Circuit Playground 32u4 Tester is pico-ified!
32With many chips finally coming back into stock, we're doing a run of some boards we haven't manufactured in quite a bit! for example this Circuit Playground Classic (https://www.adafruit.com/product/3000), our original Circuit Playground board, is based on the ATmega32u4. since its been a few years we pulled out the tester kit and noticed that only one of the three testers was working. the tester was originally designed to use an Arduino M0 Pro (https://docs.arduino.cc/retired/getting-started-guides/ArduinoM0Pro) which was a SAMD21 board with a second USB serial port for programming & debug. but...that board is discontinued! so we might as well 'pico-ify' it by converting the tester to use our RP2040 Tester Brains (https://github.com/adafruit/RP2040-Based-Tester-Brains-PCB) which is combined with our standalone AVR Programming (https://github.com/adafruit/Adafruit_AVRProg) library to perform all the firmware burning, USB enumeration, and testing.
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