Apparently the new toll road being built in Toronto, Canada uses PIC devices
as the transponders, it will be interesting to see the results.



At 01:05 PM 3/11/97 +0100, you wrote:
>>Hi,
>>
>>Does anyone have any informations about transponder, like the one used
>>in cars to pay toll? Is it possible to do one with PIC?
>>
>>Cheers,
>>
>>Octavio
>
>In Norway we have a system built on the SAW (Surface Acoustic Waves) principle.
>
>The transponders contain a PCB and a single SAW chip.
>The chip contains a pattern that corresponds to a unique serial number.
>
>When a car passes, the system sends out a powerful RF signal
>from an antenna pointed at the car, and the transponder reflects a slightly
>modified signal (modified according to the serial number) that is
>received by the system.
>
>The transponder contains no batteries or other power source.
>
>A database holds information about payments/number of passings etc for each
>serial number.
>
>I don't know how this is done in other countries.
>
>I know of people that pull down the sunscreen, turn on full lights, and steps
>on the loud pedal before passing....
>
>Anyway, I don't think it is possible to use a PIC to a thing like this.
>
>If it was possible, you would have to get hold of someone elses serial number
>and then they would hav to pay for your passings....
>
>Remember, the above applies only to the system commonly used in Norway.
>
>-Oyvind
>
>

Thanks.


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