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'[EE]:Tilt sensor - Other ideas?'
2002\05\21@015754 by Pang

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Hi all,

I think these ideas on using a potentiometer are great! But I am still
thinking of the mechanical part, how do I reliably hang/slot a heavy thing
on the arm of a potentiometer/quadrature encoders? Any ideas?

I have just found out that the cost of the Accelerometer-ADXL202AE is
unbelievably high at USD 18 while the cost of a Electolytic Tilt Sensor is
also high at USD 4 -> 5. In addition, when I think of real life application,
the sensor will Not be able to raise an alarm if the car is jack up
simultaneously from the front and back. So this is another disadvantage.

From there, a fren of mine suggested using Ultrasonic sensor to detect the
distance between the car and ground underneath. I think this is possible
too, but again, ultrasonic sensor is not cheap either. Maybe someone could
suggest me one which is sufficiently good and economical.

Or maybe, like Jinx suggested, use infra-red sensors to detect the
tyre/suspension movement? But, will that be reliable on broad daylight? Or
pets that sleep underneath at night?

Any other ideas to raise the alarm whenever a car is being towed?

Have a nice day.

Rgds,
Pang


{Original Message removed}

2002\05\21@021226 by Jafta

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When you park, register the position of the car with a GPS module.
When the vehicle moves more than x or y  meter without the GPS being
disabled, it sends a message to your mobile phone.

GPS modules and GSM modems are quite cheap, as reported on this list.
This way you also know where your vehicle is going to if it sends an
SMS every few minutes after detecting illegal movement.

Regards

Chris A

{Original Message removed}

2002\05\21@025843 by Pic Dude

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"... how do I reliably hang/slot a heavy thing
on the arm of a potentiometer/quadrature encoders? Any ideas?"

How about getting a small strip of metal and wrapping it around
the arm of the potentiometer.  Take advantage of the flat-spot
on the pot to keep it from slipping.  On the other end would be
the weight which could be as simple as sticking on one of those
stick-on wheel weights.  You could also add screws/rivets to
better secure it.


"In addition, when I think of real life application, the sensor will
Not be able to raise an alarm if the car is jack up simultaneously
from the front and back. So this is another disadvantage"

True, but if they put that much effort into stealing the car, with
2 tow-vehicles that will be lifted at the same rate, then I say
they deserve it.  Ingenuity and effort like that should not go
unrewarded. :-) :-) :-)
Seriously though, you should be able to use infrared for the
distance measuring, sort of like the automatic taps.  You
could measure suspension travel with resistors on the springs,
and actually not have them interfere with normal operation.
Hmmm... if you did that, you could also measure the tilt.  But
then they can also lift by the wheels and make this ineffective.
I think a vibration sensor here could also help.  How about
a GPS? Any movement with the alarm set would mean the car is
not where it should be, and you can build a GPS map system out
of it too.

Cheers,
-Neil.

{Original Message removed}

2002\05\21@043559 by Alan B. Pearce

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>I have just found out that the cost of the Accelerometer-ADXL202AE is
>unbelievably high at USD 18 while the cost of a Electolytic Tilt Sensor is
>also high at USD 4 -> 5. In addition, when I think of real life
application,
>the sensor will Not be able to raise an alarm if the car is jack up
>simultaneously from the front and back. So this is another disadvantage.

Log on to the Analog Devices web site and get them to send you a couple of
samples free.

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2002\05\21@043822 by Alan B. Pearce

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>"In addition, when I think of real life application, the sensor will
>Not be able to raise an alarm if the car is jack up simultaneously
>from the front and back. So this is another disadvantage"
>
>True, but if they put that much effort into stealing the car, with
>2 tow-vehicles that will be lifted at the same rate, then I say
>they deserve it.  Ingenuity and effort like that should not go
>unrewarded. :-) :-) :-)

This is exactly how they remove vehicles from the streets of London which
are illegally parked. They have a flat bed truck with a device like a
container crane that lifts the car up onto the deck. They are well rewarded
for it - the parking fines come to more than the value of many older cars,
especially if you don't get the vehicle out real quick :)

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2002\05\21@143059 by Peter L. Peres

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On Tue, 21 May 2002, Alan B. Pearce wrote:

>This is exactly how they remove vehicles from the streets of London which
>are illegally parked. They have a flat bed truck with a device like a
>container crane that lifts the car up onto the deck. They are well rewarded
>for it - the parking fines come to more than the value of many older cars,
>especially if you don't get the vehicle out real quick :)

I guess the only thing that would help then is a radar altimeter under the
car body (radar to go through gunk and snow and such). Maybe a dooropener
type radar could be adapted. After all liftinng the car causes doppler
too. But relying on the inverse square law would be better at the few cm
of distance.

Hehe. I like my idea. I will check out a simple 2.4GHz osciallator and
metering detector to see what gives by weekend.

Peter

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2002\05\21@143113 by Peter L. Peres

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>other ideas

Well, you could use a fake 'grounding strip' that touches the ground and a
simple switch. Two of these, one under the front axle, one under the rear,
and that's it. Of course pets, snowploughs, and unfortunate parking
conditions (hole) will catch this. You could also use four metal proximity
sensors in the four wheel suspension limiters (the items that prevent the
suspension from extending too far when the car is lifted). These should be
fairly hard to fool but I'd hate to have to install them.

Peter

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