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

[Pedro Lopes]

Battery: yes. I use like this:
http://www.arduino.cc/playground/Learning/9VBatteryAdapter


Pot: whatever suits you, try with a 1kOhm pot for starting up. There's
different curves to it: lin (linear) and log (logaritmic) - this will show
on how the pot reacts when turned, thus how the levels rise and lower when
you move it (p.s. never used a exp (exponential) but should be more esoteric
to find.)


On Tue, Apr 26, 2011 at 10:28 PM, Pierre Massat <pimassat at gmail.com> wrote:

> Hi,
> I just got my Uno in the mail today. It's so cool! I'm all excited.
> I've been searching their website for some basic info regarding he
> components i should use, but haven't found anything.
> Do you know if i could use just any pot? Or is there a specific value i
> should use? Also, can i use a battery for power?
> It seems like their tutorials are mainly about programming the boards, and
> not so much about interfacing them with the real world. And as of 2011 Tron
> is still just pure fiction, and guess what, i'm still plain real.
>
> Thank you all very much for your advice!
>
> Pierre
>
>
> 2011/4/16 Martin Peach <martin.peach at sympatico.ca>
>
>> On 2011-04-16 07:09, Pierre Massat wrote:
>>
>>> Hi,
>>> I just ordered a Uno, i think it will suffice.
>>>
>>> Martin, I'd like to replace my pot with an optical sensor if it's
>>> quieter. Only i've never used one. How does it work? How do i put this
>>> in the pedal?
>>>
>>>
>> I got a reflective sensor which consists of an IR LED and a photo
>> transistor in one package, with both components facing in one direction like
>> the Vishay TCRT5000L:
>>
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=751-1034-5-ND
>>
>> You put a 10 kOhm or so resistor to 5V on the collector of the transistor
>> (bigger resistor = more sensitivity but adds noise) and a 330 Ohm resistor
>> from 5V to the anode of the LED (smaller resistor = more sensitivity but
>> don't burn out the LED), the other two pins to ground. Then connect the
>> transistor collector to an arduino analog in.
>>
>> Mechanically, mount the device so it's looking up at the underside of the
>> pedal and adjust things until you get a good range of values. It may help to
>> stick some reflective material on the pedal, for greater sensing range.
>>
>> These kinds of sensors are used a lot in printers to detect paper, so if
>> you pull apart old printers that's one thing to look for, besides the
>> motors.
>>
>> Martin
>>
>>
>


-- 
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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