FV1 Touch Eurorack

[dathey]

My take on the FV1 Touch / Qubit by leetut:

https://www.diystompboxes.com/smfforum/index.php?topic=122800.msg1159250#msg1159250

https://www.reddit.com/r/diypedals/comments/djqmqn/my_latest_fv1_build/?utm_source=share&utm_medium=web2x&context=3

https://youtu.be/RZMjG5Z1gMA


Mods:
1.) Removed meter function
2.) Added adjustable clock and external feedback controls
3.) Added CV for each of the three main control pots (pots 0-2 per datasheet)
4.) Designed for eurorack

Still a work in progress...

[ElectricDruid]

Very nice! I love this sort of stuff! 

[mark2]

Looks great! Are you doing PWM for the pot inputs?

[dathey]

Thanks, but just expanded on the original scheme, of using single and dual pots, that generated analog 0-3.3vdc signals to the stm32.  Ran out of analog inputs on the bluepill...

[Ice-9]

That's great, I did a similar thing expanding leetut's Qubit to allow for 8 EEPROM chips to give 64 programs. The audio path is a custom preamp which differs to the Qubit. I also removed the ATINY bypass part and added the code to the Bluepill micro dev board instead. I did this because I just really liked the idea and look of the touch screen that letut used with the Qubit.

[dathey]

Trying for 256 effects...wish me luck !

[ElectricDruid]

Wouldn't a better approach for 256 effects be to store all the programs in the uP, connect that to the FV-1 and get it to "fake" the EEPROM? It's only a I2C connection or something, isn't it? And I'm sure there's details of what the FV-1 expects flying around, because I remember seeing it once. Adding yet more EEPROMs seems crazy, especially since each one is a 4K chip, and the FV-1 uses only 128 x 8 = 1K of it. So 3/4ths of each chip is wasted!

[dathey]

Agreed, however, since this is my first foray into programming micro processors, I went with what I knew.

My next approach will be to attempt the Cerebra FV1:

https://youtu.be/m-SGJObDsqk

https://www.dropbox.com/sh/xu3h1muv0b47tbe/AABFHA7vDbswVZ5tQYDD2KEsa?dl=0

[ElectricDruid]

Agreed, however, since this is my first foray into programming micro processors, I went with what I knew.

Fair enough. Good policy!!

My next approach will be to attempt the Cerebra FV1:

https://youtu.be/m-SGJObDsqk

https://www.dropbox.com/sh/xu3h1muv0b47tbe/AABFHA7vDbswVZ5tQYDD2KEsa?dl=0

Yeah, that's the thing! All it needs is the control pots off the other one and it's perfect!

[deadastronaut]

awesome......very cool. 

[dathey]

Proof of concept:

https://youtube.com/shorts/kg6UbN3g5FI?feature=share