>
>> On May 31, 2008, at 8:49 PM, Dr Skip wrote:
>>
>> The suggestion was to watch for the drop across a series resistor,  
>> different
>> than looking for blips in the supply voltage. Less problematic  
>> perhaps.
>>
>> BETTER IDEA: Since a stop and open door (a safe one) usually  
>> involves putting
>> the car in Park, and doing so passes "Reverse", and passing  
>> Reverse on the gear
>> shift turns on the back-up lights, then tapping the backup light  
>> line will give
>> you a nice pulse at every stop. Speaking state-ly, the only time a  
>> parking
>> event will occur in error would be putting the car in park and  
>> everyone sitting
in the car without opening any door. A rare condition most likely.

Good idea, DS.  What is the easy install method for detecting "park" ?
cc

>
> Cedric Chang wrote:
>> Lights that go on when car door is open are too problematic.
>> Monitoring sound or pressure is too problematic.
>> I recommend looking at some sort of active scanning.
>> 1)  Look along outside of car for door openings.  Maybe mounted to
>> top of front door windows.  Maybe infrared or ultra-sound or web cam.
>> 2)  use webcam and rotating mirror to look at car doors from
>> interior.   Perhaps glue mirrors or targets to doors so that you can
>> see whether the door has opened.
>> 3)  Easy mount wireless sensors at each door which detect door
>> opening.  Wireless can be RF or ultra-sound or infrared.  Sensor
>> consumes little battery power until door opens.  Sensor can be magnet
>> and reed switch.   OR ????
>>
>> cc
>>
>>
>> On May 31, 2008, at 1:10 PM, Dr Skip wrote:
>>
>> You could offer a fuse replacement for the overhead light line that
>> includes a
>> small resistor value and measure the drop, or just measure the
>> voltage across
>> the fuse. There will be small drop in use.
>>
>> If the car auto-locks, you could sample that line too. It will re-
>> lock upon
>> reentry and drive, and will be unlocked to get cargo...
>>
>>
>> M. Adam Davis wrote:
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