Concerning ESP32 PICO KIT V4 , powered by USB or battery.
Device works very good, program runs, but after a powering off of the device, the device doesn’t start authomatically after a new power on connection. The only restart way is to use manually the RESET button and the program restart without any problem. Is this only a problem with the ESP32 PICO KITS or does other ESP32 modules have the same problem ? Does anyone know a solution for this problem ?
What do you see in your serial monitor when this happens?
Pete.
Nothing happens, the screen stays blanc. Device is powered with USB connection to the com port !
After pushing the reset button, the device startup and on the screen you have the boot notifications and the program start running.
Interupting the power by disconnecting the USB, the serial monitor stopt notification (is normal, com port is disconnected.
After reconnecting the usb cable, the serial monitor doesn’t react, there is no startup of the device. Even when I close and reopen the serial monitor.
I found a hint on the internet:
https://esp32.com/viewtopic.php?t=5056 // Auto Boot in case off power Down/Up.
But this solution with a resistor between +3.3V and the IO0 pin gives nothing. Only a restart with the reset button gives a good result. Probably it is a typical ESP32 PICO KIT problem, but I don’t know if it happens with another type of ESP32 device.
P.S. The power LED on the ESP32 comes up when the USB is connected.
This proposed solution with a resistor between +3.3V and the IO0 pin gives no result. I have contacted Espressif (ESP32 develloper), for support.
Pete.