Analog Input Wrong Reading

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MosheAsh
Posts: 2
Joined: Sun May 26, 2019 6:29 am

Analog Input Wrong Reading

Post by MosheAsh » Sun May 26, 2019 6:38 am

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?

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Lukas
Posts: 25
Joined: Tue Dec 18, 2018 3:44 pm

Re: Analog Input Wrong Reading

Post by Lukas » Mon May 27, 2019 11:45 am

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

MosheAsh
Posts: 2
Joined: Sun May 26, 2019 6:29 am

Re: Analog Input Wrong Reading

Post by MosheAsh » Wed May 29, 2019 10:42 am

Thanks for your help
is this means that in low voltage inputs the resolution is affected?

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Lukas
Posts: 25
Joined: Tue Dec 18, 2018 3:44 pm

Re: Analog Input Wrong Reading

Post by Lukas » Wed May 29, 2019 11:37 am

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

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