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I'm a bit confused about the Pyboard. Do people buy Pyboards instead of ESP32 in order to support the project, or because they are more featureful, or both? Why does the Pyboard have a CPU in addition to the microcontroller, does the microcontroller only deal with IO?

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Quick search shows the v1.1 at least it's just a microcontroller and a uSD slot. So I'd imagine it's just about support. With all the ESP32 boards out there, sky's the limit on word behavior you could get from flaky hardware.

Ah yes, I read "STM" and immediately figured it was one of those old school very low MHz microcontrollers but apparently those are available with ARM cores too... possibly had 'em confused with AVR/ATmega.

As a habitual STM user professionally,... Yes. Not the highest performance but high enough and good peripherals. The blue pill is a STM.

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