Arduino and wavetables

[droffset]

Just saw this video of Collin modding a guitar pedal with a digital potentiometer and arduino. He wrote code that uses wavetables and posted the code for free. Maybe it's useful to someone.

http://blog.makezine.com/archive/2009/08/collins_lab_guitar_pedal_modding_wi.html

[State Machine]

Hey thanks for posting that. Enjoyed that !! The Arduino controller boards are fun and fairly powerful and now that the Arduino MEGA exists, there is plenty of I/O and A/D channels to play with.

http://www.sparkfun.com/commerce/product_info.php?products_id=9152

http://www.arduino.cc/

Bill

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[okvern]

Hi droffset, State Machine,

Speaking of Arduino variants--I'm really looking forward to getting one of these:

http://blogs.leaflabs.com/

Thanks,

Ole

[slabman]

I want the maple & oak!

[State Machine]

[Narbotic]

@droffset - It's nice to randomly come across your own work posted here =]
Thanks for that - I'll have more sound/synth experiment vids up soon

I'm pretty psyched about the Maple board - which is apparently shipping at the end of this month. Jumping from an ATMega @16MHz up to an ARM @ 72MHz is a little mind blowing! I was finally getting accustomed to the limitations with audio interrupts on Arduino - oh well!

[droffset]

Wow I've been gone too long, good stuff Collin!

okvern & State Machine It looks like the Maple has shipped, have you guys gotten a hold of it yet?

[Narbotic]

I did acquire me a Maple and wrote up some early impressions over @ makezine -
http://blog.makezine.com/archive/2010/01/arduino_vs_maple_-_early_impression.html

suffice it to say, it performs at least some of the Arduino library functions around 9 times as fast as the Arduino Duemilanove
I'm guessing this greater-than-expected speediness is due in part to their implementation of the digitalWrite/Read function.

The LeafLabs crew is still banging away @ a final release of the software install for OS X & Windows - but they seem very close. You can check out much of their progress in piecemeal on their forums -
http://leaflabs.com/tiki-view_forum.php?forumId=3

[defex]

I have it working with MIDI. on an arduino mega. this can currently generate 3 differently tuned oscillators, each can play a different pitch and wavetable (with detune, sync and glide), and also generate 2 envelopes as well, I think i can push it to do a couple of LFOs. so far I have 9 wavetables, but i will make more when I am finished with it, it takes too long to upload them each time i make a change.

I have used parallel DACs on the output (envelope PWM controls DAC reference voltage) i am still looking in to multiplexing DACs so i dont have to use so many pins.

also the filter board in the video is a dual one, but i am only using one filter IC.

The second arduino is there to get data for debugging and display it, but now i have decided to use it as a MIDI controller for the waveteble generator, and take all the potentiometers off the mega.

http://www.youtube.com/watch?v=1rAw8MmHKtw

the code was originally based on this:
http://adrianfreed.com/content/arduino-sketch-high-frequency-precision-sine-wave-tone-sound-synthesis (with permission.)

eventually i hope to design an easilly buildable "sheild" with 2 DACs, PWM filtering, VCF, MIDI in, and audio out.

[cappy2112]

[oldmanfury]

My version here:

http://buzzville.typepad.com/oldmanfury/2010/03/my-first-arduino-project-the-voltage-controlled-grunge-pedal.html

Mine is CV - no wavetables (by design) and on a "lesser" pedal than Collin's. Works great. I'll post a video some day when I get time.

[Narbotic]

[oldmanfury]