Arduino HPDL1414 Retro Clock with Set and Alarm Functions

1#include <HPDL1414.h>
2#include <RTClib.h>
3#include <Wire.h>
4
5const byte dataPins[7] = {2, 3, 4, 5, 6, 7, 8};  // Segment data pins: D0 - D6
6const byte addrPins[2] = {A1, A2};               // Segment address pins: A0, A1
7const byte wrenPins[] = {A0, A3};                // Write Enable pins (left to right)
8
9RTC_DS3231 rtc;
10char msg[] = "         *** MICRO CLOCK - MIRCEMK ***        ";
11char t[32];
12HPDL1414 hpdl(dataPins, addrPins, wrenPins, sizeof(wrenPins));
13
14// Button pins
15const int buttonHourPin = 9;
16const int buttonMinutePin = 10;
17const int buttonSetPin = 11;
18
19// Buzzer pin
20const int buzzerPin = 12;  // Add a pin for the buzzer
21
22// Variables for setting time and alarm manually
23int hours = 0;
24int minutes = 0;
25int alarmHours = 0;
26int alarmMinutes = 0;
27bool setMode = false;      // Time setting mode flag
28bool alarmMode = false;    // Alarm setting mode flag
29bool alarmEnabled = false; // Alarm enabled flag
30bool alarmActive = false;  // Alarm active (sounding) flag
31bool alarmAcknowledged = false; // Alarm acknowledged (stopped) flag
32
33// Buzzer timing
34unsigned long previousMillis = 0;
35const long beepInterval = 500;  // 500ms on, 500ms off
36bool buzzerState = false;       // To track buzzer state (on/off)
37
38void setup() {
39  Serial.begin(9600);
40  Wire.begin();
41  hpdl.begin();
42  hpdl.clear();
43
44  // Set up buttons and buzzer
45  pinMode(buttonHourPin, INPUT_PULLUP);
46  pinMode(buttonMinutePin, INPUT_PULLUP);
47  pinMode(buttonSetPin, INPUT_PULLUP);
48  pinMode(buzzerPin, OUTPUT);
49  digitalWrite(buzzerPin, LOW);  // Make sure the buzzer is off initially
50
51  // Display scrolling message at startup
52  for (byte i = 0; i < (sizeof(msg) / sizeof(char)); i++) {
53    for (byte j = 0; j < 16; j++) {
54      hpdl.setCursor(j);
55      if (i + j < (sizeof(msg) / sizeof(char))) {
56        hpdl.print(msg[i + j]);
57      } else {
58        hpdl.print(" ");
59      }
60    }
61    delay(200);
62  }
63
64  rtc.begin();
65  // Initialize time variables from the RTC
66  DateTime now = rtc.now();
67  hours = now.hour();
68  minutes = now.minute();
69}
70
71void loop() {
72  // Get the current time from the RTC
73  DateTime now = rtc.now();
74
75  // Check if the alarm is active (buzzer sounding)
76  if (alarmActive) {
77    unsigned long currentMillis = millis();
78    
79    // Toggle the buzzer every 500ms (buzzerState controls on/off)
80    if (currentMillis - previousMillis >= beepInterval) {
81      previousMillis = currentMillis;  // Save the last time the buzzer toggled
82      buzzerState = !buzzerState;      // Toggle the buzzer state
83      digitalWrite(buzzerPin, buzzerState ? HIGH : LOW);  // Turn the buzzer on or off
84    }
85
86    // Check if D11 is pressed to stop the alarm
87    if (digitalRead(buttonSetPin) == LOW) {
88      alarmActive = false;  // Stop the alarm
89      alarmAcknowledged = true;  // Mark the alarm as acknowledged
90      digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
91      delay(500);  // Debounce delay
92      return;  // Return to normal loop operation
93    }
94  }
95
96  // Check if we are in time or alarm setting mode
97  if (setMode) {
98    // Display the manually set time
99    sprintf(t, "%02d-%02d", hours, minutes);
100    hpdl.clear();
101    hpdl.print(t);
102
103    // Check if buttons to adjust hours or minutes are pressed
104    if (digitalRead(buttonHourPin) == LOW) {
105      hours = (hours + 1) % 24;  // Increment hours and roll over after 23
106      delay(200);  // Debouncing
107    }
108    if (digitalRead(buttonMinutePin) == LOW) {
109      minutes = (minutes + 1) % 60;  // Increment minutes and roll over after 59
110      delay(200);  // Debouncing
111    }
112  } else if (alarmMode) {
113    // Display the manually set alarm time
114    sprintf(t, "A%02d-%02d", alarmHours, alarmMinutes);
115    hpdl.clear();
116    hpdl.print(t);
117
118    // Check if buttons to adjust alarm hours or minutes are pressed
119    if (digitalRead(buttonHourPin) == LOW) {
120      alarmHours = (alarmHours + 1) % 24;  // Increment alarm hours and roll over after 23
121      delay(200);  // Debouncing
122    }
123    if (digitalRead(buttonMinutePin) == LOW) {
124      alarmMinutes = (alarmMinutes + 1) % 60;  // Increment alarm minutes and roll over after 59
125      delay(200);  // Debouncing
126    }
127  } else {
128    // Normal operation: Display the current time from the RTC
129    sprintf(t, "%02d-%02d-%02d", now.hour(), now.minute(), now.second());
130    hpdl.clear();
131    hpdl.print(t);
132
133    // Check if the current time matches the alarm time and alarm is not acknowledged
134    if (alarmEnabled && !alarmAcknowledged && now.hour() == alarmHours && now.minute() == alarmMinutes && now.second() == 0) {
135      alarmActive = true;  // Mark the alarm as active
136      previousMillis = millis();  // Initialize the timer for buzzer beeping
137    }
138
139    // Reset the alarm acknowledgement flag if the minute has changed
140    if (now.minute() != alarmMinutes) {
141      alarmAcknowledged = false;  // Allow the alarm to trigger again when the time matches next
142    }
143  }
144
145  // Check if the Set button (buttonSetPin) is pressed to toggle between modes
146  if (digitalRead(buttonSetPin) == LOW && !alarmActive) {
147    if (setMode) {
148      // Exiting time set mode, update the RTC with the manually set time
149      rtc.adjust(DateTime(2024, 1, 1, hours, minutes, 0));  // Arbitrary date
150      setMode = false;
151      alarmMode = true;  // Move to alarm setting mode
152    } else if (alarmMode) {
153      // Exiting alarm set mode, enable the alarm
154      alarmEnabled = true;
155      alarmMode = false; // Back to normal mode
156    } else {
157      // Enter time setting mode
158      setMode = true;
159    }
160    delay(500);  // Debouncing delay
161  }
162}