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Topic: Schematic for Word-Clock using Arduino UNO (Read 1 time) previous topic - next topic

max713

Hi guys,
I am making a wordclock with an LED matrix, please check the schematics for any mistakes.
Thanks!!

Max

HazardsMind


max713

alright, thanks!
I just wanted to get sure because the board will already be etched on friday

HazardsMind

WAIT, did you test it first? Just because I don't see anything wrong with it, does not mean there is nothing wrong. You always need to test and re-test first, before you make a board.

Graynomad

I'd be e bit worried about the current-sourcing ability of the '595s, they really aren't designed to drive LED statically and if you're multiplexing you need more current than usual. IIRC they can source maybe 6-7mA, check it out.

You may find the LEDs won't be bright enough.

______
Rob
Rob Gray aka the GRAYnomad www.robgray.com

max713

That's why I have the Darlington Arrays

Graynomad

Quote
I have the Darlington Arrays

For sinking the rows, it's sourcing the columns I'm on about.

You know there are single chips that do this and more, for example the AS1130.

_____
Rob
Rob Gray aka the GRAYnomad www.robgray.com

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