#define red 23
#define green 22
#define blue 19
#define yellow 18

void setup() {
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(26, INPUT); //red
  pinMode(27, INPUT); //green
  pinMode(14, INPUT); //blue
  pinMode(12, INPUT); //yellow
}

void loop() {
  int r = digitalRead(26);
  int g = digitalRead(27);
  int b = digitalRead(14);
  int y = digitalRead(12);
  if (r == 0) {
    digitalWrite(red, HIGH);
  }
  else {
    digitalWrite(red, LOW);
  }
  delay(100);
  if (g == 0) {
    digitalWrite(green, HIGH);
  }
  else {
    digitalWrite(green, LOW);
  }
  delay(100);
  if (b == 0) {
    digitalWrite(blue, HIGH);
  }
  else {
    digitalWrite(blue, LOW);
  }
  delay(100);
  if (y == 0) {
    digitalWrite(yellow, HIGH);
  }
  else {
    digitalWrite(yellow, LOW);
  }
  delay(50);
}