Automatic School Bell system

OBJECTIVE

The project aims to build an Automatic School Bell System using Arduino Uno, I2C LCD, and a buzzer to ring bells automatically as per a set timetable, ensuring timely periods and breaks without manual effort.

MODULES REQUIRED

Arduino uno
RTC DS1307
Buzzer
LCD 16 X 2 I2C

SCHEMATIC DIAGRAM

SCHEMATIC CONNECTION

Connect LCD :

Connect the VCC pin of the LCD to the 5V pin on the Arduino .

Connect the GND pin of the LCD to the GND pin on the Arduino

Connect the SDA pin of the LCD to pin A4 on the Arduino.

Connect the SCL pin of the LCD to pin A5 on the Arduino.

Connect RTC :

Connect the VCC pin of the RTC to the 5V on the Arduino .

Connect the -ve pin of the RTC to the GND on the Arduino .

Connect the SDA pin of the RTC to the A4 on the Arduino .

Connect the SCL pin of the RTC to the A5 on the Arduino .

Connect buzzer :

Connect the +ve pin of the buzzer to the D8 on the Arduino .

Connect the -ve pin of the buzzer to the GND on the Arduino .

To begin your project, click this template link:

Simulate on Wokwi

ARDUINO CODE


#include (Wire.h)
#include (LiquidCrystal_I2C.h)

LiquidCrystal_I2C lcd(0x27, 16, 2);
const int buzzerPin = 8;

int hour = 8;
int minute = 29;
int second = 50;

void setup() {
  Wire.begin();
  lcd.begin(16, 2);
  lcd.backlight();
  pinMode(buzzerPin, OUTPUT);

  lcd.setCursor(0, 0);
  lcd.print("School Bell Sys");
  delay(2000);
  lcd.clear();
}

void loop() {
  delay(1000);
  second++;
  if (second >= 60) {
    second = 0;
    minute++;
  }
  if (minute >= 60) {
    minute = 0;
    hour++;
  }
  if (hour >= 24) {
    hour = 0;
  }

  displayTime();

  if (second == 0 && (
    (hour == 8 && minute == 30) || // Start
    (hour == 9 && minute == 10) || // Period 1 Ends
    (hour == 9 && minute == 50) || // Period 2 Ends
    (hour == 10 && minute == 30) || // Period 3 Ends
    (hour == 10 && minute == 50) || // Break Start
    (hour == 11 && minute == 0) ||  // Break Over
    (hour == 11 && minute == 40) || // Period 4 Ends
    (hour == 12 && minute == 20) || // Period 5 Ends
    (hour == 13 && minute == 0)  || // Lunch Start
    (hour == 13 && minute == 40) || // Lunch Over
    (hour == 14 && minute == 20) || // Period 6 Ends
    (hour == 15 && minute == 0)  || // Period 7 Ends
    (hour == 15 && minute == 40) || // Period 8 Ends
    (hour == 16 && minute == 0)     // School Ends
  )) {
    Ring Bell();
  }
}

void displayTime() {
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  if (hour < 10) lcd.print('0');
  lcd.print(hour);
  lcd.print(':');
  if (minute < 10) lcd.print('0');
  lcd.print(minute);
  lcd.print(':');
  if (second < 10) lcd.print('0');
  lcd.print(second);
  lcd.print("  ");
}

void ringBell() {
  lcd.setCursor(0, 1);
  lcd.print("Bell Ringing...  ");
  for (int i = 0; i < 3; i++) {
    tone(buzzerPin, 1000);
    delay(500);
    noTone(buzzerPin);
    delay(500);
  }
  lcd.setCursor(0, 1);
  lcd.print("                "); // Clear
}

INSTRUCTIONS

Assemble the circuit by connecting all components as shown in the schematic diagram.

On the left side of the screen, open sketch.ino and write your Arduino code.

After completing the circuit and writing the code, click the green Play button to start the simulation.

The system automatically rings the school bell on a preset schedule using an LCD and buzzer for timely class transitions.

WORKING PRINCIPLE

The system simulates a real-time clock using Arduino to track time and triggers a buzzer to ring the bell at predefined intervals for periods, breaks, and school closing.

Project Link

for your reference.