bingo.. console setting... made usb/jtag the primary
now i got useful message, the usual stack overflow in a task

thanks for your help!

code that was working just fine in ESP32-WROOM
is not working 100% correctly in ESP32-S3-WROOM

IDF 4.4
logging via USB/JTAG

randomly get a restart:

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0xc (RTC_SW_CPU_RST),boot:0xa (SPI_FAST_FLASH_BOOT)
Saved PC:0x40375b28
0x40375b28: esp_restart_noos ...

I have a desingn that 12v is connected through a voltage divider of 15k and 4.7k, which calculates as 2.86v (and meters out as that)
but as soon as i connect it to GPIO34, voltage drops to 2.1v (it still registers as a high level and the GPIO is on)
but thats a lot of drop!

code does set that GPIO ...

works... and thank you for the QUICK fix!

im using the default DARK theme.. and its suddenly got a WHITE background, and grey text (very hard to read)
i don't remember this being the case... i haven't programmed in a few weeks
but now got a new ESP32 project...

ESP-IDF ext version: 0.4.0
VSCODE 1.49.0 (just updated)
Win 10 x64 2004

2020 ...

still researching...

R12 limits current into ADC so that if there is a turn on off the pins internal diodes (assuming it already has small clamping diodes)
its very low current... course with 150k R11 the current flowing should be tiny

mitch

thanks for all the input... I wasn't aware of the issues with low voltage zeners
would I calculate the voltage divider as 6.8v input?

other thought:
what do you think of the diode clamp?
one of my thoughts was to do this

protection id 1.jpg


for sure i will average the value... what do you ...

Hi all,

I want to measure voltage of a car battery... say between 9v and 16v
with and ADC in the ESP32, can you recommend the input circuit to the pin?
would it be a voltage divider then a Zener to make sure it does not exceed 3.3v?
so like 39k + 10k then a 3.3v zener
or maybe 2 diodes as a ...

Hi all,

Im very new at this... but I got 1 issue... I got esp32 all set up in Visual Source code...
apps build just fine...
but

there is some intelisense issues... I get red squiggles on #defines from the sdk
(using the blink demo)
any one solve this?

thanks
mitch