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What is the vernacular to describe an rf transmitter w/rotary knob that turns a servo/motor 1:1? Answered

I'm barely schooled in robotics and RC.  Seems I'm searching for a needle in a haystack without the precise terminology. 

I'd like to turn a knob on a remote chassis.  The knob presently turns manually from stop to stop approximately six times.  It meters L/min of air.  Low torque equivalent to about average for volume/bass/treble controls on a stereo.

I'd like to be enabled to turn this knob at an indexible 1:1 ratio with a handheld remote transmitter that utilizes a likewise rotary knob. 
Once the servo/stepper or other is mounted axially to the chassis mounted knob and powered by a wall transformer, the hand held remote need not be indexed to match it precisely.   1/4 ID hose attaches to the unit and a L/min flow meter is attached to the remote. 

Rf would be highly desirable.  If necessary, or practical, I'd go with a wired rotary encoder/controller to accomplish the same.  I'm unable to find either option after a day of searching online. 

Fully willing to cannibalize existing products as well.  It's sometimes much easier and cheaper way to go.

Thanks

Discussions

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PeterM13

4 years ago

Try an Old fashioned antenna rotor Maybe over powered but it would work they come in either three or four wire conections and rotate about 359 deg before you need to reverse. They even came with preset stops so you could find your best picture and it would remember the direction (rotation to it)

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rickharris

4 years ago

Your going to have difficulty. A standard RC servo turns abut 270 deg. You can get multi turn ones usually made for sail boats for pulling in lines.

You can modify a servo to turn continuously but then you loose the position feedback to give you precise control.

Your best bet is a custom system, using a microprocessor and a small stepper motor - You can define with the microprocessor the direction of the steppe and how many steps it takes. this should do the job for you.

You may be able to use a small stepper from an old floppy disc drive or similar. I leave it to you to research the necessary how to do it. There is a lot of info on the web and in Instructables on driving stepper motors.

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steveastrouk

4 years ago

Sounds just like a model car remote control.