rather than buying an encoder or servo
decided to make some 3inch discs using sketchup
dividing one disc into 24 sections and other into 64 sections.
using an optical slot sensor, use the 24 slots disc for wind speed and the 64 slot disc for wind direction.
using a compass, point the wind vane to the north to calibrate at time of install or use then allow to move to indicate wind direction.
the 24 section disc for wind speed.
using a scroll saw, cut slits into plastic laminate for discs.
now to order slot sensors and figure out code for pic.
Plan is to use for aiming an air cannon for hitting defined targets at 30, 60 and 90 yards.
PIC w/ LCD display to indicate muzzle velocity, wind direction, wind speed, air chamber pressure as well as projectile energy based on projectile weight and muzzle velocity.
going to leave nothing to chance as cash in being offered.