اینم کد مربوط به سنسور Magnetic switch
const int switchPin = 4 ;//etesale magnetic switch b payeye 4
const int Buzzer = 8 ;//etesale alarm b payeye 8
void setup() {
pinMode (switchPin,INPUT);//vorodi chon payeye 4 montazere dastore
pinMode(Buzzer, OUTPUT);//khoroji chon roye mohit biron asar mizare
digitalWrite(switchPin,HIGH);
}

void loop() {
if(digitalRead(switchPin) == LOW){
digitalWrite(Buzzer,LOW);
}
else{
digitalWrite(Buzzer,HIGH);
}
}