I have an iOS app that connects to a bluetooth device. Part of the functionality of the app is that it can turn off the device. I want to be able to indicate the on/off state within the app with clear iconography (and no text).
Currently, the best options I have been able to come up with are:
- Display a power symbol that is grey when the device is on and a solid colour when the device is off (this seems really confusing).
- Display a crescent moon shape (similar to iOS' Do Not Disturb icon in Control Centre), however, we specifically refer to it as turning the device off (not putting it to sleep or something similar).
- Display the word "OFF" this is grey when the device is on and a solid colour when the device is off (seems to suffer from a similar problem to option #1).
Is there a better way to communicate this information with only an icon? I think much of my confusion comes from the fact that we're inverting the state (e.g. the icon is 'ON' when the device is 'OFF'). How can I make this more clear to our users?
EDIT: Users will not be able to interact with this icon in any way, it is purely to communicate the state.