int Led = 13;
int shock = 3;
int val;
int i;


void setup() {
  pinMode(Led, OUTPUT);
  pinMode(shock, INPUT);
  Serial.begin(9600);

}

void loop() {
  
  val = digitalRead(shock);
  
  if (val == HIGH) { 
    digitalWrite(Led, LOW);
  } else {
    digitalWrite(Led, HIGH);
    i++;
    Serial.print("shock: ");
    Serial.println(i);
  }
  

}