If you use a phone or a laptop for the trigger, is it in a secure place? Or, can someone steal your equipment?
Does anyone know of an application that can do this?
Seems like a cool project, possibly a side-business, to put the RaspianOS and the application on a microSD card and sell it for $10 or whatever amount (including the cost of the card). The person would then need to get a Raspberry Pi, battery, and USB cable. The THETA can be powered from the Raspberry Pi from the USB cable. The only problem with this approach is that the rig has no screen interface. The user would need to hook a keyboard, mouse, and monitor to the Raspberry Pi to configure it, then, disconnect it. Either that or ssh into the Raspberry Pi to configure it.