Lots of magic can be handled by micro-controllers.  When you want to invest the time search the web for: Arduino, ZBasic, BasicX, Picaxe, Stamp, Atmel, AVR, etc, etc.  Here is my example: my elevator trim motor operates at regular speed when I am flying at low airspeed, such as the pattern for landing.  However, with a micro interfaced it senses airspeed and uses PWM to reduce the RPMs of the pitch trim motor while I am at cruise speeds to allow me to finely adjust the trim.

Terry Adams
KSCK

On 5/23/2011 6:33 PM, Marc Wiese wrote:

Does anyone know of a sensor that determines position, feeds back a signal
to both allow position and preselection of motion? I am trying to fabricate
a flap handle that when put in a position (say 30 deg flaps) actuates the
motor; the sensor senses when the motor (flap) is there and then shuts off.
It is ready to reactivate to next position at any time.
Seems to me cowl flap linear actuators (old sat antenna position motors)
might do that? But I already have a flap motor and a way to sense flap
position (at the motor). I just need to feed position back and control it at
the flap handle.
Marc


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