Given we may not get ATsamd09’s for a year or more, we’re redoing many of our pending designs to use the ATtiny8x7, a modern 8-bit AVR. We’re super familiar with Atmel chips so this feels like old stompin’ grounds. Here’s a breakout for a tiny8x7 with STEMMA QT connectors to make development of new seesaw boards fast and easy. It’s nearly pin-compatible with our SAMD09 breakout https://www.adafruit.com/product/3657 – the pin mapping is from https://github.com/SpenceKonde/megaTinyCore/blob/master/megaavr/extras/ATtiny_x17.md
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those new attiny series can also be programmed with UDPI, Spence Konde did some great reasearch on different ways to flash them. Even a Arduino with a resistor is fine for flashing, so you dont need a jlink.