Hello friends! Today, we are going to interface a character LCD with an 8051 microcontroller in Proteus. We will use an AT89C51 to send commands and text to the display, then explain how the LCD decides where each character should appear. This is the next step after our 8051 serial communication tutorial . A serial terminal is useful during development, while an LCD lets a project present information directly to its user. Both are valuable when we need to observe values inside an embedded program. The original project actually uses an LM044L-style 20×4 display, so we will follow that arrangement throughout this lesson. A 20×4 LCD has twenty character positions on each of four rows. The same interface principles apply to many 16×2 modules, but their visible layout and row handling are diffe ...