//For more Projects: www.arduinocircuit.com
/* In this example we will show how to select
the LED to turn on with two Up and Down buttons */
// Pin definition
int led1 = 11;
int led2 = 12;
int led3 = 13;
int buttonUp = 2;
int buttonDown = 3;
// Definition of the variables
int led = 1; // led to turn on
void setup() {
  // Set pins as outputs
  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT);
  pinMode (led3, OUTPUT);
  // Setting the pins as inputs
  pinMode(buttonUp, INPUT);
  pinMode (buttonDown, INPUT);
  // Enabling of the internal PullUp resistors on the inputs
  digitalWrite(buttonUp, HIGH);
  digitalWrite(buttonDown, HIGH);
}
void loop() {
  if (digitalRead (buttonUp) == 0){ // if the button is pressed
    led++; // Increment the led variable
    if (led>3) { // If the variable exceeds the value 3
      led=1; // Reset the variable to 1
    }
    delay(500); // Pause for debounce
  }
if (digitalRead (buttonDown) == 0){ // if the button is pressed
    led--; // Decrement the led variable
    if (led<1) { // If the variable is less than the value 1
      led=3; // Reset the variable to 3
    }
    delay(500); // Pause for debounce
   }
   if (led==1) {
    digitalWrite(led1, HIGH); // Turn on led1
    digitalWrite (led2, LOW); // Turn off led2
    digitalWrite (led3, LOW); // Turn off led3
   }
   if (led==2) {
    digitalWrite(led1, LOW); // Turn off led1
    digitalWrite(led2, HIGH); // Turn on led2
    digitalWrite (led3, LOW); // Turn off led3
   }
   if (led==3) {
    digitalWrite(led1, LOW); // Turn off led1
    digitalWrite (led2, LOW); // Turn off led2
    digitalWrite(led3, HIGH); // Turn on led3
   }
}