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?

  • 1
    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

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.