Well, since I don't think a final year project must be simple or easy to understand, I suggest one of these:
- analog oscilloscope
- home theater lighting control panel, wireless
- engine control unit for 8 cylinder gasoline engine
- a device to measure the volume of a container, tank or room
- a precision speedometer that requires only simple mounting to a vehicle and no external sensors
- a device that you place a book into and it reads the book to you in a human voice, for use by blind people
- a cat location system, to help people find where their pets are hiding