pic16f877 + max 7221

[l2_star]

I want to create a news ticker on 64 LEDs, with the possibility of adding an additional 64 LEDs.

may those who have finished projects

would be happy ..

example (http://www.radiokot.ru/circuit/light/run/23/)

[Kamikaze47]

You shouldn't need any additional chips than a 40-pin pic and 8 transistors.

A grid of 8 rows and 16 columns of LEDS with a transistor driving each row will let you control 128 LEDs from 24 I/O pins.

I have done this successfully with an 11x16 grid for 176 LEDs on a 40-pin PIC.

*edit* Depending on how much current you want to run your LEDs at, you may need transistors on the columns too.