The geeekus high quality MQ-2 Gas Vapor Sensor module is useful for gas leakage detection for home and industry. The MQ-2 sensor not only can detect gas or smoke, but can also detect LPG, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide.. The sensitivity of the sensor can be adjusted by potentiometer.
Specifications:
- Power Supply: 5V
- Interface Type: Analog
- Wide detecting scope
- Quick response and High sensitivity
- Simple drive circuit
- Stable and long lifespan
Calibrating the MQ2 Gas Sensor:
Because the MQ2 is a heater-driven sensor, the calibration of the sensor may drift if it is left in storage for an extended period of time.
When first used after a long period of storage (a month or more), the sensor must be fully warmed up for 24-48 hours to ensure maximum accuracy.
If the sensor has recently been used, it will only take 5-10 minutes to fully warm up. During the warm-up period, the sensor typically reads high and gradually decreases until it stabilizes.
The MQ-2 Gas detection sensor module has four pins GND, VCC, DO, and AO that allow you to get the proper information out of the sensor.
The pinout of the MQ-2 Gas detection sensor is:
GND is the ground pin of the board and it should be connected to the ground pin of the Arduino.
VCC is the power supply pin of the Gas Detection Sensor that can be connected to 5V of the supply.
DO is the Digital output pin of the board, output low indicates gas or smoke is not present in the atmosphere and output high indicates gas or smoke is present in the atmosphere.
AO is the Analog output pin of the board that will give us an analog signal which will vary between vcc and ground based on the gas level detected
Sample Code
///Arduino Sample Code
void setup()
{
Serial.begin(9600); //Set serial baud rate to 9600 bps
}
void loop()
{
int val;
val=analogRead(0);//Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
delay(100);
}
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