Has anyone noticed that if calling analogRead() in a consecutive way that the value drops by a bit as opposed to just doing a single read?

And is this to be expected?

I am using a Seeeduino XIAO.

  • You need a short delay between analog reads, more about it here: quora.com/…
    – Nino
    Jul 18, 2021 at 15:10
  • @Nino Thank you. That would explain it! (Add it as answer and I mark it as solution.)
    – MeSo2
    Jul 18, 2021 at 15:23

1 Answer 1


You need a short delay between analog reads due to the time it takes to complete a reliable ADC reading. In depth technical explanations can be found here, note that it refers to AVR architecture.

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