Digital Clock

1#include <LiquidCrystal.h>
2//to change time, hold chanage time button  for 1 second, then use hour chnage and minute change buttons.
3
4LiquidCrystal  lcd(12, 11, 5, 4, 3, 2);
5int hour = 12;
6int minutes = 0;
7int seconds =  0;
8int decBtn = 10;
9int hrUp = 9;
10int hrDwn = 8;
11int minUp = 7;
12int  minDwn = 6;
13int hrUpDec = 0;
14int hrDwnDec = 0;
15int minUpDec = 0;
16int  minDwnDec = 0;
17
18void setup() {
19  lcd.begin(16, 2);
20  pinMode(decBtn,  INPUT);
21  pinMode(hrUp, INPUT);
22  pinMode(hrDwn, INPUT);
23  pinMode(minUp,  INPUT);
24  pinMode(minDwn, INPUT);
25}
26
27void loop() {
28  if (digitalRead(decBtn)  == HIGH) {
29    if (digitalRead(hrUp) == HIGH && hrUpDec == 0) {
30      hrUpDec  = 1;
31      hour = hour + 1;
32    } else if (digitalRead(hrUp) == LOW) {
33      hrUpDec = 0;
34    }
35    if (digitalRead(hrDwn) == HIGH && hrDwnDec ==  0) {
36      hrDwnDec = 1;
37      hour = hour - 1;
38    } else if (digitalRead(hrDwn)  == LOW) {
39      hrDwnDec = 0;
40    }
41    if (digitalRead(minUp) == HIGH  && minUpDec == 0) {
42      minUpDec = 1;
43      minutes = minutes + 1;
44    }  else if (digitalRead(minUp) == LOW) {
45      minUpDec = 0;
46    }
47    if  (digitalRead(minDwn) == HIGH && minDwnDec == 0) {
48      minDwnDec = 1;
49      minutes  = minutes - 1;
50    } else if (digitalRead(minDwn) == LOW) {
51      minDwnDec  = 0;
52    }
53    seconds = 0;
54    lcd.clear();
55    if (minutes == 60)  {
56      minutes = 0;
57      hour = hour + 1;
58    }
59    if (minutes <  0) {
60      minutes = 59;
61    }
62    if (hour == 13) {
63      hour = 1;
64    }
65    if (hour < 1) {
66      hour = 12;
67    }
68    lcd.print(hour);
69    lcd.print(":");
70    if (minutes < 10) {
71      lcd.print(0);
72    }
73    lcd.print(minutes);
74    delay(20);
75  } else if (digitalRead(decBtn) ==  LOW) {
76    lcd.clear();
77    if (seconds == 60) {
78      seconds = 0;
79      minutes = minutes + 1;
80    }
81    if (minutes == 60) {
82      minutes  = 0;
83      hour = hour + 1;
84    }
85    if (minutes < 0) {
86      minutes  = 59;
87    }
88    if (hour == 13) {
89      hour = 1;
90    }
91    if (hour  < 1) {
92      hour = 12;
93    }
94    lcd.print(hour);
95    lcd.print(":");
96    if (minutes < 10) {
97      lcd.print(0);
98    }
99    lcd.print(minutes);
100    delay(1000);
101    lcd.clear();
102    seconds = seconds + 1;
103  }
104}