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Can I upload code to the Teensy 4.1 through the Ethernet port
Can I monitor data through the Teensy 4.1 Ethernet port
Can I synchronize Teensy 4.1s & upload code without needing a serial cable?...

I may have found two solutions for pulling out the SD card IO as well,

This contains a cable made from a 1 sided pcb which one can solder to
https://wiki.tizen.org/SD_MUX#Files
SD Card PCB
"The...

That's reasonable, I pulled both GNDs down from their pads.

I have that sorted for my project. I'm also dealing with low frequency signals. Everything is below 50kHz
(although the code executes...

I appreciate the salesmanship :p
No worries, I always get spares so you'll get that 7th sale.

I'm already getting several dozen PCBs, I can just tack this onto the end of my order & I can do the...

It's a research project. I started with a proof of concept of 12, moved up to 48, and now I'm here.

The teensys have worked great for this. I have the code executing ~2M/s which leaves me ~300...

I already have 3 grounds coming off of the board.

I suppose I should add one so if anyone else uses the design differently they will have a GND available.

Thank you, I had not seen that breakout before.

I also added a cutout for the cap so it will lay flat.

Thank you, I think I have everything I need.
I threw all the dimensions up there because I didn't want to miss something and do it twice.

We have a milling type PCB system at the university I...

Unfortunately that's exactly what I need... I'm then going to chain 6 of these together so I have 288 high speed channels.

Since I only have 7 connections I bumped the connectors down to:
https://www.digikey.com/en/products/detail/hirose-electric-co-ltd/DF23C-10DP-0-5V-91/3977785...

25442

Thanks for that, it's still enough to get me up to 48.

Do you know that because you've used these before? If so, I'm curious how you go to those pins.

25441
better image ^

~$1 for the flex pcb & ~$1 for the connectors for 12 additional IO.

25438

I'm looking at something like this

I am making a PCB to receive the Teensy, and I've thought about pogo pins but I've never used them before. It may be time to try them out.

As for my first option, connectors, The best fit I've...

I need a connector for the QSPI memory I/O

tl;dr

I am working on a project which will require 48 channels of I/O. I have used the teensy 4.0 before and was looking to use the Teensy 4.1 but I...