MQ-2 Smoke Gas Sensor เซ็นเซอร์ตรวจจับควัน แก๊สมีเทน LPG/Smoke/CO

Gas may be used in homes and factories leakage monitoring device suitable for the detection of gas, butane , propane , methane , smoke , etc. 

 

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.

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

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 .

 

VCC: positive power supply (5V)

GND: power supply is negative

DO: TTL switching signal output

AO: analog signal output

 

Instructable : https://www.instructables.com/id/How-to-use-MQ2-Gas-Sensor-Arduino-Tutorial/