The On-Board computer (OBC) in CubeSat is the subsystem which acts as a bridge that connects the other subsystems with each other. It supervises many of the tasks that are done by the different subsystems of satellite and performs housekeeping and monitoring to ensure the health and status of those subsystems. The hardware and software design of the OBC mainly depends on the mission of the CubeSat. ISRASAT1 is a research project at the Institute of Space Research and Aerospace (ISRA) in order to develop a CubeSat that sends image, beacon and telemetry data to the ground station.