H-Bridge Controller Using Raspberry Pi Pico

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Solar Mike

Joined: 08/02/2015
Location: New Zealand
Posts: 963
Posted: 05:41am 10 Oct 2021      

  scruss said   ...In addition, the ADC isn't as clever as they hoped it would be. There are workarounds in later bootroms (and I hope/assume in the SDK). More details: ADC ENOB (large PDF link, sorry)

Interesting they publish specs using an external low noise voltage reference, BUT the board as sold doesn't have this, it uses the noisy switch mode 3.3V supply rail. No wonder the module is so cheap.

First thing I did was fit the LM4040 3V reference IC for the ADC reference, will see how that goes.