Thank you very much lberstone.

I am sorry to say that the output continues to be a noisy signal.
This is such a simple code so I must be overlooking something basic or else there is a faulty hardware, which usually is not the case. Should I fetch the "driver/adc.h" from some specific place? Here is ...

Is there a way to test the Hall sensor for hardware failure? Maybe to connect directly to it?

I have tried the Example Hall sensor but I get only noise (it looks like a disconnected pin). My ESP32-EVB is OK as the other examples work nicely.

Any suggestions would be much appreciated! Thank you ...

I cannot make the Hall sensor example work, the plotter just shows noise and the sensor does not react when I approach the magnet.
The example is as simple as can be. I am using Arduino with the ESP32 extension.

I can get the ESP32-EVB to work with LEDs etc. so I have a serial connection that works ...