Automatic school bell
This project explains that how to control School Bell System using an Android Application.In School we have to especially allocate a person who has to ring the bell physically by paying special attention to time which is quite difficult for the person as well as for the management.And also it is not
2025-06-28 16:25:27 - Adil Khan
Automatic school bell
Project Area of Specialization Electrical/Electronic EngineeringProject SummaryThis project explains that how to control School Bell System using an Android Application.In School we have to especially allocate a person who has to ring the bell physically by paying special attention to time which is quite difficult for the person as well as for the management.And also it is not that accurate.This project provides the solution to this problem by integrating the bell to a control unit that can be operated by an Android Application.The bell will have a schedule for full week and there is no hard coded data.All data is provided by Android App.Moreover it will have display of current date and time as well as temperature and humidity.It will also be protected by a password.We can easily counter the problem with this project by having the accuracy and ease for the whole system.
Project ObjectivesPlays bells at preset times.
No need to assign a person for ringing bell every time.
Accuracy to timings.
No manual intervention.
Saves man power and money.
Eeasy programming with the help of manual.
Automatic School bell system replaces the Manual Switching of the Bell in the school. It has a built in Real Time Clock (DS1307) which track over the Real Time. When this time equals to the bell ringing time, then the relay for the bell is switched ON.
Benefits of the ProjectRing the bell at a pre recorded times ( 20 schedules ) This Standalone Hardware device ( Computer not required ) will ring school bell at pre-scheduled times of day( all periods ) on each day, of the week. Typically, COM time switch can used to ring school bells . It can also be used for other applications where you want a sound to play at preset times.
The Device is for Schools, Educational Institutions, Industries and other business where the Bell timer plays a critical role in running the day. The device shows the real time clock during normal operation and a beep announces each bell. Different timings for weekdays, Saturday and Sunday (all days differently ) is provided. The device can be set to ring up to 10 different bells per day with variable bell ring duration for each bell.
Technical Details of Final DeliverableIn case the peon has been late to start the school bell, the delay in minutes can be adjusted by advancing the time using switch S3. Each pushing of switch S3 advances the time by 4.5 minutes. If the school is closed early, the peon can turn the bell circuit off by momentarily pressing switch S2.The bell circuit contains timer IC NE555 (IC1), two CD4017 decade counters (IC2 and IC3) and AND gate CD4081 (IC4). Timer IC1 is wired as an astable multivibrator, whose clock output pulses are fed to IC2.
IC2 increases the time periods of IC1 (4.5 and 3 minutes) by ten times to provide a clock pulse to IC3 every 45 minutes or after 30 minutes, respectively. When the class periods are going on, the outputs of IC3 switch on transistors T1 and T2 via diodes D4 through D12.
Resistors R4 and R5 connected in series to the emitter of npn transistor T2 decide the 4.5-minute time period of IC1. The output of IC1 is further connected to pin 14 of IC2 to provide a period with a duration of 45 minutes. Similarly, resistors R2 and R3 connected in series to the emitter of npn transistor T1 decide the 3-minute time period of IC1, which is further given to IC2 to provide the lunch-break duration of 30 minutes.
Initially, the circuit does not ground to perform its operation when 12V power supply is given to the circuit. When switch S1 is pressed momentarily, a high enough voltage to fire silicon-controlled resistor SCR1 appears at its gate. When SCR1 is fired, it provides ground path to operate the circuit after resetting both decade counters IC2 and IC3. At the same time, LED1 glows to indicate that school bell is now active.
Final Deliverable of the Project HW/SW integrated systemCore Industry OthersOther Industries Education Core Technology OthersOther TechnologiesSustainable Development Goals Quality EducationRequired Resources| Item Name | Type | No. of Units | Per Unit Cost (in Rs) | Total (in Rs) |
|---|---|---|---|---|
| Total in (Rs) | 5000 | |||
| Aurdino | Equipment | 1 | 1200 | 1200 |
| RTC module | Equipment | 1 | 500 | 500 |
| Relay module | Equipment | 1 | 700 | 700 |
| LCD | Equipment | 1 | 1200 | 1200 |
| Buzzer | Equipment | 1 | 400 | 400 |
| Vero board | Equipment | 1 | 100 | 100 |
| Power supply | Equipment | 1 | 300 | 300 |
| Blutooth module | Equipment | 1 | 500 | 500 |
| Jumper wires | Miscellaneous | 1 | 100 | 100 |