• The goal and purpose of this project is to build and design a simple Digital Clock with Alarm and LED Matrix Display, to displays the current time on LED display and it also can be set to sound an Alarm on a specific time. The clock uses an LED matrix to display the time, and a buzzer to sound the alarm.

• The idea of this project comes from an actual Digital clock but I added the Alarm function.

The following components are required for this project:

• Tiny RTC module with I2C interface

• LED matrix (8×8 or higher)

• 3 Push buttons

• Buzzer for alarm sound

• Arduino Uno

• Breadboard

* 3 Resistors

• Wires

The following software requirements are necessary for this project:

• RTC library (e.g., DS1307)

• GPIO library for controlling LED matrix

• Timer function to update the time and trigger the alarm

• Button input and buzzer output code

#include <Wire.h>

#include <RTClib.h>

#include <LedControl.h>

const int buttonPin = 2;

const int buzzerPin = 9;

const int dinPin = 12; Data input pin const int clkPin = 11; const int csPin = 10; LedControl ledMatrix = LedControl(dinPin, clkPin, csPin, 0); Use type 0 for MAX7219

const int rtcSdaPin = A4; RTC SDA pin const int rtcSclPin = A5; RTC SCL pin

RTC_DS1307 rtc;

int alarmHourSet = 0;

int alarmMinuteSet = 0;

byte digitPatterns[10][8] = {

{B0111110, B1000001, B1000001, B1000001, B1000001, B1000001, B1000001, B0111110},  // Digit 0

{B0000000, B0000001, B0000001, B0000000, B0000000, B0000000, B0000001, B0000001},  // Digit 1

{B0111011, B1000100, B0000100, B0000100, B0000100, B0000100, B1000100, B1111111},  // Digit 2

{B0111110, B0000001, B0000001, B0111110, B1000000, B1000000, B1000000, B0111110},  // Digit 3

{B1000001, B1000001, B1000001, B1111111, B0000001, B0000001, B0000001, B0000001},  // Digit 4

{B1111111, B1000000, B1000000, B1111110, B0000001, B0000001, B1000001, B0111110},  // Digit 5

{B0011110, B0100001, B1000000, B1111110, B1000001, B1000001, B1000001, B0111110},  // Digit 6

{B1111111, B0000001, B0000001, B0000001, B0000001, B0000001, B0000001, B0000001},  // Digit 7

{B0111110, B1000001, B1000001, B0111110, B1000001, B1000001, B1000001, B0111110},  // Digit 8

{B0111110, B1000001, B1000001, B1000001, B1000001, B0111110, B0000001, B0000001}   // Digit 9

};

void setup() {

Serial.begin(9600);
Wire.begin();

pinMode(rtcSdaPin, INPUT_PULLUP);
pinMode(rtcSclPin, INPUT_PULLUP);
rtc.begin();

pinMode(buttonPin, INPUT_PULLUP);
pinMode(buzzerPin, OUTPUT);

ledMatrix.shutdown(0, false);   // Wake up the MAX7219 module
ledMatrix.setIntensity(0, 1);   // Set the LED matrix brightness (0-15)
ledMatrix.clearDisplay(0);      // Clear the display

// Set the initial alarm time
setAlarmTime();

}

void loop() {

checkButton();
displayTime();

}

void setAlarmTime() {

Serial.println("Enter alarm time (hh:mm):");
while (!Serial.available()) {
  // Wait for input from the serial monitor
}
delay(100);

String input = Serial.readString();
int separatorIndex = input.indexOf(':');

if (separatorIndex > 0) {
  String hourString = input.substring(0, separatorIndex);
  String minuteString = input.substring(separatorIndex + 1);

  alarmHourSet = hourString.toInt();
  alarmMinuteSet = minuteString.toInt();

  Serial.print("Alarm time set: ");
  Serial.println(input);
} else {
  Serial.println("Invalid input format. Please try again.");
  setAlarmTime();
}

}

void checkButton() {

static bool buttonPressed = false;

if (digitalRead(buttonPin) == LOW && !buttonPressed) {
  // Button is pressed for the first time, activate the buzzer
  toggleAlarm();
  buttonPressed = true;
} else if (digitalRead(buttonPin) == HIGH && buttonPressed) {
  // Button is released, reset the button pressed flag
  buttonPressed = false;
}

}

void toggleAlarm() {

static bool alarmOn = false;
alarmOn = !alarmOn;

if (alarmOn) {
  digitalWrite(buzzerPin, HIGH);
} else {
  digitalWrite(buzzerPin, LOW);
}

}

void displayTime() {

DateTime now = rtc.now();
int currentHour = now.hour();
int currentMinute = now.minute();

int hourTens = currentHour / 10;
int hourOnes = currentHour % 10;
int minuteTens = currentMinute / 10;
int minuteOnes = currentMinute % 10;

// Display the hour tens digit
for (int i = 0; i < 8; i++) {
  byte pattern = digitPatterns[hourTens][i];
  ledMatrix.setRow(0, i, pattern);
}

// Display the hour ones digit
for (int i = 0; i < 8; i++) {
  byte pattern = digitPatterns[hourOnes][i];
  ledMatrix.setRow(0, i + 8, pattern);
}

// Display the minute tens digit
for (int i = 0; i < 8; i++) {
  byte pattern = digitPatterns[minuteTens][i];
  ledMatrix.setRow(0, i + 16, pattern);
}

// Display the minute ones digit
for (int i = 0; i < 8; i++) {
  byte pattern = digitPatterns[minuteOnes][i];
  ledMatrix.setRow(0, i + 24, pattern);
}

}

What were the results obtained after the realization of your project.

An archive (or more if necessary) with the files obtained as a result of the project: sources, schemes, etc. A README file, a ChangeLog, a build script and automatic copy on uC always make a good impression .

The files are uploaded to the wiki using the Add Images or other files feature. The namespace in which the files are uploaded is of the type :pm:prj20??:c? or :pm:prj20??:c?:student_name (if applicable). Example: Dumitru Alin, 331CC → :pm:prj2009:cc:dumitru_alin.

You can also have a journal section where the project assistant can track the progress of the project.

List of documents, datasheets, Internet resources used, possibly grouped by Software Resources and Hardware Resources.