12-04-2017, 12:22 PM
Usually, conventional methods require a pawn or bell operator to assist and operate the bell system for each period and interval in schools and institutions. Such systems need sufficient human effort to do so, and require an advance to be automated - those that minimize human effort. As the bell system is important in schools, homes and industries, the automatic operation of this instrument must be done with a precise time controller in an economical manner.
![[Image: 2.jpg]](https://www.elprocus.com/wp-content/uploads/2014/06/2.jpg)
This automatic school bell timer system is designed using a basic 8051 microcontroller to manage time intervals. The read / write memory is also required to store bell timings, but for less number of times this memory is not required. This system also provides the display of seven-segment time display information for a user interface purpose. This system uses a power supply block to drive all components of the circuit, an 8051 microcontroller to control and manage bell timings, A real-time clock For precise synchronization operation, a matrix keyboard to enter and set the bell times and a seven-segment display to display the time and information. The operation of this system can be easily understood from the above block diagram, in which the times entered on the keyboard are stored in the microcontroller, which are responsible for operating the bell based on the microcontroller program.
