pin directly.
Q: Is there a library available?
A: Yes, many community libraries exist for Arduino and ESP8266.
Q: How long until it stabilizes?
A: We recommend 24-48 hours initial preheat, then 1-2 minutes before readings.
Q: Is this compatible with 3.3V logic?
A: The module operates at 5V, but analog output can be read by 3.3V boards with caution.
Q: Does this measure CO2 ppm accurately?
A: It detects CO2 presence but is not a precision NDIR CO2 meter.
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