int ledPin = 13;                // choose the pin for the LED
int inputPin = 11;               // Connect sensor to input pin 11
int val = 0;                    // variable for reading the pin status
void setup() {
 pinMode(ledPin, OUTPUT);      // declare LED as output
 pinMode(inputPin, INPUT);     // declare pushbutton as input
}
void loop(){
 val = digitalRead(inputPin);  // read input value
 if (val == HIGH) {            // check if the input is HIGH
   digitalWrite(ledPin, LOW);  // turn LED OFF
 } else {
   digitalWrite(ledPin, HIGH); // turn LED ON
 }
}