LED traffic control

1// variables
2int GREEN = 2;
3int YELLOW = 3;
4int RED = 4;
5int  DELAY_GREEN = 5000;
6int DELAY_YELLOW = 2000;
7int DELAY_RED = 5000;
8
9
10//  basic functions
11void setup()
12{
13  pinMode(GREEN, OUTPUT);
14  pinMode(YELLOW,  OUTPUT);
15  pinMode(RED, OUTPUT);
16}
17
18void loop()
19{
20  green_light();
21  delay(DELAY_GREEN);
22  yellow_light();
23  delay(DELAY_YELLOW);
24  red_light();
25  delay(DELAY_RED);
26}
27
28void green_light()
29{
30  digitalWrite(GREEN,  HIGH);
31  digitalWrite(YELLOW, LOW);
32  digitalWrite(RED, LOW);
33}
34
35void  yellow_light()
36{
37  digitalWrite(GREEN, LOW);
38  digitalWrite(YELLOW, HIGH);
39  digitalWrite(RED, LOW);
40}
41
42void red_light()
43{
44  digitalWrite(GREEN,  LOW);
45  digitalWrite(YELLOW, LOW);
46  digitalWrite(RED, HIGH);
47}
48

1// variables
2int GREEN = 2;
3int YELLOW = 3;
4int RED = 4;
5int
6  DELAY_GREEN = 5000;
7int DELAY_YELLOW = 2000;
8int DELAY_RED = 5000;
9
10
11//
12  basic functions
13void setup()
14{
15  pinMode(GREEN, OUTPUT);
16  pinMode(YELLOW,
17  OUTPUT);
18  pinMode(RED, OUTPUT);
19}
20
21void loop()
22{
23  green_light();
24
25  delay(DELAY_GREEN);
26  yellow_light();
27  delay(DELAY_YELLOW);
28  red_light();
29
30  delay(DELAY_RED);
31}
32
33void green_light()
34{
35  digitalWrite(GREEN,
36  HIGH);
37  digitalWrite(YELLOW, LOW);
38  digitalWrite(RED, LOW);
39}
40
41void
42  yellow_light()
43{
44  digitalWrite(GREEN, LOW);
45  digitalWrite(YELLOW, HIGH);
46
47  digitalWrite(RED, LOW);
48}
49
50void red_light()
51{
52  digitalWrite(GREEN,
53  LOW);
54  digitalWrite(YELLOW, LOW);
55  digitalWrite(RED, HIGH);
56}
57