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