[sdiy] Pots vs Encoders, was Re: [sdiy] dave smith *instruments*

[Amos]

Very interesting idea!  You could do the "interpolation" idea with no
extra hardware requirements.  The brightness idea is interesting also,
but you'd need to be creative... 15 pwm channels (one for each LED in
a ring) just for feedback from one pot, would be a bit extravagant.
:-)

You could use one PWM for the whole ring assuming you still only have
one LED lit at a time... But what would brightness mean in this
context? It would make more sense to have a dim LED next to a bright
one, but the you're back into a more hardware-intensive situation.

Excellent food for thought...

-Amos

On 2/3/10, Tom Wiltshire <tom at electricdruid.net> wrote:
> If you used PWM to control the brightness of the LEDs, the 'extra'
> resolution would be the resolution of the PWM - 8 or 10 bit is easily
> possible.
>
> You wouldn't be able to tell much beyond 16 or 32 levels though, I'd
> have thought. The effect would just get smoother looking. Still, it's
> a good idea.
>
> T.
>
>
> On 3 Feb 2010, at 23:39, cheater cheater wrote:
>
>> I wonder what is actually the maximum bit depth available with this
>> sort of approach. Anyone know what the accuracy improvement with this
>> sort of... hmm.. how do we call this? Anti-aliasing? Interpolation?
>>
>> D.
>>
>> On Wed, Feb 3, 2010 at 21:26, Ingo Debus <igg.debus at t-online.de>
>> wrote:
>>>
>>> Am 02.02.2010 um 15:22 schrieb Tom Wiltshire:
>>>
>>>>  you typically get 15 or 31 LEDs around the ring, which is 5-bit
>>>> accuracy
>>>> at best
>>>
>>> Only if you allow only one LED lit at a time. If you allow one or
>>> two lit
>>> (one = spot on, two = value is in between) you get almost twice the
>>> resolution. If you can control the LEDs' brightness you can get
>>> even more.
>>>
>>> Ingo
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