Hackolog
seperator seperator seperator seperator seperator seperator seperator seperator seperator seperator seperator seperator

It is always fun to print some text or drawings onto a spherical object. And it was easier to build this time as the new Lego Mindstorms NXT motors are easy to control.

Lego Made Globe Plotters

The robot can draw the world from a white ball using zigzag lines to label the continents as well as the oceans. Two motors were being used for tilting and rotating the ball while the third motor has a dual function such as to select the desired color to use with and it lifts the pen when not in use.

There is a touch sensor attached on the frame to detect the initial position of the three felt tip pens.