JMJ, yes, using a pi, arduino, PIC, or just about anything would work.

https://www.adafruit.com/products/789 is designed for Arduino.  They also
have a good PDF on RFID in general at
http://www.adafruit.com/datasheets/rfid%20guide.pdf

Life will be easier if you use arduino shields with arduino's and Pi hats
for the Pi's.  Basically the Arduino uses 5V and Pi is 3.3V based logic.
But there are always exceptions in life.

With proper searching you might find a commercial implementation that isn't
to pricy and easier to use/plug&play.

On Tue, Mar 31, 2015 at 6:02 AM, JMJ <[email protected]> wrote:

> On 03/31/2015 12:54 AM, Tilghman Lesher wrote:
>
>> That's also why I suggested that you place two proximity detectors
>> along a single path.  The order in which they activate then indicates
>> ingress or egress.
>>
>
> And since nobody has mentioned using a Raspberry Pi yet... you could make
> a proximity detector out of a Raspberry Pi with a camera and/or a USB
> Bluetooth gadget.
>
> If the work schedule is consistent, you could just schedule the PBX to
> route calls based on the time of day.  Yeah, I know... who has a consistent
> work schedule any more?  heh heh
>
> JMJ
>
>
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-- 
><> ... Jack

"Whatever you do, work at it with all your heart"... Colossians 3:23
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