(Archive of: http://www.thing-a-day2.com/2008/02/08/day-8-thing-8-place-holder-for-rotation-sensors/ )
Today I made 2 new pieces of things but not the new thing that I had intended as todays thing today. So for now the the y axis that I built for a future drawing machine, and the limit switches that I added to the etcha sketch mechanism will have to do. The etch a sketch mechanism along with 3 of the other robots need rotation sensors. I plan to build them out of the ir emitter detector pairs that all of the check readers have.
