– Is this kit / board better used with Raspberry Pi 3?
It’s better used with Pi with more computing power. Pi 3 and Pi 4 will all be better than older version and Pi Zero.
– Can this kit /board be used with other cameras? What steps are needed to do this?
This kit supports some other Arducam customized MIPI cameras with clock-sharing hardware tweaks, (a normal working camera won’t do) but usually we would not recommend you using this bundle with other cameras. Because aside of the customized camera requirements, there are also firmware differences between different image sensors and camera counts. So the steps are 1)getting another Arducam customized camera module with clock-sharing tweaks. 2) contact Arducam support Team to see if they can help you with an firmware change.
– What does the USB port on the board do?
Alternative power input to the GPIO pin sockets. So you can plug in another external power supply to the camarray HAT when you don’t use or don’t have access to the GPIO power pins.