Let's Make Robots!

motors vs. servos

Im learning as I go here, and recently learned in another thread that motors and servos are very different in that servos can be driven directly from the board while motors require an H bridge or similar to protect the board.

When designing a beginner robot, what are some other differences between motors and servos that may not be obvious to a newbie?

 

thanks

flexinol/nitinol/muscle fiber

I am interested in designing some add on components for my robot using memory alloy wire.

I've never used it before, and thought I'd ask for general advice/pitfalls before I order.

I am planning on ordering it from here

 

http://www.robotshop.com/flexinol-en.html

 

any advice on ordering and using this material?  thanks.

low current motors for very lightweight robot design

Hi all.

Has anybody encountered any VERY small motors that can be controlled directly from an arduino without an H-Bridge, motor shield, or similar?

I think the max current on a pin is 40-50 mA (please correct me if I'm wrong)

I know some small pager motors draw that or less, but was wondering if there was something a little bigger that the robot community uses for small robot projects.

 

thanks

cheap sources for mini-motors?

I'm putting together a project for school kids, so I need to find a volume source for both small dc motors and servo motors.

Like this one:

http://www.browndoggadgets.com/store/motors/mini-motor/

and the ones found in lumi's ALF project

http://letsmakerobots.com/node/33449