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Vehicle Sensor
Look for an Inductive Loop Vehicle Sensor. Its basically just a LC multivibrator that uses the inductive variability of a loop of wire on the road. When a vehicle passes over or stops over the loop the frequency of the multivibrator shifts and a microcontroller can sense this...
Nuke me!
Actually, a dye is diffused into the hair root that is reactive to the laser.
I suggest you start at 1 kilowatt @ 3 seconds and work upwards from there. CO2 lasers are best for hair, skin and bone removal. Check eBay. Best of luck!
:)
Just go get the cheap, super-accuracy 32,768 Hz RTC chip from Dallas Semi. It so accurate over time and temperature your shoes will jump off your feet! Take a look.
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