/products/raspberry-pi/raspberrypi_projects/b/blog/posts/animated_5f00_grim-blog-6---wiring-diagram-and-the-skullThe skull is controlled by three servo's giving it three degree's of freedom, it also has Led's in the eyes to add a dramatic effect [see the later blogs] Degree's of freedom:>Up/down>Pan [side to side]>Head Tilt www.youtube.com/wa...en-USTelligent Community 12