Meant to be used with Ai-Thinker ESP32-CAM Module. For easy programming, you can temporarily attach the ESP32-CAM-MB USB Module at the bottom. The case also allows usage of the SD card slot, the flash LED, and an external antenna. The ft-compatible I2C slot is optional, I connected it directly to pins 26 (sda) and 27 (scl) of the ESP32-S module, i.e. the I2C bus the module itself uses to access the camera's control interface at 0x30 . If you don't plan on using the SD-card, you could also use two of the pins 12-15 at the left of the module. Feel free to comment if you need further details on wiring or materials.