MQ135 ammonia gas sensor, sulfide, benzene vapor high sensitivity, smoke and other harmful monitoring will also be ideal. The sensor can detect a variety of harmful gases, it is a low-cost sensors for a variety of applications.

• Features:

• Using high-quality dual-panel design,with power indicator and TTL signal output instructions.

• 
  

• The switching signal having a DO (TTL) output and analog output AO.

• 
  

• TTL output valid signal is low. ( Low-level signal when the output light can be directly connected to the microcontroller or relay module )

• 
  

• Analog output voltage with the higher concentration of higher voltage

• 
  

• There are four screw holes for easy positioning.

• 
  

• Has a long life and reliable stability

• 
  

• Rapid response and recovery characteristic

• 
  

Input voltage : DC5V Power consumption ( current ): 150mA

AO output :0.1-0 .3 V ( relative to pollution ),the maximum concentration of a voltage of about 4V

Special note: After the sensor is powered,needs to warm up around 20S,measured data was stable,heat sensor is a normal phenomenon,because the internal heating wire,if hot is not normal .

Wiring:

• 
  

• VCC: positive power supply (5V)

• 
  

• GND: power supply is negative

• 
  

• DO: TTL switching signal output

• 
  

• AO: analog signal output

  
  

•