ESP32 Forum

Hello!
Couldn't find the right answer to this anywhere, so lets try here.

I'm trying to get my ESP32 to work powered by battery. I want to use a power supply module which gets power from a 9V battery.
The power supply module gives 5V to the esp32, which should be enough.

Why does the code not start when the ESP32 is powered like that?
I have a project which controls two LEDs from a webserver setup by the ESP32. That works fine if the ESP32 is connected to the computer with USB.

Thank you for your help and I'm sorry if this is a dumb question, fairly new to all of this.

What exactly is this 'power supply module'? In general, 9V batteries can't always deliver the power the ESP32 needs as they tend to have a fairly high internal resistance.

I'm using a Pololu 3.3V, 500mA Step-Down Voltage Regulator D24V5F3 to power my ESP32 board with four AAA batteries. The ESP32 runs with 3.3 volts, the 5 volts coming from USB are regulated.
The batteries and the regulator need to able to handle the spikes when the WLAN is activated.
As asked above: What kind is your "power supply module"?