Better ADC i/o accuracy ESP32 boards?

[flaming_crossbow]

Hello,
I am a fanatic ESP32 mini user (MH ET LIVE or Wemos/Geekcreit D1 mini/WEMOS TTGO Mini D1 ESP32) because of its compact size.

But i am experiencing major issues with the huge tolerances on the ADC's accuracy. Analog sensor measurements are way too inaccurate for serious measurements. At 1.5 V the ADC input can register from 1.3 tot 1.6volt. This is a huge problem for temperature sensing etc etc.

Are there higher grade boards out there with the ESP32 chips that measure analog voltage very accurately ?

[mikronauts]

Just use external adc.

Better esp32 adc will need a new esp32 version.

[flaming_crossbow]

Do you mean that it is a chip problem and not a pcb problem?

[mikronauts]

unfortunately yes.

Do you mean that it is a chip problem and not a pcb problem?

[jgustavoam]

Hi,
My project is not compact, but very accurate and stable.
In fact, it uses one external DVM.

https://www.elektormagazine.com/labs/es ... -voltmeter