[taneq]

There’s your first lesson: Always have a debug header with serial pins on your board. ;) It should be easy enough to solder some wires onto the ESP32’s serial port… although wait, how are you programming it?

It’s also good to have a couple of status LEDs and a power indicator on any custom board. Then you can add blink codes to indicate errors etc.

[stavros]

I programmed it once and then flash OTA, I couldn't add LEDs because they messed skfh fbe photodiode's readings.