int Led = 5 ;// define LED Interface
int buttonpin = 8; // define the mercury tilt switch sensor 
int val ;// define numeric variables val
void setup() {
  pinMode(Led, OUTPUT) ;// define LED as output 
  pinMode(buttonpin, INPUT) ;// define the mercury tilt switch sensor as input
}
void loop() {
  val = digitalRead(buttonpin) ;// read the values assigned to the digital 3 val
  if (val == HIGH) { // When the mercury tilt switch sensor detects a signal, LED flashes
    digitalWrite(Led, HIGH);
  } else {
    digitalWrite(Led, LOW);
  }
}