Make your own sensor and adapter cable

You can make your own sensor and adapter cable for the PalmPilot. What you need is an alarm sensor, a 2 wire cable and a female DB25 (RS232) connector. Connect the sensor to the PalmPilot using a Modem Cable. The Alarm sensor is a magnetic type normally used for windows. Use a Normally Connected (NC) Type.
This is how to connect the pins for the connecter cable
when using an Alarm Sensor Device 
.                        Female DB25 Connector
.        PalmPilot       Connect to Pin 3 and 4       Alarm Detector 
.   __   Modem Cable   I-\  I-\                         /-\ /-\
.  I  I                I I  IO--------------------------IOI I I
.  I  I================I I  IO--------------------------IOI I I
.  I__I                I I  I I                         \-/ \-/
.                      I-/  I-/                     
.------------------------------------------------------------------------
.
.    Connect this Female DB-25 Connecter
.    to the Pilot Modem Cable
.
.  The Female DB-25 Connector 
./---------------------------\
.\ o o o o o o o o o O O o o / <- Pin 3 and 4 
. \ o o o o o o o o o|o|o o / 
.  \-----------------|-|---/
.                    / |
.                   /  |
.                  /   |
.                 /    |
.                /     |
.             /--|-----|--\ 
.             |  O     O  |  <- Alarm Sensor 
.             \-----------/
.             /-----------\ 
.             | O       O |
.             \-----------/
.
.
And if you choose to use a hotsync cable, Then connect pin 3 and 8 to a Male DB9 connector. 
.  
.
. /-----------\
. \ o o O o o / <- Pin 3
.  \ o O| o o / ><- Pin 8
.   \--||---/
.      /\
.     /  \
.    /    \
.    |     |
. /--|-----|--\ 
. |  O     O  |  - Alarm Sensor 
. \-----------/
. /-----------\ 
. | O       O |
. \-----------/
.
.
>
----------------------------------------------------------------------

How to connect the pins for the connector cable when using
a Pilot Hotsync Cable (or the standard Cradle) and a CatEye Mity-2 Sensor

You will need a Male DB-9 Connector and a small printed circuit board
or something else that  will fit in the CatEye computer holder. 
-------------------------------------------------------
. DB-9 Male Connector
.
. /-----------\
. \ o o O o o / <- Pin 3
.  \ o O| o o / ><- Pin 8
.   \--||---/
.      /\
.     /  \
.    /    \
.    |     \
. /--|-----|--\ ><- Place this where you normally have the Cateye Mity-2
. |  O     O  |
. |Experimental
. | Printed   |
. | Circuit   |
. | Board     |
. \-----------/
.
.
>
How to connect the pins for the connecter cable
when using a Pilot Modem Cable and a CatEye Mity-2 Sensor 
. Connect this Female DB-25 Connecter
. to the Pilot Modem Cable
./---------------------------\
.\ o o o o o o o o o O O o o / <- Pin 3 and 4
. \ o o o o o o o o o|o|o o /
.  \-----------------|-|---/
.                    / |
.                   /  |
.                  /   |
.                 /    |
.                /     |
.             /--|-----|--\ ><- Place this where you normally have the Cateye Mity-2
.             |  O     O  |
.             |Experimental
.             |  Printed  |
.             |  Circuit  |
.             |  Board    |
.             \-----------/
.
.
>

Other Sensors

The Cateye Mity 2 Sensor works quite simple, it's like a switch that closes every time the magnet passes the sensor, so any sensor that works like a switch should work. I now use the simple burglar alarm switch, it works fine.
I have also connected a Sigma RCS Wireless to the Pilot. And it works using the same connections as above. But my experiences with the Wireless was not so good, it seemed that I had problems adjusting the sensor. I lost contact several times, maybe someone else has better experiences with Sigmas.
But please be careful. Don't experiment unless you know what you are doing...

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