#define Pyr 3


void setup() {
pinMode(Pyr,INPUT);
attachInterrupt(digitalPinToInterrupt(Pyr),detection,CHANGE);
Serial.begin(9600);
}

void loop() {
}

void detection(){
  if(digitalRead(Pyr)==HIGH){  
   Serial.println("Motion detect");
  }
  else{
   Serial.println("No Motion");    
  }
}