Arduino Based Loop Switcher / Amp Switcher / Exp Controller

[aflynt]

Hello!

I finished up this project a week or so ago. It's a programmable true bypass loop switcher, amp channel switcher and Neunaber Slate controller. The logic is controlled using an Arduino Pro Micro from SparkFun and it's housed in a 4Site 1032L from Pedal Parts Plus.

Features:

• ~65mA current draw max (all relays on).
• 3 relay controlled true bypass loops
• 3 relay controlled external switch functions wired to a 5 pin din jack (controls od, boost and reverb on my amp)
• 6 color-coded leds to indicate the current state of the six relays.
• Control over effect and preset on Neunaber Stereo v2 pedals via their expansion port (exp) interface.
• Preset mode (60 presets) - saves the state of the 6 relays and Exp. effect/preset in any of 10 banks of 6 patches.
• Instant Access mode - allows toggling the state of the 6 relays via the six buttons on the right, and cycling through the effects/presets on the Neunaber using the bank up/down switches on the left.
• 10" (W) x 2.6" (D) x 2" (H)

-Aaron

[Martan]

 . I am jealous

[beneharris]

Nice! That is an awesome build!

[copachino]

thats awsome, me wants, did you made the pcbs??

[aflynt]

Thanks! All the purple PCBs are mine, designed in Eagle and fabbed by OSHPark. I breadboarded all the basic circuits first and the created the schematics and board layouts once I had them successfully tested. I used Omnigraffle on the Mac to do the layout of everything in the enclosure.

I of course still messed up some layout things (power polarity, led polarity, regulator pin out, button header spacing, etc...)  I managed to work around all those glitches and get it functional though. I was actually kind of surprised how well it worked once it was up and running. I split the analog and digital grounds and ran them all with 2 pin headers per board to a central "ground board" for a star kind of thing. No hum issues using isolated taps off my Pedal Power for everything, but if running everything off a single OneSpot some pedals have a bit of low frequency hum when engaged. May experiment with different ground schemes at some point, but for my purposes it works perfectly.

-Aaron

[Thomas_H]

Nice job!

[Lubdar]

That's pretty awesome

[nzCdog]

That's epic man, great idea and execution!

[nmbb]

Good ideia!

[aflynt]

Thanks guys!

-Aaron

[stevie1556]

This is absolutely awesome, great work buddy

Sent from my SM-G928F using Tapatalk

[Marshall Arts]

Fantastic - Arduino is such a powerful thing, I built a looper with it some time ago as well (http://www.diystompboxes.com/smfforum/index.php?topic=112106.0). Next thing will be a tap/strum tempo delay (if only I would find the time to take it from working breadboard to produced pcb ;-)).

Best,
Matthias

[bcalla]

Wow, that's an amazing project!  Great work!

[aflynt]

Thanks again everyone!  That's a pretty impressive looking switcher Matthias! I've got looper envy!

-Aaron