Summary of SCROLLING TEXT CIRCUIT LED MATRIX PIC16F628 74HC595
This article describes a scrolling text marquee circuit using the PIC16F628 microcontroller to drive an 8x80 LED matrix. The system loads up to 128 characters of text from a PC via an RS232 COM port and displays them on the matrix, supporting both Russian and English alphabets along with numbers. It operates at 20 MHz, utilizing 74HC595 shift registers for row control and a 74LS138 decoder with amplifying transistors for column decoding.
Parts used in the Scrolling Text Circuit LED Matrix:
- PIC16F628 Microcontroller
- 8 X 80 LED Matrix
- 74HC595 Shift Registers
- 74LS138 Decoder
- Amplifying Transistor
- RS232 Interface (COM Port)
- Terminal V1.9 Software
Marquee circuit built on the pic16f628 microcontroller circuit 8 X 80 LED matrix used LEDs is being prepared with the source software assembly circuits 74HC595. asm, cod, etc. have proteus isis simulation file. marquee… Electronics Projects, Scrolling Text Circuit LED Matrix PIC16F628 74HC595 “microchip projects, microcontroller projects, pic16f628 projects, “
Marquee circuit built on the pic16f628 microcontroller circuit 8 X 80 LED matrix used LEDs is being prepared with the source software assembly circuits 74HC595. asm, cod, etc. have proteus isis simulation file. marquee circuit computer with rs232 interface for the despatch of an advanced case of kom port communicates using the terminal program.
LED Marquee PIC16F628 This unit plays the text on the LED matrix 8 X 80 LEDs, has a memory 128 characters of text, which are loaded from a PC via COM port using Terminal V1.9. The device has all the uppercase and lowercase letters of the Russian alphabet and numbers, and other characters that you can see in the table below. MCU running at 20 MHz and operates the shift registers 74HC595D, that the logic level 1 lights LED matrix rows and decoder full analog controls through 74LS138 amplifying transistor 8-mu columns of all matrices.
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- 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.
