Development ideas:
• Like weather station; one use case for displaying speed & distance on a webpage by measuring speed using accelerator sensor and distance using signal strength.
• One use cases for switching on the light bulb by clicking a button from physical web url page.
Other suggestions:
• One use case when temperature more than dangerous level; call on an emergency number.
• One use cases each for NFC, Arduino, RaspberryPi & Wirepas.
• Use case for opening a deep link in the app e.g. playing a particular song, open a Facebook page in Facebook app or open shopping cart in Amazon app etc.