Just a design idea.
You can get 3 of these out of a 100x100mm board.
Not recommended for the W versions as the antenna is a bit close to other stuff. However, it should work with any other pin-compatible Pico clone, including the YD-RP2040 as pins 39 and 40 can be linked. This should also allow it to work with a USB hub. I don't think I'd like to use HDMI with it but it might work.

The RTC is the tiny self-contained module that plugs onto the end if you want it. My usual idea, that you can fit an external battery when the little yellow one dies.

JST 2 connector for a backup battery.
QWIIC (if you ever use them - I never have). Depends on the RTC for pullups.
WS2812 on the not much use GP22, however you can break a solder blob link to disconnect it and run a wire link from a pad to TP5 to run it from GP25 so that it doesn't use any pins. Obviously, it's not supported by Heartbeat so that has to be disabled.

GP0-GP3 used for SD card
GP20 & GP21 used for I2C
GP22 used for WS2812 (but see above)
You get all the rest. :)

You just can't stop playing with SL6  

I'm the same. Really want to start using EasyEDA but this thing is sooo therapeutic.

What is SL6 and is it free?

Most of the time I am using easyEDA - I really like it.

Greetings
Daniel
Edited 2025-06-18 23:43 by Amnesie

Sprint Layout 6

For direct laying-out PCBs. Once you get the hang of it, you're hooked.  

I have the plug-in for curved traces and teardrop pads:

No, SL6 isn't free, unfortunately. If you want something free get EasyEDA. It's a much  more capable package for PCB design. However, SL6 can be used to design a lot more than PCBs. It's more of a 2D CAD package in some ways. It's dead easy to create your own "macros", like blocks.