/*
 * LED - tip
 */
 
int led1 = 6; 
int tip1 = A0; 

void setup() {                
  pinMode(led1, OUTPUT);
  pinMode(tip1, INPUT);  
}

void loop() {
  if (digitalRead(tip1) == LOW)
  {
  digitalWrite(led1, HIGH);
  }
  else
  {
  digitalWrite(led1, LOW); 
  }
}