#1269

I bought a second hand txi from someone online used and it arrived in many pieces. The teensy is minorly bent and all prongs to attach the back board (euro one) are broke off or bent.
Mostly it looks fixable? But I haven’t built a txi. I’m super bummed.
Any ideas anyone on a repair? I built a radio music module and some of the parts look similar.

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Ps I got a full refund. Supposedly the txi I got is a newer one. How do I check this?

#1270

There hasn’t been a revision to the TXi, just TXo.

Your module looks repairable by someone of modest soldering skills. Frustrating, but easy. If it were my job I would start by snipping all the black plastic off the damaged headers to expose the pins. Then probably pull them out one at a time, clean up the holes with a solder sucker, and install new ones.

#1271

Hello
I am having problems with my I2c stability
It’s crashing a lot nowadays
I am trying to connect 1 teletype, 1 txo, 1 txi,
1 just friends, 2 w/s, 1 txb, and 1 Faderbank to the txb
It has always been finicky but since I added my Faderbank last weekend it’s horrible
Even without it plugged in
The whole system hangs now after any command
I am contemplating re-wiring My I2c bus. I guess I’m asking where do I buy the wires and what order should I connect it?
Does anyone still suggest jumping the I2c from one unit to the next ?

#1272

I absolutely do. Keep all of the cabling as short as possible - especially the stereo cable going to the 16n. I usually put all of my modules next to each other and use super-short jumpers between them.

The little fellow at the top is the one I use - 10cm; the bottom one is 20cm, for reference.

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I’ve also played with adding additional pull-up to a big bus, but I have to say this is a “do at your own risk” kind of thing. It may put too much strain on the microprocessors in the chain. I’ve only experimented with it and have been able to cable up some weird things, like this:

154 Likes, 6 Comments - Brendon Cassidy (@bpcmusic) on Instagram: “Finally let myself make some sound today. Been a while. Took a crappy week (and finally finishing…”

Bus includes:

Teletype
TXo
TXi
3 x TXb
2 x w/
ER-301

In getting this stable, I connected more than one TXb to power. And it was stable - just fussy about boot order.

AGAIN - do this at your own risk. This is voodoo science land with potential harsh repercussions.

5 Likes
#1273

Thanks for the reply
3 more questions
Do you know where I can get the components to make the cables?
Does everything connect to the teletype or txb?
And on the back of some modules they have 6 pins 3 for in
3 for out?

#1274

They are jumpers; I buy them on Amazon, but most electronic hobbyist sites should carry them too (Adafruit/Sparkfun). You want to get female to female. I use a little shrink wrap to bind the ends, but you could use electrical tape or something similar.

It can, but I don’t recommend that for large setups like yours. Connect each piece to its neighbor. (See below.)

There is no “in” or “out” designation with i2c. Most modules have two rows of pins. You can use the columns interchangeably (or bridge them using a ribbon cable with 2x3 connectors).

I personally break off three jumper wires and bind the ends. I also mark the orientation to identify my ground wire. Then, I just jump from module to module until they are all connected to each other (again, making sure the ground wire is in the proper place for the module in question).

Lots more tips here: A user's guide to i2c

#1275

You are the bees knees thank you

1 Like
#1276

here is a shot from the guide of @scanner_darkly’s super-clean module jumpering:

125 Likes, 8 Comments - scanner darkly (@scanner_darkly_) on Instagram: “what’s i2c and how is it used within #monome ecosystem? what can you do with it? how do you set it…”

Look to the far right at the batch of TXo. That’s what I’m talking about! :slight_smile:

11 Likes
#1277

I started dissecting my rig
And I noticed I also have the slashes board hooked up to the back of my w/s
Is that ok?

#1278

Should be just fine! Slashes conveniently shares both power and I2C between your W/'s.

1 Like
#1279

Which pins is what exactly (on TXb)? Hope it hasnt been asked before, couldnt find it.

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#1280

I’m unable to find a reference to point you towards, but it is, from left to right as in your photo, SDA–SCL–GND (so GND has the whiteish stripe)

1 Like
#1281

Funny how one can leave the most obviously helpful things off the silkscreen and out of the documentation. Sigh. :wink:

The white stripe is ground (thx for answering @alanza). Pin order is answered above (click on the icon to expand - the link to jump):

Sorry.

2 Likes
#1282

I am up and fully running
Thank you very much
Everyone

1 Like
#1284

Not a Teletype user, but TXb, 16n and ER-301.

I was thinking - is it possible to hook TELEXi up with ER-301, when 16n is I2C master?

#1285

I don’t think so: it’s the leader’s job to query followers for data and respond to it, so you would need 16n to be acting as a go-between between ER-301 and the TXI. 16n is certainly not programmed to fill that role.

1 Like
#1286

I have just finished a third build of Telexo +. I never encountered issues with the previous ones but on this one, the TR A does not work. The LED and the trigger are independent so I can visualize the TO.TR.P command but the voltage of this output remains at 0V.

I already tested the connection from the Teensy GPIO to the jack, everything seems correct. Do you think that a faulty IC105 ( SN74AHCT1G125DBVR) might be the cause ? Or could it be something else ?

(Unfortunately, I don’t have any spare SN74AHCT1G125DBVR that’s why I ask before placing an order…)

Thanks.

#1287

I’ve never had a problem with that part in all the TXo that I’ve built. I think it is more likely that you have one of the following issues:

  • Are you sure the signal is getting off the teensy? I’ve had some issues where the precision header pins are being difficult and require a reflow and possibly even some angular pressure in order to ensure 100% contact. Usually a reflow fixes this - but sometimes a slight pin-bend is required.

  • Have you validated continuity across the board interconnects? Maybe you missed soldering a pin (or under soldered it)? Try a reflow if you are unsure.

  • Is your jack pressed right up against the board? In this case, you may have shorted it out to ground (there are ground pins underneath it). I mount mine with a small air gap between the board and the jack while also ensuring that the pins underneath are flush. You can also use an insulator if you want (like a small piece of electrical tape over the pins).

Hopefully this helps. :slight_smile:

b

1 Like
#1288

Thanks for your reply Brendon. Really helpful indeed. Yes, I tested the continuity from the Teensy board to the jack and it seems to be correct despite the low-cost headers I used, I need to check that once again. They’re really not as reliable as the low-profile machined pin headers you use, so I don’t trust them 100% and if you mention you had issues with yours… :-/ I also reflowed many connections following the schematics on Eagle. Worst case scenario: I could try to wire the Teensy pin directly to IC105 (?)

Hmm, that’s interesting… yes it’s pressed against the board, I should test that, too ! That might be the cause of the issue…

Thanks again for your advices :wink:

1 Like
#1289

Ah damn, I slept on these while waiting for delivery of my O|D modules but now that they’re just about here (and I bought a Teletype) I really want a set of the expanders for it.

PCB+Panel sets are fine for me, I’ll look into what kind of order quantities I’d need to just get a set manufactured. Thank you so much for this great set of modules! I’m starting to think I need to look into the Nearness module a lot more :slight_smile:

1 Like