MQ135 Air Quality Control Gas Sensor
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 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 ground |
2 | A-Pins | The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage. |
3 | B-Pins |
|
MQ-135 Sensor 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
Alternative MQ Gas sensors
Sensor Name | Gas to measure |
Methane, Butane, LPG, Smoke | |
MQ-3 | Alcohol, Ethanol, Smoke |
MQ-4 | Methane, CNG Gas |
MQ-5 | Natural gas, LPG |
MQ-6 | LPG, butane |
MQ-7 | Carbon Monoxide |
MQ-8 | Hydrogen Gas |
MQ-9 | Carbon Monoxide, flammable gasses |
MQ131 | Ozone |
MQ135 | Air Quality |
MQ136 | Hydrogen Sulphide gas |
MQ137 | Ammonia |
MQ138 | Benzene, Toluene, Alcohol, Propane, Formaldehyde gas, Hydrogen |
MQ214 | Methane, Natural Gas |
MQ216 | Natural gas, Coal Gas |
MQ303A | Alcohol, Ethanol, smoke |
MQ306A | LPG, butane |
MQ307A | Carbon Monoxide |
MQ309A | Carbon Monoxide, flammable gas |