Hello friends! Today, we are going to build an LED blinking project using an 8051 microcontroller in Proteus. This is a useful first exercise because it connects a short C program with something we can immediately observe: an output pin repeatedly switching an LED on and off. We will use the AT89C52, which belongs to the 8051 family, and keep the original project's 16 MHz clock and P1.0 LED connection. I will explain the supporting circuit first, then show how to create the program in Keil, generate a HEX file and load it into the simulation. The original simulation and download remain available below. The updated example uses Timer0 for an understandable delay instead of relying on an empty software loop. That gives us a practical introduction to both digital outputs and the relationship ...