Chip: LM393, ZYMQ-2 Gas Sensors.
Working Voltage: 5V DC.
Current: 150 mA.
Pin Definition: 1-Output, 2-GND, 3-VCC.
Dual Signal output: Analog output and TTL level output.
DO Output: TTL digital quantity 0 and 1 (0.1 and 5V).
AO output: 0.1-0.3v (relatively pollution-free), the highest concentration voltage is about 4V.
Gas Detection: LPG, i-butane, propane, methane, alcohol, hydrogen and smoke.
The MQ2 sensor is used to detect combustible and harmful gases for consumer and industrial applications, the gases this sensor can detect are: LPG, i-butane, propane, methane, alcohol, hydrogen and smoke, these gases are not only highly combustible but also harmful.
The sensitivity of the MQ2 sensor can be adjusted to suit the requirements of the application via a manual potentiometer located on the back of the sensor.
The output voltage from the Gas sensor increases when the concentration of gas increases.
sing high-quality dual-panel design, with power indicator and TTL signal output instructions;
The switching signal has a DO (TTL) output and analogue 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 )
Analogue output voltage with the higher concentration of higher voltage.
A gas, natural gas, city gas, smoke better sensitivity.
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
After the sensor is powered, needs to warm up around the 20S, measured data was stable, 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: analogue signal output