1. /*
2.    This Code is built for Arduino Keypad shield,
3.    arduino UNO or MEGA(remember to change board)
4.    Tools -> board -> UNO or MEGA -> port -> <your port no. your using>COM
5.    Default time for alarm is 8:30AM(change line 139 to the time of ringing and 35 and 36 1 min after your time )
6.    press RST button on keypad if you want ringing to stop
7.    UP = Minutes + 1
8.    DOWN = hours + 1
9. */
10. #include <EEPROM.h>
11. #include <LiquidCrystal.h>
12. #include "LCDKeypad.h"
13. int addr = 0;
14. int addrs = 1;
15. byte Bell[8] = {
16.   B00000,
17.   B00100,
18.   B01110,
19.   B01110,
20.   B01110,
21.   B11111,
22.   B00000,
23.   B00100
24. };
25.  
26. int starttime;
27. int activetime;
28. int prevoustime = 0;
29.  
30. int hours ;
31. int mins ;
32. int secs = 0;
33. LCDKeypad lcd;
34. void setup()
35. {
36.  
37.   hours = EEPROM.put(addr,hours);
38.   mins = EEPROM.put(addrs,mins);
39.   lcd.begin(16, 2);
40.   lcd.clear();
41.  
42.   Serial.begin(9600);
43.  
44.   ;
45.   pinMode(A0, INPUT);
46.  
47.  
48.   pinMode(A1, OUTPUT);
49.  
50.   starttime = millis() / 1000;
51.   lcd.createChar(1, Bell);
52. }
53.  
54. void loop() {
55.  int hours = EEPROM.put(addr,hours);
56.   int mins = EEPROM.put(addrs,mins);
57.   int A0  = analogRead(A0);
58.   lcd.setCursor(5, 0);
59.   lcd.write(byte(1));
60.   lcd.setCursor(11, 0);
61.   lcd.write(byte(1));
62.   lcd.setCursor(1, 1);
63.   lcd.write("Arnnav's Clock");//change this to your Name or Message
64.  
65.   int button = lcd.button();
66.  
67.   switch (button) {
68.     case KEYPAD_UP:
69.       lcd.clear();
70.       lcd.setCursor(5, 1);
71.       lcd.print("Set Time");
72.       lcd.setCursor(6, 0);
73.       mins++;
74.       break;
75.     case KEYPAD_DOWN:
76.       lcd.clear();
77.       lcd.setCursor(5, 1);
78.       lcd.print("Set Time");
79.       lcd.setCursor(6, 0);
80.       hours++;
81.   }
82.  
83.   lcd.setCursor(5, 0);
84.   lcd.write(byte(1));
85.   lcd.setCursor(11, 0);
86.   lcd.write(byte(1));
87.   lcd.setCursor(1, 1);
88.   lcd.write("Arnnav's Clock");
89.  
90.   activetime = (millis() / 1000) - starttime;
91.   if (secs > 59)
92.   {
93.     secs++;
94.  
95.   }
96.  
97.   if (secs > 59)
98.   {
99.     mins++;
100.     secs = 0;
101.   }
102.  
103.   if (prevoustime < (activetime - 59))
104.   {
105.     mins++;
106.     prevoustime = activetime;
107.   }
108.  
109.   if (mins > 59)
110.   {
111.     hours++;
112.     mins = 0;
113.   }
114.  
115.   if (hours > 23)
116.   {
117.     hours = 0;
118.   }
119.  
120.  
121.   lcd.setCursor(6, 0);
122.  
123.   if (hours < 10)
124.   {
125.     lcd.print("0");
126.     lcd.print(hours);
127.   }
128.   else
129.   {
130.     lcd.print(hours);
131.   }
132.  
133.   lcd.print(":");
134.  
135.   if (mins < 10)
136.   {
137.     lcd.print("0");
138.     lcd.print(mins);
139.   }
140.   else
141.   {
142.     lcd.print(mins);
143.   }
144.  
145.   lcd.print("");
146.  
147.  
148.  
149.   if (8 == hours && 30 == mins )// change 8 and 30 to your time for this to ring
150.   {
151.  
152.     tone(A1, 1000, 277 );
153.     delay(100);
154.     noTone(9);
155.     delay(100);
156.  
157.  
158.     noTone(9);
159.     delay(100);
160.  
161.     //lcd.clear();
162.     delay(10);
163.     lcd.setCursor(4, 0);
164.     lcd.print("WAKE UP!!!");
165.     //delay(0);
166.  
167.   }
168.   else
169.   {
170.     delay(300);
171.   }
172.   lcd.clear();
173.  
174.  
175.   Serial.println(mins);
176.   Serial.println(hours);
177.   Serial.println("");
178.  
179.   Serial.println(activetime);
180.   Serial.println(prevoustime);
181.   Serial.println(starttime);
182.   Serial.println("");
183.    EEPROM.put(addr,hours);
184.    EEPROM.put(addrs,mins);
185. }