goebish

I'm having the same issue (ESP32-CAM with Ov2640), I know the module is working fine since I uploaded and used a demo Arduino sketch without any issues. With ESP32_CAMERA_QR: I...

try with Wire.begin(21, 22);

Have you tried to add pull up resistors between SDA3.3V and SCL3.3V ? I'm not sure Wire.begin takes care of that. If that doesn't work, then I don't know, have...

just use any 1k-30k resistors, that should be fine, you need 2

no, between SDA -> 3.3V & SCL -> 3.3V

because i2c lines need to be pulled up https://rheingoldheavy.com/i2c-pull-resistors/ It could be done in software in the i2c lib, but I'm not sure that's the case, just check with pull...

well, just connect a 10k or so resistor between +3.3V and SDA ... same for SCL

yes, just connect this 3.3V line to SDA through a resistor ... same for SCL, don't change anything else

don't worry, you can't get the magic smoke out just by adding pull up resistors ;)

... don't do that, that could damage the esp! resistors are important!