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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