Closed-Loop Control with PF

[DrJB]

When one thinks controls, typically some version of mindstorms is needed.

However, one can still do some basic closed-loop control with just the PF assortment. This is a thought that has been 'intriguing me for some time and I'd like to hear feedback/ideas from others.

Strictly speaking it may be difficult to implement but nonetheless feasible. The idea is to use a powered motor to operate the switch or speed of a controller for another motor. Both the RC and train remotes can be operated 'mechanically' i.e., by some contraptions, not necessarily by operator's hands. Those familiar with hydraulics might think of this as pilot control.

Any thoughts or would it help if I did few schematics?

Edited April 13, 2015 by DrJB

[Saberwing40k]

Mark Bellis actually did something like this, just follow the link: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=241795

He actually knows a lot about automations and mechanisms, maybe he works with that kind of thing?

[Jeroen Ottens]

Sheepo's carlift has a switch that stops the motor automatically when reaching the top or bottom of the travel:

http://www.eurobricks.com/forum/index.php?showtopic=107021