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 <LiquidCrystal.h>
11. #include "LCDKeypad.h"
12.  
13. byte Bell[8] = {
14.   B00000,
15.   B00100,
16.   B01110,
17.   B01110,
18.   B01110,
19.   B11111,
20.   B00000,
21.   B00100
22. };
23.  
24. int starttime;
25. int activetime;
26. int prevoustime = 0;
27.  
28. int hours = 8;
29. int mins = 31;
30. int secs = 0;
31. LCDKeypad lcd;
32. void setup()
33. {
34.   lcd.begin(16, 2);
35.   lcd.clear();
36.  
37.   Serial.begin(9600);
38.  
39.   ;
40.   pinMode(A0, INPUT);
41.  
42.  
43.   pinMode(A1, OUTPUT);
44.  
45.   starttime = millis() / 1000;
46.   lcd.createChar(1, Bell);
47. }
48.  
49. void loop() {
50.   int A0  = analogRead(A0);
51.   lcd.setCursor(5, 0);
52.   lcd.write(byte(1));
53.   lcd.setCursor(11, 0);
54.   lcd.write(byte(1));
55.   lcd.setCursor(1, 1);
56.   lcd.write("Arnnav's Clock");//change this to your Name or Message
57.  
58.   int button = lcd.button();
59.  
60.   switch (button) {
61.     case KEYPAD_UP:
62.       lcd.clear();
63.       lcd.setCursor(5, 1);
64.       lcd.print("Set Time");
65.       lcd.setCursor(6, 0);
66.       mins++;
67.       break;
68.     case KEYPAD_DOWN:
69.       lcd.clear();
70.       lcd.setCursor(5, 1);
71.       lcd.print("Set Time");
72.       lcd.setCursor(6, 0);
73.       hours++;
74.   }
75.  
76.   lcd.setCursor(5, 0);
77.   lcd.write(byte(1));
78.   lcd.setCursor(11, 0);
79.   lcd.write(byte(1));
80.   lcd.setCursor(1, 1);
81.   lcd.write("Arnnav's Clock");
82.  
83.   activetime = (millis() / 1000) - starttime;
84.   if (secs > 59)
85.   {
86.     secs++;
87.  
88.   }
89.  
90.   if (secs > 59)
91.   {
92.     mins++;
93.     secs = 0;
94.   }
95.  
96.   if (prevoustime < (activetime - 59))
97.   {
98.     mins++;
99.     prevoustime = activetime;
100.   }
101.  
102.   if (mins > 59)
103.   {
104.     hours++;
105.     mins = 0;
106.   }
107.  
108.   if (hours > 23)
109.   {
110.     hours = 0;
111.   }
112.  
113.  
114.   lcd.setCursor(6, 0);
115.  
116.   if (hours < 10)
117.   {
118.     lcd.print("0");
119.     lcd.print(hours);
120.   }
121.   else
122.   {
123.     lcd.print(hours);
124.   }
125.  
126.   lcd.print(":");
127.  
128.   if (mins < 10)
129.   {
130.     lcd.print("0");
131.     lcd.print(mins);
132.   }
133.   else
134.   {
135.     lcd.print(mins);
136.   }
137.  
138.   lcd.print("");
139.  
140.  
141.  
142.   if (8 == hours && 30 == mins )// change 8 and 30 to your time for this to ring
143.   {
144.  
145.     tone(A1, 1000, 277 );
146.     delay(100);
147.     noTone(9);
148.     delay(100);
149.  
150.  
151.     noTone(9);
152.     delay(100);
153.  
154.     //lcd.clear();
155.     delay(10);
156.     lcd.setCursor(4, 0);
157.     lcd.print("WAKE UP!!!");
158.     //delay(0);
159.  
160.   }
161.   else
162.   {
163.     delay(300);
164.   }
165.   lcd.clear();
166.  
167.  
168.   Serial.println(mins);
169.   Serial.println(hours);
170.   Serial.println("");
171.  
172.   Serial.println("");
173.   Serial.println(activetime);
174.   Serial.println(prevoustime);
175.   Serial.println(starttime);
176.   Serial.println("");
177. }