const int pinApi = 10;
const int pinAlarm = 3;
int data;

void setup()
{
pinMode(pinApi, INPUT); 
pinMode(pinAlarm, OUTPUT); 
}

void loop()
{
data = digitalRead(pinApi);
if (data == LOW)
{
digitalWrite(pinAlarm, HIGH);
delay(100);
}

else
{
digitalWrite(pinAlarm, LOW);
delay(100);
}
}