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?
Looks like i'm not nearly through asking questions about arduino... Pierre 2011/4/10 Martin Peach <[email protected]> > Probably the thing will read quieter if the pots are lower resistance. The > data sheet for the atmega microcontroller used in the arduino says hat the > impedance of the analog source should be less than 10kOhm. Also putting a > .1uF capacitor from the analog pin to ground will smooth out glitchy noise. > (And averaging a few values in software helps too.) > > The arduino can send its data as MIDI by using two 220 Ohm resistors (one > from 5V to MIDI pin 4, the other from TX to MIDI pin 5, ground to pin 3) and > a baud rate of 31250. That can eliminate noise caused by the USB connection, > but you have to program the MIDI messages yourself instead of using pduino, > as well as powering the arduino from a battery (quiet) or AC adapter > (noisy). > > I have built a MIDI pedal that uses an optical sensor to detect the pedal > position. It is much quieter than a potentiometer. > > Martin > > > On 2011-04-10 10:56, Pedro Lopes wrote: > >> You can filter out some noise if that happens. I have done several >> arduino projects (namely public installations or sculptures with >> sensors), one thing I learned is that you can always filter the (some) >> noise, by ignoring some values and so forth. >> Another fun aspect is that in public installations whenever I connected >> the arduino to the AC power outlets (instead of battery) the noise was >> much higher. (which makes sense, since AC powers of houses, steet, etc.. >> are actually noisy (have you ever noticed that AC induces noise on most >> laptop on-board sound-cards - due to ground loop and so forth) ) >> >> >use i wanted to use a pot to control a delay length (you can hear >> gliches if the delay length jumps from one value to another rapidly). >> But don't panic about it, its workable. You can defined thresholds, and >> if it varies withing a certain range you will not consider as the pot >> has moved, if you do not have noise: even better. But electricity is not >> perfect, components are definitely not perfect either :) >> >> Best, >> Pedro >> >> On Sun, Apr 10, 2011 at 3:50 PM, Pierre Massat <[email protected] >> <mailto:[email protected]>> wrote: >> >> uctuate a little"? This could be anoying if they fluctuate too much, >> because i wanted to use a pot to control a delay length (you can >> hear gliches if the delay length jumps from one value to another >> rapidly). >> >> >> >> >> -- >> Pedro Lopes (MSc) >> contact: [email protected] <mailto:[email protected]> >> >> website: http://web.ist.utl.pt/Pedro.Lopes / >> http://pedrolopesresearch.wordpress.com/ | >> http://twitter.com/plopesresearch >> >> >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> > >
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