int redLED = 18; // GPIO for red LED
int yellowLED = 19;// GPIO for yellow LED
int greenLED = 21; // GPIO for green LED
void setup() {
pinMode(redLED, OUTPUT);
pinMode(yellowLED, OUTPUT);
pinMode(greenLED, OUTPUT);
}
void loop() {
// Red light
digitalWrite(redLED, HIGH);
digitalWrite(yellowLED, LOW);
digitalWrite(greenLED, LOW);
delay(5000); // Wait for 5 seconds
// Yellow light
digitalWrite(redLED, LOW);
digitalWrite(yellowLED, HIGH);
digitalWrite(greenLED, LOW);
delay(2000); // Wait for 2 seconds
// Green light
digitalWrite(redLED, LOW);
digitalWrite(yellowLED, LOW);
digitalWrite(greenLED, HIGH);
delay(5000); // Wait for 5 seconds
}