Seesaw is an open source microcontroller friend for other chips. It provides a variety of capabilities such as UART, ADC, DAC, extra GPIO, etc. to chips that don’t have them. We’ve used the SAMD09 for seesaw for years, and it’s been great. But now we can’t find any SAMD09 on the market for a year or two – so it’s time to redesign! We’re going with the ATtiny817 and megaTinyCore https://github.com/SpenceKonde/megaTinyCore with great success so far! – video.
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