MQ135 SENSOR
- Operating Voltage: 3.3 – 5V.
- Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
- Analog output voltage: 0V to 5V
- Digital output voltage: 0V or 5V (TTL Logic)
- Detection range:10 ppm-300 ppm NH3, 10 ppm-1000 ppm Benzene, 10 ppm-300 ppm Alcohol
- Heating voltage (high): 5V ± 0.1
- Heating voltage (low): 1.4V ± 0.1
- Load resistance: Adjustable
- Heating resistance: 33Ω ± 5%
- Heating consumption: less than 800mW
- Detection temperature: 20℃±2℃
- Relative humidity: 65%+-5%RH
- Preheat duration 20 seconds
- Can be used as a digital or analogue sensor
- Â The sensitivity of Digital pin can be varied using the potentiometer
- It has a long life and low cost.
- Possesses high sensitivity to ammonia, benzene, sulfide gases.
- simple drive circuit