ESP32 always entering flash mode

Other Hardware General Electronics
1

Hi,
I have several ESP32-CAMs here, but one of them is always entering flash mode (so I don't have to press the boot/flash button when flashing, but it also always in downloadmode, as showing in the serial monitor).

I wonder if there's a missing resistor (but I didn't find any, just compared two modules).

As fas as I understand, GPIO0 needs a pullup to 3.3V.
But comparing the two modules, GPIO0 has the same resistance to 3.3V as the working one.

What else can cause this issue?

Are free KiCad files available for the ESO32 cam module, so I can see the traces?

2

What is the voltage on the GPIO0s when the ESP32CAMs are powered ?

3

@cysign
GPIO0 is also connected to the camera.
Try unplugging the camera and see what happens.

4

Disconnectiong the camera didn't help (that's what I expected, since I changed the camera modules on my 3 ESP32-CAMs during the last days for one with an bigger angle and the behavior always was the same).

Whilst the module is connected to USB using the ESP32-Cam mainboard, there is 3.289V present on the PCB.

I cannot measure on the ESP-32s itself when it is connected to the mainboard.

Probably I'll solder a wire to the ESP-23s-module later to meassure it :slight_smile:

5

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