Shopping Cart

MQ135 - Air Quality Gas Sensor Module

  1. Sensitivity to Ammonia, Sulphide and Benzene steam
  2. Sensitive for benzene, alcohol, smoke
  3. Fast response and High sensitivity
  4. Adjustable sensitivity
  5. Operating Voltage is +5V
  6. Wide detecting scope
  7. Analog output voltage: 0V to 5V
  8. Digital output voltage: 0V or 5V (TTL Logic)
  9. Preheat duration 20 seconds
  10. Can be used as a Digital or analog sensor

150.00 127.12+18% GST

In stock

SKU 04AA007 Categories ,

15 days easy return and money back guarantee.

Free shipping on all orders above ₹ 999.

Share on facebook
Share on linkedin
Share on twitter
Share on whatsapp


MQ135 – Air Quality Gas Sensor Module

The MQ-135 Gas sensors are used in air quality control equipment and are suitable for detecting or measuring of NH3, NOx, Alcohol, Benzene, Smoke, CO2. The MQ-135 sensor module comes with a Digital Pin which makes this sensor operate even without a microcontroller and that comes in handy when you are only trying to detect one particular gas.

If you need to measure the gases in PPM the analog pin needs to be used. The analog pin is TTL driven and works on 5V and so can be used with most common microcontrollers. (Find out a wide range of sensors at

When the target combustible gas exists, the conductivity of the sensor is higher along with the gas concentration rising. Convert change of conductivity to the corresponding output signal of gas concentration.

The MQ135 gas sensor has a high sensitivity to Ammonia, Sulphide and Benzene steam, also sensitive to smoke and other harmful gases.

It is available at a low cost and suitable for different applications such as harmful gas/smoke detection.

Pin Configuration


Pin No: Pin Name: Description
For Module
1 Vcc Used to power the sensor, Generally, the operating voltage is +5V.
2 Ground Used to connect the module to the system ground.
3 Digital Out You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer.
4 Analog Out This pin outputs 0-5V analog voltage based on the intensity of the gas.
For Sensor
1 H -Pins Out of the two H pins, one pin is connected to supply and the other to the ground
2 A-Pins The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.
3 B-Pins Pins and B pins are interchangeable. One pin will act as output while the other will be pulled to the ground.

Features :

  1. Wide detecting scope
  2. Fast response and High sensitivity
  3. Stable and long life
  4. Operating Voltage is +5V
  5. Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
  6. Analog output voltage: 0V to 5V
  7. Digital output voltage: 0V or 5V (TTL Logic)
  8. Preheat duration 20 seconds
  9. Can be used as a digital or analog sensor
  10. The Sensitivity of Digital pin can be varied using the potentiometer


  • Used to detect leakage/excess of gases like Ammonia, nitrogen oxide, alcohols, aromatic compounds, sulfide, and smoke.
  • Air quality monitors.

Package Includes :

1 x MQ 135Air Quality Sensor Module. Click here to download the datasheet of MQ135.

Learn how to interface a MQ135 gas sensor with an Arduino.


IC Chip MQ-135
Operating Voltage(VDC) 5
Detecting Range 100ppm to 1000ppm
Power consumption (current) 150mA
AO output 0.1-0.3V (relatively non-polluting), the highest concentration voltage is about 4V
Detection of gas NH3, NOx, alcohol, Benzene, smoke, CO2


There are no reviews yet.

Be the first to review “MQ135 – Air Quality Gas Sensor Module”

Your email address will not be published.

Free shipping

On all orders above ₹999

Easy 15 days returns

15 days money back guarantee

100% Secure Checkout

UPI / Credit Card / Debit Card