Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-135 |
| Detection Gases | Ammonia, Sulfide, Benzene, Smoke, CO2 |
| Operating Voltage | 5V DC |
| Output Signal | Analog and Digital (TTL) |
| Heater Voltage | 5.0V ± 0.2V |
| Load Resistance | Adjustable via Potentiometer |
| Preheat Time | Over 24 hours for stability |
| Interface Type | 3-Pin Header (VCC, GND, OUT) |
| PCB Dimensions | 32mm x 20mm |
| Application | Air Quality Monitoring Systems |
Anonymous
Mar 31, 2026
Rating: 4/5
Good value but needs calibration
The module is well-built and the potentiometer makes it easy to adjust sensitivity. Just remember it takes a day or two to stabilize readings accurately.
Anonymous
Mar 27, 2026
Rating: 5/5
Perfect for ventilation control
Integrated this into my greenhouse ventilation system to monitor ammonia levels. It has been running continuously for weeks without issues.
Anonymous
Mar 26, 2026
Rating: 3/5
Works but gets hot
The sensor functions correctly, but the heating element gets quite warm, which is normal for this type but worth noting for enclosed cases.
Anonymous
Mar 24, 2026
Rating: 5/5
Reliable gas detection
I used this to detect smoke and cooking fumes in my kitchen prototype. It reacts quickly to changes in air quality. Highly recommended for hobbyists.
Anonymous
Mar 17, 2026
Rating: 5/5
Great for Arduino projects
This sensor works perfectly with my Arduino Uno. The analog output is stable after the initial preheat time. Easy to integrate into home air quality monitors.
Anonymous
Mar 16, 2026
Rating: 4/5
Solid performance
Works as described. The digital output threshold is adjustable which is a nice feature. Make sure you have a proper 5V power supply.
Q: How long does the preheat time really need to be?
A: For accurate and stable readings, we recommend a preheat time of at least 24 to 48 hours. Initial readings may fluctuate significantly before this period.
Q: Can this detect Carbon Monoxide (CO)?
A: The MQ-135 is primarily sensitive to Ammonia, Sulfide, and Benzene. While it has some sensitivity to CO, the MQ-7 sensor is specifically designed for Carbon Monoxide detection.
Q: Is the library available for Raspberry Pi?
A: Yes, since it outputs an analog signal, you will need an ADC (Analog-to-Digital Converter) chip like the MCP3008 to interface with the Raspberry Pi GPIO pins.
Q: What is the lifespan of the heating element?
A: Under normal operating conditions, the heating element typically lasts for several years. Continuous operation within the specified voltage range ensures maximum longevity.
Q: Does this module work with 3.3V microcontrollers like ESP32?
A: Yes, but you may need a voltage divider or level shifter for the output signal since the sensor operates at 5V. The heater specifically requires 5V.
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