Better Speed Adjustment M-motor

[elx]

I have a Lego Power Functions M-motor with infrared receiver and remote control. For my project, I would need to be able to regulate the engine speed fully continuously for smooth acceleration (and not in 7 fixed steps). How do I achieve this in the simplest possible way? I’m open to all solutions, not necessarily a wireless one.

[cgg199]

The first thing that sprung to my mind is a Continuously Variable Transmission (CVT).

[elx]

Thank you, interesting! Something like this?

http://www.sheepo.es/2011/09/continuously-variable-transmission-cvt.html

[fresko]

Correct me if I'm wrong, but can't you regulate the speed continously with a train regulator?

http://www.bricklink.com/search.asp?q=4548

[cgg199]

Yes, something like that, but much smaller. Nico71 has made one and I honk instructions are available, so have a look on his website. Take a look here. http://www.nico71.fr/trophy-truck-with-continuously-variable-transmission/

[Blakbird]

Correct me if I'm wrong, but can't you regulate the speed continously with a train regulator?

http://www.bricklink.com/search.asp?q=4548

The train regulator works well, but it is not continuously variable. It has 6 forward and 6 reverse speeds.

[BrianZ]

What are you trying to do with it? I built one of these, but it's probably not the simplest possible way. Pulse width modulation is your friend here, if you are going to design a circuit for it.

Brian Z

[Boxerlego]

Check this out I made this awhile back. I used 555 timer to control the speed of rotation.

Edited February 24, 2014 by Boxerlego

[TinkerBrick]

I would use a RC Unit.

[JM1971]

Could get a lego extention cable and put a potentiometer (like a hifi volume control) inbetween, I'm not exactly sure why PF needs 4 wires and which ones to put the potentiometer on.