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
MQ2 module
- Interface Type: Analog & Digital
- Working voltage: DC 5V
- Working Current: 150mA
- DOUT: TTL output
- AOUT: Analog output
- Preheat time: Over 20s
- Detection Range: 300 -10000 ppm
- Sensitive to H2, LPG, CH4, CO, Alcohol, Smoke or Propane,
- Digital Out is High or Low based on an adjustable preset threshold,
- High Sensitivity to Smoke & combustible gasses like Hydrogen, LPG & Propane.
- Stable & Long Life.
- Onboard Power indication
- The TTL output signal is a low level
- Analog 0 ~ 5 v voltage output, the higher the concentration, the higher the voltage
- Fast response and recovery
- Adjustable sensitivity
- Dimension: 32mm x 22m x 27mm
MQ2 Sensor
- Operating Voltage: +5V
- Can be used to Measure or detect LPG, Alcohol, Propane, Hydrogen, CO, and even methane
- Analogue output voltage: 0V to 5V
- Digital Output Voltage: 0V or 5V (TTL Logic)
- Preheat duration 20 seconds
- Can be used as a digital or analogue sensor
- Load resistance: 20 KΩ
- Heater resistance: 33Ω ± 5%
- Heating consumption: <800mw
- Sensing Resistance: 10 KΩ – 60 KΩ
- Detection range: 200 – 10000ppm
- Preheat Time: Over 24 hour
- High sensitivity to LPG, Propane, and Hydrogen
- The Sensitivity of a Digital pin can be varied using the potentiometer