trafficlight.txt

int R1 = 8;
int G1 = 10;
int Y1 = 9;

int R2 = 13;
int Y2 = 12;
int G2 = 11;

int R3 = 5;
int Y3 = 6;
int G3 = 7;

int G4 = 4;
int R4 = 2;
int Y4 = 3;

void setup() {
  pinMode(R1, OUTPUT);
  pinMode(Y1, OUTPUT);
  pinMode(G1, OUTPUT);
  
  pinMode(R2, OUTPUT);
  pinMode(Y2, OUTPUT);
  pinMode(G2, OUTPUT);
  
  pinMode(R3, OUTPUT);
  pinMode(Y3, OUTPUT);
  pinMode(G3, OUTPUT);
  
  pinMode(R4, OUTPUT);
  pinMode(Y4, OUTPUT);
  pinMode(G4, OUTPUT);
}


void loop()  {
  digitalWrite(G1,HIGH);
  digitalWrite(R2,HIGH);
  digitalWrite(R3,HIGH);
  digitalWrite(R4,HIGH);
  delay(8000);
  digitalWrite(G1,LOW);     
   
  digitalWrite(Y1,HIGH);
  delay(2000);
  digitalWrite(R2,LOW);
    
   
  digitalWrite(G2,HIGH);
  digitalWrite(R3,HIGH);
  digitalWrite(R4,HIGH);
  digitalWrite(R1,HIGH);
  delay(8000);
  digitalWrite(G2,LOW);     
   
  digitalWrite(Y2,HIGH);
  delay(2000);
  digitalWrite(Y2,LOW);
  
  digitalWrite(R2,LOW);
  digitalWrite(R3,LOW);
  digitalWrite(G3,HIGH);
  digitalWrite(R1,HIGH);
  digitalWrite(R2,HIGH);
  digitalWrite(R4,HIGH);
  delay(8000);
  digitalWrite(G3,LOW);     
   
  digitalWrite(Y3,HIGH);
  delay(2000);
  digitalWrite(Y3,LOW);
  
  digitalWrite(R4,LOW);
  digitalWrite(G4,HIGH);
  digitalWrite(R1,HIGH);
  digitalWrite(R2,HIGH);
  digitalWrite(R3,HIGH);
  delay(8000);
  digitalWrite(G4,LOW);     
   
  digitalWrite(Y4,HIGH);
  delay(2000);
  digitalWrite(Y4,LOW);
}