Circuit for Hall Effect Position Sensor

[Adam60]

Hey all. Looking for a couple of things regarding a hall effect sensor as a position sensor. First of all, does anybody have a clear description, tutorial, video on how a hall effect switch acts as a position sensor? Secondly, I want to demonstrate how an automotive throttle position sensor is used to provide the ECM position information using a circuit that can be built relatively easy. Any ideas?
Please do not confuse this with a camshaft/crankshaft position sensor. I am looking for a way to demonstrate how it replaces a potentiometer as a position sensor.

[voltsandjolts]

Formula student?
Penny and Giles are the bees knees for that kind of thing, eg. their TPS280 throttle position sensor:

http://www.cw-industrialgroup.com/Products/Sensors/Rotary-Hall-Effect-Position-Sensors/Contactless-Throttle-Position-Sensor-Dual-TPS280DP.aspx

http://www.cw-industrialgroup.com/Products/Sensors/Rotary-Hall-Effect-Position-Sensors.aspx

Have a browse on their site you might find what you seek.

[Adam60]

That was bang on the money. We use a WM830 in our highway trucks and that is what I am looking for.
Now I just need a laymans way of explaining how Hall Effect works as a position sensor and build a small demonstration of it actually working. Any thoughts?