/*
Traffic Lights Timing:
- RED: 20 seconds
- YELLOW: 5 seconds
- GREEN: 20 seconds

Pins Setup:
            Robot 1
            Pin 8 = Red
            Pin 9 = Yellow
            Pin 10 = Green
*/

void setup() {
  DDRB = B11111111; // Set Arduino pins 8 to 13 as outputs
}

void loop() {
  // Step 1: RED Lights ON (20 seconds)

  digitalWrite(8, HIGH); // Robot 1 Red ON
  digitalWrite(9, LOW);  // Robot 1 Yellow OFF
  digitalWrite(10, LOW); // Robot 1 Green OFF
  delay(20000);          // 20 seconds delay

  // Step 2: YELLOW Lights ON (5 seconds)
 
  digitalWrite(8, LOW);  // Robot 1 Red OFF
  digitalWrite(9, HIGH); // Robot 1 Yellow ON
  digitalWrite(10, LOW); // Robot 1 Green OFF
  delay(5000);           // 5 seconds delay

  // Step 3: GREEN Lights ON (20 seconds)

  digitalWrite(8, LOW);  // Robot 1 Red OFF
  digitalWrite(9, LOW);  // Robot 1 Yellow OFF
  digitalWrite(10, HIGH); // Robot 1 Green ON
  delay(20000);           // 20 seconds delay
}