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Apparently it's possible to test the capacitance of a capacitor with an arduino. In this thread, someone tries to do the same on a NodeMCU but the conclusion is that it's enough to get the change in capacitantce, not the real value, and it's not "really stable" (reliable?).

I would like to get the real value of the capacitance (not just the change of the capacitance). Is there a way to do it with a NodeMCU Lolin v3?
If yes, how?
If no, will an arduino clone (like Elegoo or Geekcreit) be precise enough to give a real value of the capacitance?

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    An arduino uno has a high current output for a digital output pin and a high impedance analog input. The nodemcu has neither. An arduino uno clone is okay. Try a few examples that you can find. Some are accurate for small capacitance values, such as 100pF. You can start with this good example: gammon.com.au/forum/?id=12075 Please tell us what this is for. If you want to measure the soil moisture with a capacitance meter, then I think this is the wrong way. – Jot Dec 24 '18 at 20:33
  • Thanks for the link, this is a very good example. I just want to be able to test my capacitors, to see if they are working and to get their capacitance value. – MagTun Dec 25 '18 at 16:23
  • And by the way, I have seen this 3€ arduino uno, do you think it will be precise enough for testing capacitors. – MagTun Dec 25 '18 at 16:30
  • Yes, that will work. You need an extra driver for the ch340g usb serial chip. – Jot Dec 25 '18 at 17:20

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