• The Seven-segment display is connected in common anode mode and interfaced to the microcontroller for displaying the timing information.
• The microcontroller has inbuilt flash EPROM memory to store the data that remains even after power failure.
• The microcontroller is programmed in such a way that it accepts the real timing and bell timings and correspondingly sends the controls signals to the seven-segment display and also to the transistor connected to the relay coil.
• When the relay transistor is enabled, it energizes the relay coil so that the path is closed to power the bell device.
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Prior to working with this system we have to configure the real time and bell time values using a matrix keypad. The procedure for the configuration is given below: This system uses a power-supply block to drive all the circuit components, an 8051 microcontroller to control and manage bell timings, a real-time clock for accurate timing operation, a matrix keypad to enter and configure the bell timings 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, wherein the keypad entered timings are stored in the microcontroller, which are responsible for operating the bell based on the program of the microcontroller.