#define RED1 0
#define YELLOW1 1
#define GREEN1 2

#define RED2 15
#define YELLOW2 14
#define GREEN2 13

#define RED3 16
#define YELLOW3 17
#define GREEN3 18

#define RED4 28
#define YELLOW4 27
#define GREEN4 26

void setup() {
  pinMode(RED1, OUTPUT);
  pinMode(YELLOW1, OUTPUT);
  pinMode(GREEN1, OUTPUT);
  
  pinMode(RED2, OUTPUT);
  pinMode(YELLOW2, OUTPUT);
  pinMode(GREEN2, OUTPUT);
  
  pinMode(RED3, OUTPUT);
  pinMode(YELLOW3, OUTPUT);
  pinMode(GREEN3, OUTPUT);
  
  pinMode(RED4, OUTPUT);
  pinMode(YELLOW4, OUTPUT);
  pinMode(GREEN4, OUTPUT);
  
}

void loop() {
  digitalWrite(GREEN1, HIGH);
  digitalWrite(YELLOW2, HIGH);
  digitalWrite(RED3, HIGH);
  digitalWrite(RED4, HIGH);
  delay(6000);

  digitalWrite(GREEN1, LOW);
  digitalWrite(YELLOW2, LOW);
  digitalWrite(RED3, LOW);

  digitalWrite(RED1, HIGH);
  digitalWrite(GREEN2, HIGH);
  digitalWrite(YELLOW3, HIGH);
  delay(6000);

  digitalWrite(GREEN2, LOW);
  digitalWrite(YELLOW3, LOW);
  digitalWrite(RED4,LOW);

  digitalWrite(RED2, HIGH);
  digitalWrite(GREEN3, HIGH);
  digitalWrite(YELLOW4, HIGH);
  delay(6000);

  digitalWrite(RED1, LOW);
  digitalWrite(GREEN3, LOW);
  digitalWrite(YELLOW4, LOW);

  digitalWrite(YELLOW1, HIGH);
  digitalWrite(RED3, HIGH);
  digitalWrite(GREEN4, HIGH);
  delay(6000);

  digitalWrite(YELLOW1, LOW);
  digitalWrite(RED3, LOW);
  digitalWrite(GREEN4, LOW);
  digitalWrite(RED2,LOW);

}




// void setup() {
//   // put your setup code here, to run once:
//   Serial1.begin(115200);
//   Serial1.println("Hello, Raspberry Pi Pico!");
// }

// void loop() {
//   // put your main code here, to run repeatedly:
//   delay(1); // this speeds up the simulation
// }