I need to power my camera peripheral with an external power supply, since apparently I can't power both the camera and the camera's relay switch with my 5V out pin (My relays cut out and continually reset themselves if I try to run my 5V to both the camera relay switch and the relay board VCC.)
So I'm powering the camera with a 5V battery pack and my arduino with my PC, but I still need to communicate with it via UART, so I need the camera ground to be the same as my arduino ground. Can I connect the two? Is this a bad idea? Because I'm doing it now and it seems to work. I just don't want to cause a problem later on down the road, whether I'm connected to my computer or on battery power.Any advice would be greatly appreciated.