#102

Anyone here have any familiarity with updating an older Meadowphysics to attach the i2c headers? I’m not getting a ton of hits on search and I don’t think that it warrants a new topic. Thanks in advance!

Teletype I2C protocol
#103

Does this page do the trick?

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#104

YES. I knew I’d seen this once upon a time! Thank you so much!

#105

this topic is a better place for i2c related questions: A user's guide to i2c

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#106

Oh that thread taught me everything I know! I just knew I’d seen a detailed breakdown of updating those old trilogy modules.

Excited for your VCV module! Godspeed.

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#108

I hope this is an appropriate location for this question…

Is there anywhere I can find photos or clear graphics indicating exactly which pins have which functions on all the monome and Mannequins modules?

I looked at JF, Ansible, W/ and Crow the other day when I was moving things around to fit Crow in where I wanted it to live… To be honest, it wasn’t super clear what the functions of the pins were… I may not be looking in the right place, of course…

It would be awesome if this information could be collected in one place, hopefully the new Lines index…

Thanks!

#109

Are you asking about which pins are GND/SCL/SDA? They are typically printed directly on the PCB on the back of the module next to the appropriate pins.

As far as what they do, check up at the top post?

#110

I’m saying that I could not reliably find the printing on the modules, I understand what the functions are. I appreciate the link to that description too!

#111

Quick clarification!

I have 8 i2c modules (not counting txb) working fine on my i2c bus currently with a White Whale coming next week and plans to solder the ii headers to my older Meadowphysics.

There’s mention on a few modules in the list of “up to x devices”… does this refer to the number that same device?
eg Which of these statements is true?:
You can chain up to 8 Txo on the same bus
OR
Txo will only work if there are <= 8 devices on the same bus.

tl;dr here’s my i2c case:


The MP doesn’t yet have the headers and a White Whale is en route. Can I run all 10 on the same bus?

#112

assuming the bus itself is stable yeah you should be able to run all 10. the limitation applies specifically to TXo and TXi modules - you can have up to 8 of each (imagine the kind of things you could do with 32 oscillators or LFOs or envelopes or any combination of that : ) - @bpcmusic did run this kind of setup.

for ansible you can have up to 4 connected. earthsea / ww / mp / orca only one of each iirc. pretty sure i ran at least 10 follower modules at some point.

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#113

Perfect! Thank you. I was counting the modules on your bus and got to 8 so I was wondering and wanted to be sure. Ultimately I don’t know that I want to move cases again, so I’ll have to cross my fingers that I can snag one more Txbs from @bpcmusic if he makes them again so I can connect 2 cases.

PS I’m so excited to mess use orca when my WW comes!

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#114

Is this still true with Crow?

#115

Right. That may need an update. But is potentially confusing since crow is configurable

#116

I see that Crow can be a leader or follower, but does that impact its ability to provide power?

^^ crow help: general (connectivity, device q's, ecosystem)
#117

It appears this will depend on how a particular script is configured.

So yes - how the pullups are set will impact this, but Leader/Follower is a different thing from this.

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#118

we just dm’d but i’ll ask here to confirm

if i have crow, w/, and jf on a bus network together i guess i need to always keep pullups on the crow high…true/false?

do i also need a powered board for the bus? or does eurorack power supplied to crow have enough juice for the connected modules ii needs?

edit: nevermind…i see you asked basically the same thing in the other crow specific thread

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#119

Oof, I guess it didn’t occur to me what was happening when people were discussing turning Crow Pullups on/off.

Since you’re only supposed to have 1 source of power, it’s scary that turning pullups on on Crow could cause damage with a Txb (or any other bus power solution like busboard jr or TT backpack) providing power to the rest of the modules.

Unless I’m misunderstanding.

UPDATE: NO DAMAGE. STOP WORRYING.

#120

No damage will be caused. the bus just might not be as stable as it could be.

#121

GREAT! Thank you. Sorry for any paranoia or fear mongering I may have caused

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#122

so i wonder, how difficult it would be to make a version of TXb or something similar that would check if rise/fall time is within a good range and indicate it with an LED?

the main reason it’s difficult to give an advice on pullup values is because in setups with so many variables there isn’t some absolute “good” value, especially when you combine multiple pullup resistors. the end goal is to ensure rise/fall time is within a good range (detailed info here). if you have an oscilloscope you could use that to analyze your bus, but if we had an easier way to measure it it could help more people with troubleshooting and deciding on which pullups should be enabled and whether an additional busboard is needed.

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