Welcome to LEDMYLIFE
It's the new version of the previous simple 5x7 LED dot-matrix circuit.
This a small LED dot-matix hardware with 8 coloumns by 8 rows of LEDs. It demonstrates how the LED message board works through the very simplified circuit which is comprised of 64 LEDs, a 8-bit data latch, a 8-bit sink driver, and a ATMega8 microprocessor. They were soldered on a prototyping pcb board.
After I explain how the hardware works altogether in order to get things done, I'll show you some sample codes for displaying any shape you want and how to integrate this LED board with the PC software.
I used AVR STUDIO 5 as the software development tool that can be freely, but you need to register, download from ATMEL company site. It has upgraded from the previous version 4 and included IDE from Microsoft Visual Studio and GNU C compiler.
This is a 7x5 LED dot-matrix with driving circuit. LEDs are connected serially along both rows and columns.
LED0 ~ LED5( the column lines) are connected to the data signals through a 74HC574 and DRV0 ~ DRV6(the row lines) are used as the line driving signals through a 2003A. This circuit uses 1/7 duty driving method that turns on only a row line at a time slice.