5Pcs MQ-7 MQ7 Carbon Monoxide CO Gas Sensor Module

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Overview:Sensitive material MQ-7 gas sensors used in clean air, low conductivity tin oxide (SnO2). High-low temperature cycling 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, , propane, methane, , etc.Features:- Using high-quality dual-panel design,with 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 characteristicSpecifications:Input voltage : DC5V consumption ( current ): 150mADO 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 4VSpecial 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 supply (5V)GND: supply is negativeDO: TTL switching signal outputAO: analog signal outputNOTE:After the sensor is powered, need to warm about 20S, measured data becomes stable, heat sensor is normalPackage Included:5 x MQ-7 MQ7 Carbon Monoxide CO Gas Sensor Module






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