How To Use PIR Motion Sensor With Arduino + Upload Programme Code in Arduino Onu
When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves. When the warm body leaves the sensing area, the reverse happens, whereby the sensor generates a negative differential change. These change pulses are what is detected.
int pir = 7;
int buz =8;
int state;
void setup()
{
pinMode (pir, INPUT);
pinMode (buz, OUTPUT);
}
void loop()
{
state = digitalRead (pir);
digitalWrite (buz, state);
}
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