Check out the build video: https://youtu.be/jQZd02m6ArI
Since our school began, we have always been relying on the security guard to press a trigger to ring the school bell during class start, subject transition, recess, and school end. But only recently that the member of the board realized that these guards are often unable to ring the bell during rush hour. So, having known in the past that I have helped fixed some school properties, one of the board members asked me if I could make an automated system. So, I began my research, collecting materials, and started the build.
How it Works
The system is made up of three main components, a micro-controller, a relay, and a real-time clock module. The heart of the system is the Arduino micro-controller, it runs the code which contains the school bell schedule and checks the compares it with the time of the day provided by the real-time clock module. The real-time clock module has its own battery so that just in case a black out happens, the system clock does not need to be reset, it will continue to tick without being interrupted. When the time of the day matches the one in the schedule, the micro-controller will send a signal to the relay to close the circuit and thus make the bell ring.
video by: Samuel Lau
Automated School Bell
Uploaded on YouTube by Thadeo Arlo