uint32_t reading = adc1_get_raw(ADC1_CHANNEL_5); uint32_t voltage = esp_adc_cal_raw_to_voltage(reading, adc_chars); Yes, I am using the above, but it is still inaccurate. It brings me only slightly close to what I am actually reading with a voltmeter. My job aim is to get as closed as possible to t...

Here is a link with examples. I'm using pretty much what is advised there.
Using version 4.4.4 myself:
https://docs.espressif.com/projects/esp ... s/adc.html

@johann75 And I politely disagree with you. Esp32 is not 'completely' inaccurate or useless. Now why don't you start by explaining what you would like to achieve and why it doesn't work for you? I've already told you that I don't work with the arduino framework, so I dont have a 'sketch'. If you are...

This is done with the decode_reg_bits function. In it you see a lot of bitwise operations. >> means right shift, moving a binary number a number of bits to the right. & means bitwise AND. With it you can set certain regbits to 0. | means bitwise OR. Which lets you set certain regbits to 1. ~ means N...

@johann75 What is your actual question? You're requiring me to spend time reading your long posts but, it isn't clear what you actually want. So please be more specific. //or did you just want to share your solution to find vref? With the struct member adc_chars.vref and the calibration function tha...

@johann75 Seems you are using the arduino platform and not esp-idf. There's no point in explaining. To use these functions you need all the #includes. Unless you have a very specific question regarding my code, you're better off asking arduino platform questions in the arduino forum. Try to make ver...

Alright. I found a way of getting my vref value and for example the mac address in code. I think there should be a way of using esp_efuse_read_field_blob for the vref too... And probably multiple other ways as well. But I wasn't able to adapt it for the vref register yet... perhaps someone else know...

Hi there,

Anyone know if I can get the value of the reference voltage (vref) burned in efuse through a built in esp-idf function?
I know I can get it "outside of the board" with espefuse.py --port [PORT] adc_info, but I like to use and display the vref value per board. Mostly out of curiosity

MicroController wrote: ↑

Fri Jan 19, 2024 8:19 am

Looks like the IDs can be found in esp_idf.json in the IDF's root directory.

Thank you! Overlooked that. Did check the idf-env.json but not the esp_idf.json for some reason.

Solved my issues for now by rerunning the esp-idf-tools-setup 'using existing ESP-IDF directory' with my old 4.4.4 install. Still would like to know where to find the IdfId to understand how I could setup and use Inialize-Idf.ps1 shortcuts to multiple idf versions myself though, without running the ...