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Analog Input Wrong Reading

Posted: Sun May 26, 2019 6:38 am
by MosheAsh
Hi there
lately, I purchased some controlling mini
i have a big problems when i working with the analog pins.....
I connected a current sensor into A0
when I read the Bits from the screw terminal i receive a very different result than the header pin

in the header pin, the readings are correct about 100 bits(from 1023) per the voltage i supplied
in the screw terminal, the reading to the same voltage was about 15 bits (from 1023)
can anyone tell me what i am missing?

Re: Analog Input Wrong Reading

Posted: Mon May 27, 2019 11:45 am
by Lukas
Hello Moshe,

please check our block diagram of the Analog/Digital INPUT here. There are some dividers in the path from the screw terminal.

Best regards,
Lukas

Re: Analog Input Wrong Reading

Posted: Wed May 29, 2019 10:42 am
by MosheAsh
Thanks for your help
is this means that in low voltage inputs the resolution is affected?

Re: Analog Input Wrong Reading

Posted: Wed May 29, 2019 11:37 am
by Lukas
Hello,

this means that value 1023 (100% of the resolution) is:
  • 5V at pinheader
  • 12V at screw terminal when the device is powered from 12V
  • 24V at screw terminal when the device is powered from 24V
Is it clear now?

Lukas