hello, I want to develop mini robots and seen on websites that use engines Seeedstudio Vibrating Mini. Has anyone ever done this? What they can put wheels?
Thanks for everything.
A greeting Emilio. 
That makes for one incredibly small robot. You would need to remove the mass at the end of the shaft which may not be easy, then create a wheel small enough to fit it, but also lightweight enough so the motor runs efficiently. The geared pager motor is also incredibly small and is sized better so that the robot can use a normal (small) microcontroller. Consider the Miniature Rubber Wheel in either case. You might consider some coin cells to power the system.