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

rodmcm
Posts: 47
Joined: Sat Sep 02, 2017 3:31 am

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

Postby rodmcm » Thu Oct 24, 2019 3:35 am

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
Posts: 3
Joined: Tue Jul 30, 2019 5:05 pm

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

Postby Bwanna » Mon Dec 09, 2019 1:48 am

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
Posts: 3
Joined: Tue Jul 30, 2019 5:05 pm

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

Postby Bwanna » Tue Dec 17, 2019 1:40 am

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
Posts: 4
Joined: Thu Jul 04, 2019 2:12 pm

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

Postby ramon82 » Wed Mar 18, 2020 6:43 pm

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.

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