MQ-135 sensor module for

MQ-135 sensor module for Air quality and hazardous gas detection

MQ-135 Sensor Description:
MQ135 gas sensor is sensitive material used in clean air, low conductivity tin dioxide (SnO2). When the sensor is kept in their environment
The contaminated gas, the conductivity of the sensor with the air pollution gas concentration increases. Using a simple circuit can be changes in the conductivity
Of the concentration of the gas is converted to the corresponding output signal.
MQ135 sensor for ammonia, sulfide , benzene vapor high sensitivity, smoke and other harmful monitor is also very satisfactory. This sensor can detect a
Measuring a variety of harmful gases , is a low-cost sensors for a variety of applications .

Module Applications:
For home , environmental harmful gas detection device , suitable for ammonia , aromatic compounds , sulfur , benzene vapor , smoke and other gases harmful gas detection, gas sensors tested concentration range : 10 to 1000ppm

Module Features :
1 , using high-quality dual-panel design, with power indicator and TTL signal output instructions ;
2, with a DO switch signal (TTL) output and AO analog signal output ;
3, TTL output valid signal is low . ( When the output low signal light can be directly connected microcontroller or relay module )
4 , the analog output voltage , the higher the concentration the higher the voltage .
5 , the air quality, hazardous gas detection with better sensitivity .
6 , there are four screw holes for easy positioning ;
7 , Product Dimensions : 32 (L) * 20 (W) * 22 (H)
8, with a long service life and reliable stability
9 , rapid response and recovery characteristics

Electrical properties:
Input voltage: DC5V power ( current ): 150mA
DO output : TTL digital 0 and 1 ( 0.1 and 5V)
AO output :0.1-0 .3 V ( relatively clean ) , the highest concentration of voltage around 4V
Special note : The sensor is powered, needs to warm up around 20S , measured data becomes stable , the sensor fever is a normal phenomenon, because the internal heating wire , if hot is not normal.

Wiring:
1, VCC: positive power supply (5V)
2, GND: tied to power supply
3, DO: TTL switching signal output
4, AO: analog output