Mini K-Ceptor design

valor

The whole suit seems to be alive 😀 . How do I "unlock" the cubes and link them to the female body parts to make her reflect the suits motions?
(right arm sensors stationary on a table)

valor

The Mini HUB enclosure came out fine, i think. I've even added a light pipe for the RGB LED 🙂

daylanKifky

Press ENTER to end calibration and enter capture mode.
More info here: https://wiki.chordata.cc/wiki/User_Manual/5._Capturing

valor

daylanKifky Oh cool, Thanks. I'll try it tomorrow.

Btw, I've committed the STL files to the github.

AxonSpark

valor I'll be interested to see your results. I've been having a sideways knee bending issue on the left leg that persists even if K-Ceptors are changed out.

valor

It's been very quite few weeks as we have been hit with cold and flue.

AxonSpark I've not had any problems with the knees bending with the calibrated sensors. I still need to calibrate all other sensors and I've to do it in "quite" location. My workshop is filled with equipment some of which is running 24/7.

Hi Flavia , nice to meet you too and thanks for your feedback. Thank you for posting an update which mentioned my version 🙂

Flavia

Hello @valor , I'm Flavia, the Social Media Manager of Chordata, nice to meet you! First, let me tell you that what you're doing is incredible work! Congratulations on all the Chordata team. We wanted to show on Chordata's social media your amazing contribution, so today we publish a post with a brief explanation of the mini k-ceptors and hub you developed. I hope you like it! This is the Facebook link in case you want to share it, but you'll also find this post on Instagram, Twitter, and Linkedin:

AxonSpark

valor Weird. I don't know what's causing that knee issue. I just posted some new tests (and now they're both bending sideways): https://forum.chordata.cc/d/51-test-1/61

Hopefully @daylanKifky will have an idea of what's going on with that. How accurate are your arm/hand positions? Clapping or resting my hands on my head isn't too accurate, but that might come down to me changing the model/bones to better reflect my proportions.

valor

In one of the posts above I wrote

All of the resistors are not 0805.

This was an error which I could not edit out.
the correct version is of course:

All of the resistors are NOW 0805.

Could an editor edit my post?

valor

AxonSpark
I will probably test out the suite again when I get some time next week. On the last GIF you can probably see that the right hand sensors resting on table are virtually stationary did not drift much at all.

Could it be that sensor itself is loose? How are you mouting them? Velcro, Elastic band or...?
For convenience while testing I have my HUB and RasPI mounted on a spare Airsoft plate carrier vest which I had lying around. The side pocket of the vest can carry a couple of USB powerbanks.

For Mini K-ceptors I've printed clips in which the sensors click-fit. The clips are then just super-glued to an elastic band.

daylanKifky

Hey @valor
Did you noticed any downgrading of the wifi signal of the raspberry when placing the hub on top of it?

valor

daylanKifky
Not really. There has to be some effect but considering that the hub is not exactly on top the wifi block and that there is 15mm height between the planes the effect might not be critical.
However, I have not checked the signal levels. So this has to be studied more closely.

Dodo2207

valor
Awsome project valor.
I want rebuild the version of your project too.

In your partlist is digikey with the same first few items as Mouser.
Is it a price comparison?

Where do you order your pcb?

Do you use the same parts for the hub as the coredata hub with just a smaller pcb?

thanks for the awsome project as well to the coredata team

Dominik

valor

Dodo2207
Hi Dominik,
Thanks a lot. The BOM for the Mini-K ceptors included the Digikey just for price comparison, I've ordered my parts from Mouser, but ordering the passives from LCSC.
The PCB's were ordered from JLCPCB. Great value for the money.
The Mini-HUB parts are slightly different, mostly the packaging of the IC and the passive components is smaller and the modular jacks I used are different from the original Chrodata Hub.
I have not had time to make the BOM for my Mini HUB but I will try to do so during this weekend.
Meanwhile, you can start 3D printing the casings 😃
Regards,
Val

Dodo2207

Hi valor,
I orderd the pcbs already. Sadly it need 7-10 workdays.
It would be awsome if you could help me later on the working process. Its my first electrical project 🙂
Ill create a thread later for it.

Are you able to show what your suitversion can do? Like a short mocap animation?

regards Dominik

valor

Dodo2207
Hi Dominik,
Have you received your parts? 🙂
I haven't gotten arount to capturing any motion as I've been busy. But let me know if you have any issues with the build itself.

regards,
Valor

Dodo2207

Hi Valor,
I got everything else, but the pcbs need a few more days for arrive.

Did you published the hub and the parts for it?
That would be awsome 😁👍

Do you have some tips for an beginner of smd soldering?

Did you use soldering paste or soldering wire? Any suggestions?

Thanks for your offer, I will create a new thread then abd I would definetly need your help 👍.

valor

Dodo2207
that's cool Dominik,
The Mini HUB is published but I've not had time to make a nice BOM for it. But you can check the parts from the schematics and the board which I shared on EasyEDA.

Here's an assembly cheeat sheet for the Mini K-Ceptors.

I've used solderpaste but without a stencil since I have a Nordson EFD paste dispenser and so I was able to place the solder on all pads cleanly.

Using a solder paste method, with an oven makes it a lot easier. The IMU chip requires an oven or hot-air method. But the rest of the work you can easily get done with a fine 0.3-0.4mm solder wire, decent gel-flux and a good solderwick. If you get shorts, just put some flux and retouch the pins with the tip of your soldering iron, if it does not help due to excessive solder, just remove some of it with a solder wick.

Dodo2207

Hi Valor,

thanks for the blueprint and tips.
I have some trouble with knowing which parts I need to order for the hub.
Are you able to provide the names or orderlist of the components?
Most of the parts on Easy EDA arent orderble.

daylanKifky

Just a clarification:
The LSM9DS part should be labeled LSM9DS1 in order to avoid confusion with the the LSM9DS0 which is the deprecated ancestor of this component

valor

daylanKifky good point. I was not aware the deprecated ones were still available. But people should still purchase the parts according to the BOM. The assembly cheat sheet is a rather inconvenient way for making up a shopping list.

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