The initiative Computação na Escola demonstrated at the fair how to program SCRATCHIE’s car controlled by an arduino via BYOB using simple predefined blocks for driving forward/backwards and turning right or left. Check out this video (http://youtu.be/8z8Ve74d6YI)
Lots of children who visited the science fair have also stopped by to try out programming simple projects using SCRATCH on a large touchscreen monitor.
More information: http://www.computacaonaescola.ufsc.br/?p=142