computing mph for a weatherstation with opto (anemeter)

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hi
i'm looking on information on how compute miles per hour round disc has 32 shaded area or slots using photo transistor , led. i'm planning on using external interrupt on arduino detect shaded area on disc.
say count how many pulses have been count in 1 second.
don

if diameter of anemometer d , rotates @ r revs per minute, wind speed is:
s = r*d*pi/60
if d specified in inches s in inches per second have convert miles per hour.

pete


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > computing mph for a weatherstation with opto (anemeter)


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