Hello,
How about adding a simple widget that allows choosing from one of several icons? The smart band will simply log the time and choice, and sync the log to the mobile app, and from there to habit tracker apps like "coach.me", etc. This will allow users to easily track their good and bad habits and correlate them with other data, such as time of day, stress, energy level, etc.
Tell me what you think...
Many thanks,
Oren