----- Original Message ----- 
From: "James Newtons Massmind" <jamesnewton@massmind.org>

> Does anyone have a schematic for connecting a hall effect sensor to a
PIC in
> such a way that the reading is available as an analog value? All I can
find
> are go/no-go sort of interfaces where the sensor is being used to
count
> pulses.

What you are looking for is a *linear* hall sensor.  They give a
proportionate output voltage (usually 1/2 Vcc when no field is present)
The voltage will rise (a predictable amount based on field strength)
when one pole of a magnet is brought near it, and it will drop when the
other pole is presented.

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