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A new version of the Logizz Pen was soldered today.
The difference between this a the former is both insignificant and significant. There where small changes to the analog front-end, but I have changed the MCU from PIC18 to Rp2040. Mostly because of development tools and libraries available, but also due to the fact that the RP2040 is a) cheap b) fast and c) the PIO are useful in this application.