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DIY Stompboxes => Digital & DSP => Topic started by: patricks on December 31, 2023, 11:04:21 PM

Title: Raspberry pi pico projects?
Post by: patricks on December 31, 2023, 11:04:21 PM
I've just found myself in possession of two Pi pico units, and I'm wondering what to do with them. I've looked up a few web pages and found projects for an oscilloscope using an old phone, and a stream deck for OBS, and those are at the top of the list so far but I'm wondering if anyone here has used them for music/music diy projects?

Could they be used for a multi component tester similar to the lce-t4 and lce-tc1 meters, for a MIDI to CV converter, or even a mini synth?
In the box containing the pi units there was also two DFRobot mini mp3 players, and I'm wondering whether these could be used as some sort of delay project, or even a dinky little FM or wavetable synth
Title: Re: Raspberry pi pico projects?
Post by: Ksander on January 01, 2024, 01:50:39 AM
I have some laying around too. They have pretty good specs and may indeed work well for delay/chorus/pitch shifting/... My issues with them are that the datasheet, while extensive, is difficult to understand; programming in Python is not sufficiently precise for audio, and programming in C instead/getting VS code set-up is quite a pain too.

You can find some projects if you Google for them, but last I looked there wasn't too much documentation on them.

I would be interested to see projects here!
Title: Re: Raspberry pi pico projects?
Post by: patricks on January 01, 2024, 03:49:44 AM
The delay/chorus/pitch shift idea sounds fun.
I haven't looked at the spec sheets yet, and don't have a lot of time to learn code enough to write from scratch (most of my projects involving code are copy-paste-modify efforts) though, so that's where it might fall down for me
Title: Re: Raspberry pi pico projects?
Post by: FiveseveN on January 01, 2024, 04:00:56 AM
Quote from: Ksander on January 01, 2024, 01:50:39 AMgetting VS code set-up is quite a pain too
Are you not using PlatformIO?
Title: Re: Raspberry pi pico projects?
Post by: patricks on January 03, 2024, 03:43:35 AM
A few responses from the Synth DIY Facebook group -
MIDI to USB host  (https://github.com/rppicomidi/midi2usbhost)
PicoCore, a lofi bear mangler (https://infinitedigits.co/wares/pikocore/?fbclid=IwAR0pSFpoFxVm00H8GazW5U7wodAJk2uESr0P7ZesU_kzm6_dq32wSpj1cE0)
EuroPi, a programmable euro rack module with multiple ins and outs  (https://github.com/Allen-Synthesis/EuroPi)
MIDI to CV keyboard (https://www.peterzimon.com/cv-keyboard/?fbclid=IwAR0ygglQN68sQLWdAUcD5r5Qjxve2_gg6tpWQh_7uN66gf3hebt_Ta4EFGc)
6 voice paraphonic synth (https://github.com/peterzimon/funk-unit-synth)
PicoSynth, a polyphonic wavetable synth (https://github.com/raybellis/PicoSynth)

Now, what to build first?  :icon_lol:
Title: Re: Raspberry pi pico projects?
Post by: ElectricDruid on January 03, 2024, 03:48:01 AM
Quote from: patricks on January 03, 2024, 03:43:35 AMPicoCore, a lofi bear mangler (https://infinitedigits.co/wares/pikocore/?fbclid=IwAR0pSFpoFxVm00H8GazW5U7wodAJk2uESr0P7ZesU_kzm6_dq32wSpj1cE0)

Poor bears! What did they ever do to you?!?  ;)
Title: Re: Raspberry pi pico projects?
Post by: patricks on January 03, 2024, 11:04:35 AM
Oh no! I love bears!  :icon_lol:
*beat mangler :)
Title: Re: Raspberry pi pico projects?
Post by: Knobby on January 03, 2024, 01:44:42 PM
That 'bear mangler' looks and sounds like fun from the demo video.

On my list of things to look at some day is using a pico to control a zoom multistomp pedal, maybe with the option of an expression pedal input to allow a selected parameter to be controlled.
Title: Re: Raspberry pi pico projects?
Post by: mark2 on January 08, 2024, 10:09:47 PM
I'm using some RP2040 modules to drive OLED screens that I'm putting into a bunch of tap tempo pedals because... no good reason. I have way too many of these screens, so it's just for amusement.

A while back I tried using them in audio pedals, but gave up eventually because the noise was too hard to tame. Maybe someday I'll go back to it, but for now I'll stick them in utility pedals.

Thanks for following up with that list of links. The pikocore and picosynth look like a lot fun!
Title: Re: Raspberry pi pico projects?
Post by: garcho on May 14, 2024, 01:25:53 PM
Quote from: patricks on December 31, 2023, 11:04:21 PMCould they be used for a multi component tester similar to the lce-t4 and lce-tc1 meters, for a MIDI to CV converter, or even a mini synth?

I know it's an old thread, but just in case someone looks for this, Mozzi (https://sensorium.github.io/Mozzi/learn/) is an option.
Title: Re: Raspberry pi pico projects?
Post by: patricks on May 15, 2024, 02:40:23 PM
That's a cool project! Does it work with raspberry pi as well as arduiuno?
Title: Re: Raspberry pi pico projects?
Post by: garcho on May 16, 2024, 10:30:11 PM
Quote from: patricks on May 15, 2024, 02:40:23 PMDoes it work with raspberry pi as well as arduiuno?

It works with the Raspberry Pi Pico board, using the Arduino platform/framework, and if you so choose, the Arduino IDE.
Title: Re: Raspberry pi pico projects?
Post by: garcho on May 16, 2024, 10:32:58 PM
Mozzi is a little... opaque? It can be a dense forest to try and peer in to. But you can make super cool sounds!
Title: Re: Raspberry pi pico projects?
Post by: patricks on May 17, 2024, 01:17:26 AM
Sweet, thanks! Sounds fun! :)
Title: Re: Raspberry pi pico projects?
Post by: Mick Bailey on May 17, 2024, 08:12:43 AM
How does the audio compare with mozzi running in hi-fi mode on an Arduino Nano?