Exciting isn't it =) <div><br></div><div>My understanding is that Arduinos in general are pretty robust (which is good because my electronics knowledge is extremely minimal.) I've been using 1K pots with no problems at all. LEDs are another good place to start because they are cheap and easy to see when they are working. Good luck!<br>
<br><div class="gmail_quote">On Wed, Apr 27, 2011 at 5:28 AM, Pierre Massat <span dir="ltr"><<a href="mailto:pimassat@gmail.com">pimassat@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>I just got my Uno in the mail today. It's so cool! I'm all excited. <br>I've been searching their website for some basic info regarding he components i should use, but haven't found anything. <br>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? <br>
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. <br>
<br>Thank you all very much for your advice!<br><font color="#888888"><br>Pierre</font><div><div></div><div class="h5"><br><br><div class="gmail_quote">2011/4/16 Martin Peach <span dir="ltr"><<a href="mailto:martin.peach@sympatico.ca" target="_blank">martin.peach@sympatico.ca</a>></span><br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex"><div>On 2011-04-16 07:09, Pierre Massat wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
Hi,<br>
I just ordered a Uno, i think it will suffice.<br>
<br>
Martin, I'd like to replace my pot with an optical sensor if it's<br>
quieter. Only i've never used one. How does it work? How do i put this<br>
in the pedal?<br>
<br>
</blockquote>
<br></div>
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:<br>
<a href="http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=751-1034-5-ND" target="_blank">http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=751-1034-5-ND</a><br>
<br>
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.<br>
<br>
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.<br>
<br>
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.<br><font color="#888888">
<br>
Martin<br>
<br>
</font></blockquote></div><br>
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