[Answered] What are the ADC input ranges?

[mnemonix]

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

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

[sandeeptara]

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

[vseven]

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?

[vseven]

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

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

[ParthRathod]

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.

[vseven]

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.

[urbanze]

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?

[vseven]

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