Better ADC i/o accuracy ESP32 boards?

flaming_crossbow
Posts: 2
Joined: Thu Feb 27, 2020 1:17 pm

Better ADC i/o accuracy ESP32 boards?

Postby flaming_crossbow » Thu Feb 27, 2020 1:34 pm

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 ?
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mikronauts
Posts: 22
Joined: Wed Dec 09, 2015 8:11 pm

Re: Better ADC i/o accuracy ESP32 boards?

Postby mikronauts » Thu Feb 27, 2020 3:47 pm

Just use external adc.

Better esp32 adc will need a new esp32 version.

flaming_crossbow
Posts: 2
Joined: Thu Feb 27, 2020 1:17 pm

Re: Better ADC i/o accuracy ESP32 boards?

Postby flaming_crossbow » Thu Feb 27, 2020 8:39 pm

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

mikronauts
Posts: 22
Joined: Wed Dec 09, 2015 8:11 pm

Re: Better ADC i/o accuracy ESP32 boards?

Postby mikronauts » Fri Feb 28, 2020 3:06 pm

unfortunately yes.
flaming_crossbow wrote:
Thu Feb 27, 2020 8:39 pm
Do you mean that it is a chip problem and not a pcb problem?

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jgustavoam
Posts: 87
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Location: Belo Horizonte , Brazil
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Re: Better ADC i/o accuracy ESP32 boards?

Postby jgustavoam » Sat Jun 20, 2020 2:48 am

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
Retired IBM Brasil
Electronic hobbyist since 1976.

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