How to measure low capacitances by STM32F0

Thread Starter

DZenkin

Joined Dec 16, 2014
4
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 !
 

MrChips

Joined Oct 2, 2009
30,795
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?
 

Thread Starter

DZenkin

Joined Dec 16, 2014
4
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.
 

ErnieM

Joined Apr 24, 2011
8,377
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?
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 !!!
 

Thread Starter

DZenkin

Joined Dec 16, 2014
4
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.
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.
 
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