What a cutie pie! Or is it... a QT Py? This diminutive dev board comes with our favorite li'l chip, the SAMD21 (as made famous in our GEMMA M0 and Trinket M0 boards).
The pinout and shape is Seeed Xiao compatible, with castellated pads so you can solder it flat to a PCB. In addition to the QT connector, we also added an RGB NeoPixel (with controllable power pin to allow for ultra-low-power usage), and a reset button (great for restarting your program, or entering the bootloader).
Runs Arduino like a dream, and can be used for basic CircuitPython projects. For more advanced usage like datalogging or file storage, solder an SOIC SPI flash chip onto the bottom pads.
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