void setup() {
  // put your setup code here, to run once:
  pinMode(12, OUTPUT);

}
/*signal - 2 type
digital - 0 or 1 - 100% or 0% so we always use motion sensor 
analog - keep changing and is not contant with same digits so it keep changing
*/
void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(7) == HIGH){
    digitalWrite(12, HIGH);
    delay(3000);
    digitalWrite(12, LOW);
  }
}