#21

I’m also following this topic with interest - just about to try doing the Raspberry Pi i2c out to Just Friends.

from what @tehn was saying earlier it’s a straight forward 3 wire connection. I was wondering if there needs to be a logic level adjustment from 3.3v to 5v for i2c between a Pi and JF (or any other Monome or Mangrove modules) or are they all in the same voltage?

It seems this is an issue if you are doing i2c between a Pi and an arduino - see here https://learn.sparkfun.com/tutorials/bi-directional-logic-level-converter-hookup-guide - so I thought i should check before I go plugging anything together.

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#22

All monome & Mannequins modules supporting i2c use a 3v3 level connection.
I believe that’s what rPI uses to, but please confirm beforehand! Off hand, I think the i2c pins on stm32f4/7 series (used on JF / W/) are 5v safe, but I would have to doublecheck.

#23

Thanks @Galapagoose !

That is really useful to know. Having just got my v1 JF back from having it’s Run jack updated (much appreciated btw!!!) I’d hate to mess anything up by plugging in the wrong thing.

Heard such a great demo of JF polyphonic mode via TT the other day, I’m really keen to explore it. But I’ll have a read up on the STM data sheets you mention - out of interest more than anything - and I’ll be double checking the I2C output from the Pi in any case to make sure it is 3.3v.

My RPi is currently in another rack at the moment, so I’m still thinking about what makes for a good i2c connection cable across to the JF since they don’t normally sit next to each other.

Looks like the FaderBank crew are looking at using a TRRS cable for the i2c output. i’ve wondered if repurposing a (mini) usb cable might be better (so that various contacts aren’t scraping past each other) although if i understand correctly i2c connections should only be made when everything is powered off so maybe it no difference.

#24

This is an interesting prospect, curious to see what people come up with. If there is MIDI control for JF it would be rad to use something like Lemur on an iPad to control the extra functionality of JT. Neat!

#25

I’d be tempted to wait and see what crows brings for JF functionality. That would be a USB->LUA->I2c link, probably with built-in support for the existing II ecosystem.

6 Likes
#26

Anyone knows any news about such a mod?
Is someone working on that? It would be a dream
All or most i would want from TT is opening up Just Type and it seems like a heavy rocky road for this.
I cant control a big system anyway since 56hp isnt a lot:)

If one would get Ansible or telexi, there could be sooner or later a firmware flash to add just type?

#27

Reviving, also curious about this.

#28

There is some interesting stuff going on the with orca on monome trilogy and ansible controlling just friends.

4 Likes
#29

I’d love this. I never paid any attention to Teletype before I bought my JF and it’s hard not to feel a little resentment at how much functionality is hidden away from people who aren’t connecting a teletype.

#30

Do not despair! Eventually crow should fulfill that need.

#31

@scanner_darkly is currently writing firmware for any monome module to control Just Friends over I2C as well, although that route would require a grid

1 Like
#32

the easiest route is really telexi, you’d get 4 cv inputs that you could use as 1V/Oct (and the knobs could serve as coarse pitch controls). you’d need to mod the firmware but it would be really trivial.

4 Likes
#33

I’m very close to panic-purchasing a grid and norns, so game on

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