28 Dec
2012
28 Dec
'12
9:31 p.m.
On 12/28/2012 08:32 PM, Dave McGuire wrote:
Did you mean a "DI"? What issue was that
in? That sounds like a
great hack.
The trick I always use, which assumes use with a microcontroller, is
to interrupt with one line and check the state of the other line in the
ISR. That works nicely. But pulses on one or the other of two lines
would make a really nice drive mechanism for tap-up/tap-down-interface
digipots.
It was ED, not EDN (whoops), but here's the article:
http://tinyurl.com/ckznjw7
I love those things--like the one that allows you to drive a chain of
LEDs with only a single I/O on an MCU.
--Chuck