Hall Effect Sensor

[Carter Shore]

Ade wrote:

> So Hall effect sesors don't need a magnet on the 
> thing that is moving? 
> It
> just has to be ferous...

The magnetic field strength at the sensor must vary +
and - relative to the threshold in the sensor. You can
use a fixed magnet biasing a moving ferrous shutter or
wheel. Prototype it first to make sure that the sensor
will trigger. If the magnet is too strong or too weak,
or the components are placed wrong, the field strength
will not vary past the trigger point of the sensor. 


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