Matt Mets @cibomahto@v.st

The built-in calibration project on the Prusa SL1S is neat- it prints a model with 8 different exposure settings simultaneously, allowing you to pick the best one: https://help.prusa3d.com/article/resin-calibration-sl1-sl1s_112182 If I followed their advice for longer expose, this might have worked in the first round

Trying to make a profile for the Prima creator "crystal clear" resin on the SL1S. Prima lists the exposure speed as similar to their "tough" variant, but with 10x the viscosity. For some reason, it seems the exposure time needs to be much longer (>5x apparently).

Got a little help bringing up the CH55x reset boards; they're designed to put a WCH CH55-series processor into bootloader mode automatically, via either a button press or HID request.

Comic Sans, a versatile typeface!

May you have a warm and cosy Caturday

I'd like to see what's happening in the host USB stack to give ~200us turnaround times between control transfers..

Eurocircuits has a neat online DRC setup; in this case, it didn't like my 0.3/0.6 vias, so it autocorrected them to 0.25/0.6.

Nice part: STM's USBDF01W5 includes both ESD diodes and an RC EMI filter in a SOT23 package. Very convenient that it has the same footprint as common ESD-only parts ;-) https://www.st.com/en/protections-and-emi-filters/usbdf.html

Logic 1 does support this, but I'd much rather use 2 these days.

The @saleae Logic 2 software is really nice, but the remote control API didn't have an obvious way to just start a capture using the current settings. Fortunately you can do it yourself by using a GUI automation tool to poke at the right part of its guts: https://gist.github.com/cibomahto/3c47e7b06622aad732cbea4ac11900c4

First board of the year, an automation tool for putting CH55x devices into bootloader mode.

Protip: You can buy new logic analyzer probes to replace your old worn out ones. I recommend replacing them at least every every... 10 years now I guess? https://eur.saleae.com/collections/accessories/products/wire-harness-97

It might be the year of linux on the desktop, but none of the screen capture utilities work so we'll never know 😠

I'll take 'things I didn't care to need to see the inside of' for $100, please.

I was wondering how many solutions there were to this 'scramble squares' cat puzzle my great Aunt gave me, so I wrote a solver for it: https://gist.github.com/cibomahto/31e0ec014bedcd39242265e333535809 . The answer seems to be two unique solutions.

It's always nice to pick up an old project, and find that past you bothered to label things.

I'm attempting to extrapolate radiated emissions from common mode current measurements. Here's a measurement of a USB memory stick when idle, and when transferring data. So far the measurements don't seem to correlate well to known emissions measurements, but maybe it's helpful for troubleshooting noise sources.

Here's a printable plastic stand to hold your RF current probe in a fixed position (why don't the probes come with something like this?): https://www.printables.com/model/307119-cable-support-for-rf-current-probe

Nice to be able to fill a whole print bed. Maybe we need a bigger one though?

Neat: Altium has a realtime trace max current and delay calculator now.