Thanks for the pictures Miles, always nice to know what the inside of stuff looks like! I am sure they will give all our motor designers here some food for thought.
Maybe you could connect a blue LED that turns on each revolution too!!
I am sure that most people here have a good idea about what hall sensors do.
But just for fun
, here is a very short clip I made showing the operation of a latching type of hall sensor.
[ Edit: hall sensor is Honeywell SS411A ]http://www.youtube.com/watch?v=qr2QtTzuiaw
Sorry etard, ---I didnt have a blue one