SCROLLING TEXT CIRCUIT LED MATRIX PIC16F628 74HC595

Quick Solutions to Questions related to Scrolling Text Circuit LED Matrix:

• How is text loaded into the device?
  Text is loaded from a PC via a COM port using Terminal V1.9.
• What is the maximum text memory capacity?
  The device has memory for 128 characters of text.
• What speed does the MCU run at?
  The MCU runs at 20 MHz.
• Which components control the logic level 1 to light the rows?
  The shift registers 74HC595D operate the logic level 1 to light the LED matrix rows.
• How are the columns of the matrix controlled?
  A full analog decoder controls the columns through 74LS138 and amplifying transistors.
• Does the system support lowercase letters?
  Yes, the device includes all uppercase and lowercase letters of the Russian alphabet.
• Can the system display numbers?
  Yes, the system supports numbers in addition to letters.
• Is there a simulation file available?
  Yes, a Proteus ISIS simulation file is provided with the project.
• What interface connects the computer to the circuit?
  The circuit uses an RS232 interface to communicate with the computer.