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A lil' history ...
R/C Wireless Aerial Video Camera Panning System using the PIC
microcontroller. The purpose of this system is to allow the user to
accurately position two high torque servos that will smoothly control the
up/down and right/left panning of a video camera mounted on a R/C airplane.
The idea is to use a 2-axis joystick to position the two servos. When the
stick is released, the servo stops and holds its last position. As you
slowly move the stick, the servo slowly starts moving in that direction and as
you increase the stick throw, the speed of the servo increases accordingly.
This proportional velocity control works similarly for both camera axis
controls.