brock craft

The underside of the “turtle” shows the gearing mechanism for transferring the rotations of the independent axles to the sensor wheel. Rather than using an optical encoder - which is basically just too expensive - the sensor wheels pass through the slots of two IR emitter-detector pairs. These TTL logic devices pull up digital pins on the Arduino and this signal is passed to a Processing sketch. The wheels do generate consistent data on the whole, which is what we were aiming for.

I never knew how to mac Mac desktop my jpeg and other image icons appear on the desktop as thumbnails. After a little searching I found out:

In the Finder hit command+J and check the ’show image preview’ box.
Should be a default setting but it’s not!