Programmable Arduino Timer

1#include <Keypad.h>
2#include <LedControl.h>
3#include <SPI.h>
4
5const byte ROWS = 4; 
6const byte COLS = 4; 
7char keys[ROWS][COLS] = {
8  {'1', '2', '3', 'A'},
9  {'4', '5', '6', 'B'},
10  {'7', '8', '9', 'C'},
11  {'*', '0', '#', 'D'}
12};
13byte rowPins[ROWS] = {5, 4, 3, 2}; 
14byte colPins[COLS] = {9, 8, 7, 6}; 
15
16Keypad keypadObj = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
17LedControl lc = LedControl(12, 11, 10, 1);
18
19long csecondsLeft;
20int decrement = 3;
21bool explosed = false;
22
23long hours = 0;
24long minutes = 0;
25long seconds = 0;
26long hundredths = 0;
27
28char keypadOutput[32] = {0};
29byte playSound = 18;
30
31void setup() {
32  csecondsLeft = 0;
33  Serial.begin(9600);
34  lc.shutdown(0, false);
35  lc.setIntensity(0, 8);
36  lc.clearDisplay(0);
37  pinMode(13, OUTPUT);
38  pinMode(18, OUTPUT);
39  analogWrite(18, 0);
40}
41
42bool isProgrammingTime = false;
43String inputKeys = ""; 
44String programmedTime = ""; 
45bool isCountingDown = false; 
46
47void updateDisplay() {
48
49  long remainingSeconds = csecondsLeft / 100;
50
51  hours = remainingSeconds / 3600;
52  remainingSeconds %= 3600;
53  minutes = remainingSeconds / 60;
54  seconds = remainingSeconds % 60;
55  hundredths = csecondsLeft % 100;
56
57  lc.setDigit(0, 7, hours / 10, false);
58  lc.setDigit(0, 6, hours % 10, false);
59  lc.setDigit(0, 5, minutes / 10, false); 
60  lc.setDigit(0, 4, minutes % 10, false);
61  lc.setDigit(0, 3, seconds / 10, false);
62  lc.setDigit(0, 2, seconds % 10, false);
63  lc.setDigit(0, 1, hundredths / 10, false);
64  lc.setDigit(0, 0, hundredths % 10, false);
65}
66
67void programTime() {
68
69  if (inputKeys.length() >= 8) {
70
71    inputKeys = inputKeys.substring(0, 8);
72
73    programmedTime = inputKeys.substring(0, 2) + ":" + inputKeys.substring(2, 4) + ":" + inputKeys.substring(4, 6) + ":" + inputKeys.substring(6, 8);
74
75    Serial.print("inputKeys: "); Serial.println(inputKeys);
76    Serial.print("programmedTime: "); Serial.println(programmedTime);
77
78    lc.clearDisplay(0);
79
80    inputKeys = "";
81  }
82}
83
84void startCountdown() {
85
86  Serial.println("Starting countdown...");
87
88  if (programmedTime.length() == 11) { 
89    hours = programmedTime.substring(0, 2).toInt();
90    minutes = programmedTime.substring(3, 5).toInt();
91    seconds = programmedTime.substring(6, 8).toInt();
92    hundredths = programmedTime.substring(9, 11).toInt();
93
94    csecondsLeft = ((hours * 3600) + (minutes * 60) + seconds) * 100 + hundredths;
95  } else {
96    Serial.println("Invalid programmed time. Please enter a time greater than zero.");
97    return;
98  }
99 
100  updateDisplay();
101  isCountingDown = true; 
102}
103
104
105void loop() {
106  char key = keypadObj.getKey();
107
108  if (key) {
109    Serial.print("Key Pressed: ");
110    Serial.println(key);
111
112    if (key >= '0' && key <= '9') {
113      int num = key - '0';
114      int displayIndex = 7 - inputKeys.length();
115      lc.setDigit(0, displayIndex, num, false);
116      inputKeys += key;
117      tone(playSound, 1000, 50);
118    }
119
120    if (!isProgrammingTime && key == 'A') { 
121
122      Serial.println("Programming time...");
123      isProgrammingTime = true;
124      inputKeys = ""; 
125      programmedTime = ""; 
126      lc.clearDisplay(0); 
127
128    } else if (isProgrammingTime && key == 'D') { 
129
130  isProgrammingTime = false;
131  programTime();
132  Serial.print("Programmed Time: ");
133  Serial.println(programmedTime);
134  startCountdown();
135  programmedTime = ""; 
136}
137  }
138
139  else if (isCountingDown) {
140
141      delay(30); 
142      csecondsLeft -= decrement;
143
144      if (csecondsLeft < 0) {
145        csecondsLeft = 0;
146        if (!explosed) {
147          tone(playSound, 1000, 50);
148          digitalWrite(13, HIGH);
149        }
150        explosed = true;
151      }
152      updateDisplay(); 
153      if (csecondsLeft % 35 == 0) {
154        tone(playSound, 3236, 50);
155      }
156    
157  }
158}