Intruder Detection System Using PIR and ISD1820

Circuit:-

 

Code:- 

int pir = 8;

int speaker = 9;

void setup()

{

  

pinMode(pir,INPUT);

pinMode(speaker,OUTPUT);

}

void loop()

{

  if(digitalRead(pir)==1)

  {

    digitalWrite(9,HIGH);

  }

  else

  {

     digitalWrite(9,LOW);

  }

}