MQ-7 GAS SENSOR BRICK

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*Disclaimer: The images are merely illustrative.

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
•     Dimensions 32x20mm

Board:

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 became stable after that, heat sensor is a normal phenomenon, because the internal heating wire, if hot is not normal .

•     VCC: positive power supply (5V)
•     GND: power supply is negative
•     DO: TTL switching signal output
•     AO: analog signal output