//Lab4 Arduino_Switch_1LED
#define LED 2 
#define SW1 4 
#define pressed LOW  // switch input Active Low
void setup() {
// initialize digital pin LED_BUILTIN as an output.
Serial.begin(9600);
pinMode(LED, OUTPUT);
pinMode(SW1, INPUT);
}

// the loop function runs over and over again forever
void loop() {
   int value = digitalRead((SW1));
  if (value == pressed)
{
Serial.println("Pressed Switch.");
delay(10);
digitalWrite(LED, HIGH);
}
else 
{
 digitalWrite(LED, LOW); 
}
}