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/)
pic16f877 + max 7221
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/)
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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.
Last edited by Kamikaze47; - 10th February 2010 at 14:49.
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