ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?

[rodmcm]

Have a look at this on UTUBE

He provides a polynomial to linearise an analog


G6EJD

Tech Note 069 - Using the ESP32 ADC and some of its more advanced functions

[Bwanna]

I could use help in the specific sketch to measure the VRef on my ESP32. I've seen where it says to use this or that command, but when I paste them into my Arduino sketch, they all fail.

Sorry for being inexperienced, but could really use the help.
Thanks,!!!

[Bwanna]

Yes, I have working sketches for using temp sensors.... the issue is fixing the ESP32 ADC internal problems. While the correction of the non-linearity is one thing, I am disappointed that the ADC lacks consistency even with the corrections applied. Have decided to use an external ADC instead.

[ramon82]

Hi,

I am wondering if the workaround suggested by HelWeb is working ok for some more people.
I am not sure if this workaround is worthy since it is not feasible for production.

Regards, Ramon.