[dorkbotpdx-blabber] Kicked in the Charlieplex part II.

Aaron Burt aaron at bavariati.org
Mon Jan 8 13:04:25 EST 2007


On Mon, Jan 08, 2007 at 03:40:27AM -0800, Donald Delmar Davis wrote:
> So I went to my local dive after a week of having my son out engineer  
> me (never mind the inherent emotional manipulatio) and I tried to  
> reverse engineer the concept thinking that if I could drive 20 leds  
> from a $1 cent tiny chip how many could i drive off of a 28 pin  $4  
> mega chip.  I'll be damned if my napkin skills didnt fail me.
> 
> experiment #1
> repeat the above all ye who still have their hair.

I still haven't, and I'm a freshly-minted BSEE.  I blame PSU. ;)

> experiment #2
> Given a box of >1000 leds for free drive them.
> hc4049, 74hct595, 599 are all less than $1

Ooh!  I like the idea of using the 595, since it's a shift register.
Drive your LEDs with serial!


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