led matrix pic 16f84 and 4017 help me please


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  1. #8
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    May 2009
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    Quote Originally Posted by Darrel Taylor View Post
    If that's a CD4017, then it can only source about 0.36 ma @ 5V. That's not enough to drive 1 LED, let alone 5.

    If it's a 74HC4017, then it can drive 25 ma. Good enough for 1, maybe 2 LED's, or 5 DIM ones.

    Some transistors or darlingtons would help.
    You might want some resistors in series with the 5 cathodes too.
    <br>
    thank u for reply i know that ,but i wanted to know how i write the pulse to 4017 ,i will change the schematic and i take off tc4017 and i use 8x5 led matrix it will be easy to drive anyway thank you Darrel Taylor & joe S & Mackrackit for helping me .
    Last edited by Mus.me; - 14th July 2009 at 00:55.

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