Turbo speed sensor going to use optics instead ?

[Robert W. Hughes]

You might want to check your laser pointer first. Most of these are are
pulsed, apparently to extend battery life. Point it at a wall and shake
it back and forth. If it draws dotted lines, it is pulsed.

Another possibility is the laser from a busted CD player. They are
mounted on a small driver board and operate at near infrared, about
680nm. Check polarites on power to driver board before removing it from
player, a lot of these things use a negative supply voltage. This is not
a problem for something like this, as long as you connect to power with
the proper polarity - negative input to ground, positive input to
voltage in other words.
-- 
Robert W. Hughes (Bob)
BackYard Engineering
29:40.237N, 95:28.726W
Houston, Texas
rwhughe at ev1.net
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