Hello friends! Today, we will interface a seven-segment display with the 8051 microcontroller and use it to show the digits zero through nine. This is a useful first display project because you can trace every visible segment back to one output bit in your program. We will use the AT89C51 and examine the original Proteus circuit with its 74LS245 buffer. Before writing the code, we will identify the display type, build a digit table and calculate the timing. We will also correct an important issue in the historical schematic: LED segments need individual current-limiting resistors. The original screenshots and project download remain available below. They are useful references for the simulation, but some details need care when moving to hardware. In particular, the displayed circuit and ac ...