consecutive analogRead()

Question

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.

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

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.