This is an automatic quiz buzzer system in which if more than one team presses the buzzer, the accurate delay time is taken into account and the number is displayed. Here is the simple circuit diagram ...

Program the Microcontroller: For real hardware applications, upload the HEX file to the AT89C51 microcontroller using a compatible programmer. Test the Circuit: Assemble the hardware according to the ...

Microcontroller Unit (AT89C51) Seven-Segment LED Display Push-Button Interface for Start/Stop Control Clock Oscillator for Timing Power Supply & PCB Layout Schematic Diagram ...