Description:

Sensitive material MQ-3 gas sensor is used in clean air low conductivity tin oxide (SnO2). When there is alcohol vapor in the environment sensor, conductivity sensor with increasing gas concentration of alcohol in the air increases. Use simple circuit can convert the change in conductivity of the gas concentration corresponding to the output signal. High MQ-3 gas sensor sensitivity to alcohol, can resist the interference of gasoline, smoke, water vapor. The sensor can detect a variety of alcohol concentration in the atmosphere, is a low-cost sensor suitable for a variety of applications.

شرح :

Note:

VCC: positive power supply (5V)

GND: power supply is negative

DO: TTL switching signal output

AO: analog signal output

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

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 .

Kit include:

1 * MQ-3 Alcohol Sensor Module