5 Jul
2014
5 Jul
'14
9:03 p.m.
On Sat, Jul 05, 2014 at 10:17:21AM -0700, Len Ovens wrote:
I do want to try the rotary encoder though. either
with a large
wheel (actually 2-3inch is not that big) or belt with no LED strip.
The on screen fader position should be good enough.
In case you'd consider the motorised fader, there's an Arduino
project using it:
http://blog.codyhazelwood.me/motorized-faders-and-the-arduino/
There's one problem with this: the author has the H-bridge
'enable' pin hardwired. This means that the motor always
sees a low-impedance voltage source. The voltage can be
zero, but that will make the motor resist movement.
When the fader is 'touched', the motor should be open-circuit,
so the H-bridge should be disabled, this takes one more pin on
the controller.
You could actually control the 'resistance' of the fader
by pulse-width modulating the enable pins of the bridge.
To control many faders you'd need some external logic to
multiplex the Arduino's logic pins, but otherwise everything
is there.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)