Setup and Usage Hardware Setup: Connect the 8051 microcontroller to the 8255 Peripheral Interface Adapter. Connect the 4x4 keypad and 7-segment display to the 8255 interface as per the circuit diagram ...

Connect Rest of the connections are manual which we do in our all circuits. Ground Pin 20. Apply 5 volts to pin 31 and VDD pin in Lcd. Connect Oscillator with pin#19 (XTAL-1) and 18 (XTAL-2) of 8051 ...