ESP32 Forum

Hello,
anyone is able to make an estimation for ADC2 support? I noticed in the programming guide that actually only ADC1 is supported. A simple time estimation would be nice.

Thank you!
frax

frax84 wrote:Hello,
anyone is able to make an estimation for ADC2 support? I noticed in the programming guide that actually only ADC1 is supported. A simple time estimation would be nice.

Thank you!
frax

you can try this in the meantime, read the notes in the comments.

best wishes
rudi

Wow, thanks for the quick and useful reply!
I'll give it a shot!

frax

Hello again,
i would like to ask an info about the ADC2 support.
From the issue linked by rudi:

ESPrite:
"we're a bit hesitant to make ADC2 available because it is also used for pretty important control loops inside the WiFi (and maybe BT, I don't remember) drivers. We want to make sure there's no chance of these and the user ADC calls to interfere with each other."

For the project i'm working on ADC2 is an important element (i would need a total of 12 ADC channels) and i use BLE to transfer data. I would like to know if ADC2 pins are used for BT control loops or not.

Thanks,
frax

Bump

We are working on implementing this. This is a bit tricky because the arbitration mechanism needs to handle different scenarios (different WiFi throughput, ADC polling frequency) and we want to make sure that we still get reasonable performance in all cases. Will update the corresponding Github issue when we have it working.

Yes, the problem is clear...but i don't need the wifi.
I want to know if there is the same problem with bluetooth.

This is starting to be frustrating
I'm stuck with this until i get an easy answer: are the pins of ADC2 used for BT control loops? Can i use them for ADC2 if i don't use WiFi?

No, ADC2 is not used for BT. If you don't use WiFi (i.e. don't call esp_wifi_init), you should be able to use ADC2.

Awesome!
Thank you
frax