28 Dec
2012
28 Dec
'12
8:32 p.m.
On 12/28/2012 11:08 PM, Chuck Guzis wrote:
Did you catch the ID in EDN about 6 months ago for a
circuit using a
single 4538 on a rotary encoder that provides pulses on either of two
lines depending on direction? I thought it was very clever--much better
than the usual flip-flop decoder.
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.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA