ESP32 Forum

I purchased the ESP-WROVER-KIT v4.1 from Digikey and can not get the external 32.768 crystal to be accepted when I enable it with menuconfig. The output is always
W (321) clk: 32 kHz XTAL not found, switching to internal 150 kHz oscillator


I've tried deep sleep examples which programatically call out for enabling and calibrating the xtal but they don't work.
I've loaded the lcd example stock and it worked and then changed CONFIG_RTC_CLK_SRC_EXT_CRYS=y and CONFIG_RTC_CLK_CAL_CYCLES=576 and it gave the same 32 kHz XTAL not found... message.

I could not find any examples for the ESP_WROVER_KIT with CONFIG_RTC_CLK_SRC_EXT_CRYS=y

Even the deep_sleep example does not enable the 32.768kHz crystal.

how?

Could you check the module on this board is ECO3 chip or no? If it is ESP32-WROVER-E or ESP32-WROOM-32E, please add a parallel resistor across 32768 crystal.

ESP_LJH wrote: ↑

Wed Feb 01, 2023 11:18 am

Could you check the module on this board is ECO3 chip or no? If it is ESP32-WROVER-E or ESP32-WROOM-32E, please add a parallel resistor across 32768 crystal.

The kit version I have is an ESP32-WROVER-E model. What size resistor goes across the xtal/GPIO32_GPIO33?

I ended up making a OpenWeatherMap weather station out of the Wrover-kit and had been getting NTP updates daily at 00:05 and just missed one because the board lost 6 minutes in 24hours. When it got the OpenWeatherMap data it was still the previous day so the daily forecast and display was all wrong...

Hammering NTP servers hourly just doesn't seem like the right way to go.