1#define R 14  //Define the pin for the red light of the traffic light
 2#define Y 2   //Define the pin for the yellow light of the traffic light
 3#define G 0   //Define the pin for the green light of the traffic light
 4
 5void setup() {
 6  pinMode(R, OUTPUT);  //Set the red light pin to output mode
 7  pinMode(Y, OUTPUT);  //Set the yellow light pin to output mode
 8  pinMode(G, OUTPUT);  //Set the green light pin to output mode
 9}
10
11void loop() {
12  Traffic_Light(0, 0, 1);  //Green light on
13  delay(2000);             //Delay 2 seconds
14  Traffic_Light(0, 1, 0);  //Yellow light on
15  delay(1000);             //Delay 1 seconds
16  Traffic_Light(1, 0, 0);  //Red light on
17  delay(3000);             //Delay 3 seconds
18}
19//Define traffic light color control function
20
21void Traffic_Light(int r, int y, int g) {
22  digitalWrite(R, r);
23  digitalWrite(Y, y);
24  digitalWrite(G, g);
25}