LED Hacking Night recap

Image credit: Jim Williams

We had a great time on Tuesday night hacking on the scrolling LED display that Jim brought.  It was a great exercise in figuring out how the design worked and trying to improve upon it. Thanks to all who came out and had fun with us!  We like having nights like this, so anyone out there who wants to do something similar with us, let us know!  (Email info@workshop88.com or leave comments here on the blog.)

Jim has already posted a much better summary of what we did on his blog.  Check it out!

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One thought on “LED Hacking Night recap

  1. Watch the max values on that 74hc164, looks like it will source or sink 20 ma on each output *but* the whole chip is limited to 50 ma total. If you expect 20 ma to each LED, you will need buffer transistors.

    Digikey has this, looks promising for this project:
    http://www.micrel.com/_PDF/mm5450.pdf
    35 outputs @ 15 ma each in a 40 pin DIP for $4.39. Has brightness control and a latching scheme so the display doesn’t go random while you’re loading it.

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