Here is the problem:
I need to measure the speed of a truck and it need to be simple and cheap.

Range: 0 to 10 miles/h

My solution: Use a laser pointer and a photo detector, the weel will
interrupt
the laser. A PIC measure the time of the interruption, I know the size of
the
weel, the PIC calculate the speed and show on a 2 digit display.

My question:Can the laser pointer be on 24h/day? Any suggestions?

Regards,

Octavio
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Octavio Nogueira - nogueira@mandic.com.br ICQ# 19841898
>From the creator of ProPic,   ProPic 2  now much better
*        http://members.tripod.com/ProPic             *
* PIC Programmer for Windows with down to earth price *
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