First off, I'd like to say my background is definitely more in the realm of software than hardware so I might be a bit of a beginner about certain things..
That being said, I have this idea that would it would be really cool to track an air hockey puck as it moves across the table. I am envisioning in my head a sensor on each corner of the table and then something on the puck. The sensors on the corners would be sending some kind of signal to the puck and then a certain amount of time (based on distance) later, the sensor would receive a signal back and know how far away the puck was from that particular sensor.
The triangulation, recording all the data, etc. I am not as worried about. I am mostly concerned with finding a somewhat affordable solution at this point that is wireless.
I'd welcome any advice for the types of sensors I could integrate or different approaches to solve this problem.