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 !

 

You need to specify the range of capacitances and the resolution you hope to measure.

 

You should also specify the range of capacitances and the resolution you hope to measure.

 

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?

 

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.

 

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 !!!

 

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.