Develop a low power (battery driven) wireless device/sensor.

The Bluetooth Smart SensorTag is designed to shorten the design time for Bluetooth App development from months to hours by allowing App developers to write Apps that enable and use advanced sensors directly from a smartphone without any firmware or embedded software development.

Source: Simplelink SensorTag –

Design and build a wireless timer for students giving talks.  The student tlaking would have an LCD display that counts down the time left in the talk.  A green LED could come on at some time as a warning, followed by a red one (and a buzzer?) closer to the end.

The person moderating the talk would have access to the timer through a web page.

The project is not incredibly difficult, but there is a wide variety of  tasks (hardware/software/networks…) and the system must be robust and low power.