This project aims to develop a Computer-Based Controlled Electronic Bell for Lyceum of the Philippines-Laguna. The researcher used a developmental research method using interfacing circuit, computer and computer program. To determine the accuracy and reliability of the system, a series of tests was conducted. A circuit that interfaced the computer and the manually operated switch of the existing electronic bell and a developed computer program that controls the time of one long bell and two short bells was developed. Instructions on how to operate the project were given to the staff of the Human Resource Management Development Office and further tested for operational accuracy and reliability of the system. The system is currently applied at Lyceum of the Philippines –Laguna.