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Overview
Sensitive material MQ-7 gas sensors used in clean air, low conductivity tin oxide (SnO2). High-low temperature cycling detection mode (1.5V heating) carbon monoxide detector, conductivity sensor with the increasing concentration of carbon monoxide gas in the air increases,high-temperature (5.0V heating) cleaning cryoadsorption stray gases. Using a simple circuit to change the conductivity, concentration of the gas is converted to the corresponding output signal. MQ-7 gas sensor of 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.
Application
Can be used for home and factory gas leakage monitoring devices, suitable for liquefied petroleum gas, butane, propane, methane, smoke, etc.
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
Specifications
Input voltage:DC5V Power consumption ( current ):150mA
DO output:TTL digital 0 and 1 ( 0.1 and 5V)
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
NOTE
After the sensor is powered, need to warm about 20S, measured data becomes stable, heat sensor is normal
Package Included
5 x MQ-7 MQ7 Carbon Monoxide CO Gas Sensor Detection Module
Additional information
| Weight | 0.012 kg |
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