I am new and tried a few searches but no luck.
I am designing a project that will need to measure the angle of an arm relative to horizontal (can be actual as in level bubble or just relative to the mount)
Think of a window in the ceiling where I want to measure how much it is open. I need it to either be wireless or can be wired into some sort of wireless hub for up to a dozen of these devices. Wireless in this case is probably Bluetooth. Power must be from long life battery.
Do such devices exist?