const int red1 = 2;
const int yellow1 = 3;
const int green1 = 4;

const int red2 = 5;
const int yellow2 = 6;
const int green2 = 7;

void setup() {
  pinMode(red1, OUTPUT);
  pinMode(yellow1, OUTPUT);
  pinMode(green1, OUTPUT);
  
  pinMode(red2, OUTPUT);
  pinMode(yellow2, OUTPUT);
  pinMode(green2, OUTPUT);
}

void loop() {
  // Direction 1 Green, Direction 2 Red
  digitalWrite(green1, HIGH);
  digitalWrite(red2, HIGH);
  delay(5000); // Green for 5 seconds
  
  // Direction 1 Yellow, Direction 2 Red
  digitalWrite(green1, LOW);
  digitalWrite(yellow1, HIGH);
  delay(2000); // Yellow for 2 seconds
  
  // Direction 1 Red, Direction 2 Red
  digitalWrite(yellow1, LOW);
  digitalWrite(red1, HIGH);
  delay(1000); // All red for 1 second
  
  // Direction 1 Red, Direction 2 Green
  digitalWrite(red2, LOW);
  digitalWrite(green2, HIGH);
  delay(5000); // Green for 5 seconds
  
  // Direction 1 Red, Direction 2 Yellow
  digitalWrite(green2, LOW);
  digitalWrite(yellow2, HIGH);
  delay(2000); // Yellow for 2 seconds
  
  // Direction 1 Red, Direction 2 Red
  digitalWrite(yellow2, LOW);
  digitalWrite(red2, HIGH);
  delay(1000); // All red for 1 second
  
  // Direction 1 Red off, reset for next cycle
  digitalWrite(red1, LOW);
  digitalWrite(red2, LOW);
}

O Level Exam : Practical Question

🖥 Output: