[PD] Arduino, any feedback to help me choose the model?

[Pedro Lopes]

Beware that analogue inputs (can) have noise (they fluctuate a little).
The analogRead() command converts the input voltage range, 0 to 5 volts, to
a digital value between 0 and 1023.

If you can settle with 12 inputs the Uno will suffice:
http://arduino.cc/en/Main/ArduinoBoardUno


p.s.: Multiplexing/de-multiplexing is the ability of addressing (or
conversely be addressed) of several outputs with fewer inputs. You have
chips that do that, example with 3 binary digits you can multiplex to 8
outputs, with 000 being the first, 001 the second, etc,.. up to the 111,
which would be the 8th. People also call it MUX and DEMUX.

On Sun, Apr 10, 2011 at 2:44 PM, Pierre Massat <pimassat at gmail.com> wrote:

> Hi Pedro, thank you for this quick response.
> - Yes, size does matter, because it all needs to fit in a stombox. But the
> boards don't seem to be to large anyway...
> - Price matters too (i'm not gonna buy the one at at 130 or something).
> - What is multiplex? I need something like 12 simple switches (digital
> inputs??), and maybe 3 or 4 analog inputs (i v'e read on their website that
> one can have up to 6, is that right?). The only thing that really matters
> concerning the analog inputs is the "resolution". I just read somwhere on
> their website that one board outputs integers from 0 to a little more than
> 1000 for it's analog inputs. If this is true, this would mean than i would
> get a resolution that's a little less than 10 times higher than that of my
> gamepad. But there seems to be different boards with different a difference
> resolution (i'm assuming it's 8, 16 or 32 bit, am i right?). I don't know if
> i can order any pre-assembled model with any board.
>
> I also saw that the board could power LEDs. This could be very interesting,
> because i'm going to assign a switch to the connection of the expression
> pedal (analog) with certain parts of my patch. So for instance at startup
> the pedal controls effect 1, and if i push the button i goes to effect 2,
> etc., and only goes back to effect 1 after it's reached the last
> pedal-controlled effect. So it'd be nice to have one LED for each effect on
> my stompbox so that i know exactly which one is currently controlled by the
> pedal. Do you think I could program this easily?
>
> Pierre
>
> 2011/4/10 Pedro Lopes <pedro.lopes at ist.utl.pt>
>
>> They have a lot of models (not accounting for spin-offs done by other
>> folks, which some are great - long live open hardware), I think there are
>> some more parameters for choosing an arduino model:
>> - Does size matters?
>> - Does price matters?
>> - 8 buttons + 1 potentiometer (in a pedal). Extendability up to 12.
>>   - do you wanna multiplex[1], or simple coding?
>>
>>  Maybe if you really want a lot of inputs, Duemillianuove will not
>> suffice, and maybe Mega is the way to go, but its more expensive and
>> bigger.
>>
>> [1] http://www.arduino.cc/playground/Learning/4051
>>
>> On Sun, Apr 10, 2011 at 2:14 PM, Pierre Massat <pimassat at gmail.com>wrote:
>>
>>> Hi all,
>>> I sorry to start yet another thread about arduino, but i'm too lazy to
>>> search the archives and i suppose that they are upgrading the different
>>> models frequently.
>>> I have been using a hacked gamepad-turned-stompbox to control my live
>>> patches, and right now i feel that it's time to build something else that
>>> would suit my needs more closely.
>>> I have to choose between a decent gamepad that i could hack and a arduino
>>> board. Only, i don't know anything about arduino. So it'd be nice if a list
>>> member could help me a little bit.
>>> Here's what i have right now :
>>> - 8 buttons + 1 potentiometer (in a pedal).
>>> I'd like to have more buttons (I could have 12 using the game controller,
>>> can i have more with a arduino board?). And it'd be nice if could have more
>>> "analog" pots (i could have up to 4 using the gamepad, but they're hard to
>>> solder...).
>>> Also, i'd like to know the "resolution" of the analog inputs of a arduino
>>> board. Is it higher than that of a gamepad? That'd be cool because i could
>>> have a smoother control over certain values in my patch.
>>>
>>> And finally, what do i need to connect the arduino board to Pd? Is it the
>>> HID object or something different?
>>>
>>> Any help welcome.
>>>
>>> Cheers!
>>>
>>> Pierre
>>>
>>> _______________________________________________
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>>>
>>>
>>
>>
>> --
>> Pedro Lopes (MSc)
>> contact: pedro.lopes at ist.utl.pt
>> website: http://web.ist.utl.pt/Pedro.Lopes /
>> http://pedrolopesresearch.wordpress.com/ |
>> http://twitter.com/plopesresearch
>>
>
>


-- 
Pedro Lopes (MSc)
contact: pedro.lopes at ist.utl.pt
website: http://web.ist.utl.pt/Pedro.Lopes /
http://pedrolopesresearch.wordpress.com/ | http://twitter.com/plopesresearch
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