Build a countdown timer with hours, minutes, and seconds set via a keypad and shown on an LCD, with an audible alert when time runs out.
An introduction to Bluetooth technology, the origin of its name, and how it works via 2.45GHz radio waves and the device pairing mechanism.
A breakdown of infrared sensors into four main categories by function: motion sensors, obstacle-avoidance sensors, remote-control receivers, and distance-measuring sensors.
An explanation of how GPS navigation works through its satellite network and triangulation principle, the factors affecting its accuracy, and its main practical applications.