int red_led = 5; // red LED
int green_led = 6; // green LED
int blue_led = 7; // red LED
int red = 2;    // red button
int green = 3; // green button
int blue = 4; // blue button
int val = 0;     // variable for reading the pin status
int red_on = 0;
int green_on = 0;
int blue_on = 0;

void setup() {
  pinMode(red_led, OUTPUT);     // output
  pinMode(green_led, OUTPUT);  // output
  pinMode(blue_led, OUTPUT);  // output
  pinMode(red, INPUT);       // input
  pinMode(green, INPUT);    // input
  pinMode(blue, INPUT);    // input
}

void loop(){
  // red
  val = digitalRead(red);  // read input value
  if (val == HIGH) {         // check if the button is pressed
    if (red_on == 0) {
      red_on = 1;
      digitalWrite(red_led, HIGH);  // turn LED on
      delay(50);                  // pause to let button unpress
    } else if (red_on == 1) {
      red_on = 0;
      digitalWrite(red_led, LOW);  // turn LED off
      delay(500);                  // pause to let button unpress
    }
  }
  // green
    val = digitalRead(green);  // read input value
  if (val == HIGH) {         // check if the button is pressed
    if (green_on == 0) {
      green_on = 1;
      digitalWrite(green_led, HIGH);  // turn LED on
      delay(50);                  // pause to let button unpress
    } else if (green_on == 1) {
      green_on = 0;
      digitalWrite(green_led, LOW);  // turn LED off
      delay(50);                  // pause to let button unpress
    }
  }
  // blue
  val = digitalRead(blue);  // read input value
  if (val == HIGH) {         // check if the button is pressed
    if (blue_on == 0) {
      blue_on = 1;
      digitalWrite(blue_led, HIGH);  // turn LED on
      delay(500);                  // pause to let button unpress
    } else if (blue_on == 1) {
      blue_on = 0;
      digitalWrite(blue_led, LOW);  // turn LED off
      delay(500);                  // pause to let button unpress
    }
  }
}