[Answered] What are the ADC input ranges?

mnemonix
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Joined: Mon Jan 23, 2017 11:07 pm

Re: [Answered] What are the ADC input ranges?

Postby mnemonix » Tue Jun 06, 2017 10:26 pm

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

Attached is my LibreOffice Calc-sheet I hope you can use it.
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ADCmsr3.ods
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sandeeptara
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Joined: Sat Feb 11, 2017 4:08 pm

Re: [Question] What are the ADC input ranges?

Postby sandeeptara » Tue Jun 13, 2017 4:05 pm

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

vseven
Posts: 21
Joined: Wed Aug 30, 2017 3:22 am

Re: [Answered] What are the ADC input ranges?

Postby vseven » Wed Aug 30, 2017 3:25 am

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
Posts: 21
Joined: Wed Aug 30, 2017 3:22 am

Re: [Answered] What are the ADC input ranges?

Postby vseven » Wed Sep 06, 2017 4:42 pm

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

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

ParthRathod
Posts: 1
Joined: Tue Dec 05, 2017 6:28 am

Re: [Answered] What are the ADC input ranges?

Postby ParthRathod » Tue Dec 05, 2017 6:48 am

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
Posts: 21
Joined: Wed Aug 30, 2017 3:22 am

Re: [Answered] What are the ADC input ranges?

Postby vseven » Tue Dec 05, 2017 1:34 pm

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.

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urbanze
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Location: Brazil

Re: [Answered] What are the ADC input ranges?

Postby urbanze » Tue Dec 19, 2017 8:18 pm

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
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Joined: Wed Aug 30, 2017 3:22 am

Re: [Answered] What are the ADC input ranges?

Postby vseven » Tue Dec 19, 2017 8:20 pm

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

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