ESP32 Forum

Sorry for the late respond, just seen your question today.

Attached is my LibreOffice Calc-sheet I hope you can use it.

I am a newbie - How to read analog using arduino IDE ?

I purchased a NodeMCU ESP32-S to bring in some 0-10v analog inputs. I've converted them down to 0-3.3v but I've found the same issues as in this thread. Below about 0.2v there is nothing, above 3.1v same thing. Between 2.9 - 3.1 I get a lot of noise and bouncing even though the voltage coming in is stable. But beside all that I cannot get a linear line using 12-bit resolution. Has any progress been made on this?

In case anyone following this is interested I did lots of testing:

https://esp32.com/viewtopic.php?f=19&t= ... 739#p13739

Hello,

ESP32 has 12bit of ADC as per datasheet. so it can measure the change of 12mV on ADC line

I am trying to read 65mV on ADC lines.but it still gives 0.
what is the minimum ADC input voltage range on ADC line of ESP32.

ParthRathod wrote:Hello,

ESP32 has 12bit of ADC as per datasheet. so it can measure the change of 12mV on ADC line

I am trying to read 65mV on ADC lines.but it still gives 0.
what is the minimum ADC input voltage range on ADC line of ESP32.

See the post I made right above yours. Its around 100 mv.

What happens if I set a voltage higher than the attenuation setting indicates? For example putting 3v with 0dB (1.1v) will burn the adc?

No, as long as you don't go past the maximum of about 3.3 it will simply read max value above 1.1.