MQ-7 sensor module for carbon monoxide d...

MQ-7 sensor module for carbon monoxide detector


Sensor MQ-7 Description:

MQ-7 gas sensor is sensitive material used in clean air, low conductivity tin dioxide (SnO2). Detection method using low temperature cycling (1.5V heating ) detect carbon monoxide, airborne sensor conductivity increases with the increase of the concentration of carbon monoxide gas , high temperature (5.0V heating ) cleaning stray gas adsorption at low temperature . Using a simple circuit can be changes in the conductivity , concentration of the gas is converted to the corresponding output signal. MQ-7 gas sensor with high sensitivity for carbon monoxide , this sensor can detect a variety of gases containing carbon monoxide , is a low-cost sensors for a variety of applications,

Module Applications:
For home , carbon monoxide detection device environment . Suitable for carbon monoxide and gas detection .

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 carbon monoxide 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.