Description: MQ-7 Carbon Monoxide Sensor Module

MQ-7 gas sensor used by the gas-sensitive material is in conductivity of Clean Air under tin oxide (snO2) test of high temperature cycle and low heat of low temperature (1.5V) carbon monoxide, conductivity of the sensor increases with an increasing concentration of carbon monoxide gas in the air, high temperature to wash the low temperature heat (5.0 V) adsorption of street gas. The use of a simple circuit may be the change in conductivity, converted to correspond to the gas concentration of the output.

Features:

• Low Cost

• High Sensitivity toCarbon Monoxide (CO) gas

• Flat Response

• Stable and Long Life

• Both Digital and Analog Outputs

• On-board LED Indicator

Specifications:

• Main chip:MQ-7 gas sensor
• Working Voltage: 5V DC
• Detecting Vary:100 to 10000ppm
• TTL output valid signal is low
• Anolog output

Pinout:

• VCC (+5V)
• GND (0V)
• DO (Digital Out)
• AO (Analog Out)

Note:

When the Sensor is powered, it needs to be warmed up about 20 seconds. So the measured data become stable, the heat sensor is a normal phenomenon. Its inside is included heating wire, but if too hot, it is abnormal.

Documents:

• MQ-7
• Wiring Example

Package Includes :

• 1 x MQ-7 CO Carbon Monoxide Coal Gas Sensor Module

• Main chip:MQ-7 gas sensor
• Working Voltage: 5V DC
• Detecting Vary:100 to 10000ppm
• TTL output valid signal is low
• Anolog output