Keyestudio KS0077, Manual, Page: 102 / 142

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}
void loop()
{
byte state = digitalRead(sensorPin);
digitalWrite(indicator,state);
if(state == 1)Serial.println("Somebody is in this area!");
else if(state == 0)Serial.println("No one!");
delay(500);
}
//////////////////////////////////////////////////////////
Project 24: Analog Gas Sensor
Introduction
This analog gas sensor - MQ2 is used in gas leakage detecting equipment in consumer electronics
and industrial markets. This sensor is suitable for LPG, I-butane, propane, methane, alcohol,
Hydrogen and smoke detection. It has high sensitivity and quick response. In addition, the
sensitivity can be adjusted by the potentiometer.
Specification
Power Supply: 5V
Interface Type: Analog
Wide detecting scope
Quick response and high sensitivity
Simple drive circuit