Arduino project · Sound and music · Medium
School Bell on a Timetable (RTC)
The bell rings in the first minute of each hour, but only from 9:00 to 15:59, the school day. At night and early morning it stays quiet.
What you will learn
- How to use the hour and the minute from an RTC together
- How a later step can cancel an earlier one
- How real bell controllers work
How it works
Step 1 switches the buzzer on when the minute is 0. Steps 2 and 3 switch it off again before 9 and after 15. Move the hour and minute sliders to test it.
Try this next
- Add a different tone for lunch break.
- Skip Sundays using the day of the week.
- Use a relay and a real bell.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A bell that rings
When the program decides it is time (or something happens) the buzzer rings and the beacon flashes in the real room.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- Buzzer = the bell
- LED = the beacon