Arduino 8x8 LED Matrix

Other Hardware LEDs and Multiplexing
1

Hey guys,

actually I'm trying to start a 8x8 LED Matrix, showing "scrolling Letters". This is the "Idea" I tried to follow:

But it doesn't work....

I use:

  • 2x 74HC595N
  • 1x ULN2803A
  • Arduino Uno
  • LED Matrix 1588BS

I don't have the transistors, but I think they are not the reason that it doesn't work.

So if somebody has a clue, I need help!

I attached a picture to this threat, but I think it'S had to see anything on it.

thx for help!

Foto.JPG
Foto.JPG968×1296 276 KB

2

I don't have the transistors, but I think they are not the reason that it doesn't work.

Well I think it is.

Without the transistors you have two problems:-

  1. There is too much current for the chip to take so you will be damaging the chip.
  2. Without the transistors the signals will be inverted, you will have to compensate for that in software. If you have not then it will not work.