The ADC SAR is factory calibrated, and a reference value is burned into the eFuses . So, using the analogReadMillivolts value is highly recommended to get accurate values, as it uses the calibration curves for the sensor.
The values will always be at their least accurate at the top and bottom of ...

Dear ESP Technical Support,
I am developing a FireBeetle2 ESP32-C6 Board.
https://www.dfrobot.com/product-2771.html

I tested the ADC on Pin 1 (set up as attachment). The output is far from the allowed 4095 value.
firebeetle bad analog.jpg


Here are the official example codes of Arduino IDE v2.3 ...

I don't know what to say: if you keep GPIO0 low and make EN low and high, the ESP32 should boot into bootloader mode. I'd suggest checking your board schematic to see if the buttons do that.


Yes, my board's manufacturer marks GPIO0 as FLASH. :lol:

Then, I follow the official procedure to ...

Yeah, USB-jtag-serial needs the BPLL running and I imagine running the CPU at 10MHz disables that. You probably can regain control by holding the BOOT button and unplugging/replugging the board (assuming it's powered from USB).


This is the core part of my board. I did remove the battery, press ...

Dear ESP32 Technical Support and Experts,
I own a board built upon ESP32-S3-WROOM-1-N16R8. I can run any application which I want it to as long as I set the CPU frequency equal to or higher than 80MHz.

Yesterday, I tested my board with a bugless sketch and compiled it at 80MHz CPU frequency. As ...