Traffic Light

1#include <LiquidCrystal.h>
2const int rs = 12, en = 11, d4 = 5, d5 =  4, d6 = 3, d7 = 2;
3int vreme,boja,normal,yel,start,kraj;
4LiquidCrystal lcd(rs,  en, d4, d5, d6, d7);
5
6
7
8
9void setup() {
10  // put your setup code  here, to run once:
11  lcd.begin(16, 3);
12
13pinMode (8,OUTPUT);  // crvena  LED
14pinMode (6,OUTPUT);  // zuta LED
15pinMode (7,OUTPUT);  // zelena LED
16
17pinMode  (9,INPUT_PULLUP);  // start,normal = 1
18pinMode (10,INPUT_PULLUP); // kraj,normal  = 0
19
20vreme  = 55;
21boja   = 1;  // 1 - crveno, 2 - zuto, 3 - zeleno
22normal  = 1 ; // 1 - semafor radi normalno, 0 - zuto trepcuce
23}
24
25
26void loop()  {
27
28  start = digitalRead (9);
29  kraj  = digitalRead (10);
30
31  if (start  == 0) {
32    normal = 1;
33  }
34  if (kraj == 0) {
35    normal = 0;
36    lcd.clear();
37    lcd.print ("Semafor ne radi!");
38    lcd.setCursor (0, 1);
39    lcd.print  ("Vozi pazljivo!");
40    vreme = 55;
41    boja = 1;
42    digitalWrite (6,  LOW);
43    digitalWrite (7, LOW);
44    digitalWrite (8, LOW);
45  }
46
47  if (normal == 1) {
48     if (boja == 1)
49       {digitalWrite (8,HIGH);
50       digitalWrite (6,LOW);
51       digitalWrite (7,LOW);}
52     if (boja ==  2)
53       { digitalWrite (8,LOW);
54       digitalWrite (6,HIGH);
55       digitalWrite  (7,LOW);}
56    if (boja == 3)
57      { digitalWrite (8,LOW);
58      digitalWrite  (6,LOW);
59      digitalWrite (7,HIGH);}
60    lcd.clear();
61    lcd.print (vreme);
62    delay (998);
63    vreme = vreme - 1;
64
65    if (vreme == 0) {
66      if  (boja == 3) {
67        boja = 0;
68      }
69      boja = boja + 1;
70
71      if (boja == 2) {
72        vreme = 11;
73      }
74      else {
75        vreme  = 55;
76      }
77    
78    }
79  }
80  else {
81    digitalWrite (6, HIGH);
82    delay (500);
83    digitalWrite (6, LOW);
84    delay (500);
85  }
86
87}
88