KCeptor R3 design with ICM20948 sensor

daylanKifky

Hi everyone.
As you know with our last Kickstarter campaign we developed the ++ version of the hardware witch brings many improvements and solves some problems with the previous prototypical hardware (KC revision 2.3 and lower).

We are currently developing a new version of the KCeptor conceived to be built at home, the Revision 3.

It will incorporate many of the features of the ++ version like reduced size, RJ45 connectors so you don't have to crimp your own cables and Hub as raspberry HAT. We will also change the sensor on this revision to use the ICM20948. This decision is caused by the current shortage of LSM9DS1 caused by the global semiconductor crisis we are facing. This component seems to be less affected by the crisis than the LSM9DS1, so it's somewhat easier to find.

We will publish the KICAD sources of this new designs as soon as they are ready, and keep you all informed of the progress using this thread

NGWORKS

daylanKifky What an incredible job! That's great!

ShiroSaki

daylanKifky

I changed the mini ceptor's imu to ICM20948. and redesign the pcb.

ShiroSaki

Wow, that's great

daylanKifky

Great!
Note that this release is WIP and the ICM20948 is currently not implemented in the notochord.

Another detail: acording to the ICM20948 datasheet (section 4.4):
The exposed die pad is not required for heat sinking, and should not be soldered to the PCB. Failure to adhere to this rule can induce performance changes due to package thermo-mechanical stress. There is no electrical connection between the pad and the CMOS

ShiroSaki

daylanKifky ok.

daylanKifky

As I said before, you are a fast prototyper 😉

macio787

@ShiroSaki I see your k-ceptors with ICM20948 are ready? The LSM shortage is really halting my college project right now. If possible, could you share your work as of now? Gerbers, or kicad project? I feel kind of bad for asking like this, but time is short and my skills are lacking so I'd really appreciate any kind of help. 😅

ShiroSaki

macio787
The notochord program is not ready and the pcb has some tiny problems.
I will let you know when the pcb is fixed and uploaded.

daylanKifky

On our side the Kicad project is complete, but the board hasn't been tested yet. We can share the files if ou want to give it a try. But as @ShiroSaki said, this sensor is still not implemented in the notochord

Elediko

daylanKifky does it have onboard processor like the kceptor++?

macio787

daylanKifky I would be delighted. I'm eager to contribute in terms of testing and implementing as well

daylanKifky

Elediko
No, here's the schematic.

ShiroSaki

macio787 https://github.com/ShigemoriHakura/Neko3D_IMU_Module/blob/main/Hardware/Gerber/Gerber_Mini%20K-Ceptor%20R3.zip
I have uploaded the pcb file.
https://oshwhub.com/Hakura/mini-k-ceptor-r3

daylanKifky

Great! we will wrap up the last details and publish it as soon as possible

ShiroSaki

daylanKifky Is the software for kceptor with sensor ICM20948 available now? I only have ICM20948 now.

macio787

ShiroSaki Thanks a bunch! I ordered pcb right away, I have some concerns about BOM, though. The resistors you called 10K, 5K6, 102K and 976K (which are resistancies in kΩ I suppose) are all linked to one part, BOURNS CR1206-FX-1203ELF which is 120kΩ. I'm sorry if it's a dumb question but do I really should use one part for all these? It's the same with 10uF and 2.2uF capacitors.

ShiroSaki

😀 😀

ShiroSaki

macio787 Sorry for the confusion. I forgot to modify the part number. Use the value which is the name of the parts.
PS: RLT and RLB should be the values in this table:
https://wiki.chordata.cc/wiki/ID_Module

Zoe_Caleb

awesome