Ricky G. Jaleco (March 2010)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
To ring company bells at the right time is a task and investment of time, effort, and money. The existence of an automated bell system would eliminate the need of human attention in the ringing of the bell. This study aims to develop a computer-controlled school bell system using a decoder circuit and programmed using Visual Basic and C Language software. The objectives include (1) to create a decoder and (2) to develop a Visual Basic program that would control the switching of the school bell.
A device composed of the decoder, bell driver and power supply circuits was constructed to enable communication between the computer and school bell. The decoder circuit decodes binary coded inputs; the bell driver circuit controls the ringing of the bell; and the power supply circuit provides power to the device. A Visual Basi program was made to provide an interface for the user to control the ringing of the bell with a display of a clock and the recorded schedules.
The program is able to record and ring the bell at 12 different schedules and also to ring it manually; its input is sent to decoder circuit through a parallel port. The decoded binary code is then sent to the bell driver circuit for ringing.
Recommendations of the study include(1) to add a more preset time or period and (2) to enhance the system (monitor and control the bell system devices over the internet).