How to measure low capacitances by STM32F0

Discussion in 'Embedded Systems and Microcontrollers' started by DZenkin, Dec 16, 2014.

  1. DZenkin

    Thread Starter New Member

    Dec 16, 2014
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    Hi everyone!
    Recently I've started to describe some of my embedded projects on my blog:
    http://cortexdev.blogspot.com
    Currently I posted some explanation about using Cortex core in measuring low capacitances with practical example on STM32F050 chip . Any suggestions and questions are welcome !
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    You need to specify the range of capacitances and the resolution you hope to measure.
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    You should also specify the range of capacitances and the resolution you hope to measure.
     
    DZenkin and MrChips like this.
  4. MrChips

    Moderator

    Oct 2, 2009
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    Sorry, there is something wrong with my mouse. I repeatedly get three postings and have to manually go back and delete the duplicate posts.

    Shall we say my mouse is chattering or has too much bounce?
     
    ErnieM likes this.
  5. DZenkin

    Thread Starter New Member

    Dec 16, 2014
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    Range of capacitances started from 15-20pF with only one diode and resistor at hardware part.
    Resolution depends on capacitance, from 7-8bit on 20pF delta.
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Dang it, you deleted the duplicate post. Now my reply sense it makes not.

    But I already have two likes on it so I'm leaving it.

    SO THERE !!!
     
  7. DZenkin

    Thread Starter New Member

    Dec 16, 2014
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    This numbers derived from the project that already works and show not more than 2.5% nonlinear deviations.
    However, I really hope that method usable from 5pF, but in that case initial non-linearity vastly rises.
     
    Last edited: Dec 16, 2014
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