A working prototype of a simple communication device for “yes” and “no” answers. Meant for the intellectually or physically disabled, e.g. those with locked in syndrome like Stephen Hawking. A short press of an ergonomic button means “yes”, causing a green LED to light up, and a longer press means “no”, causing a red LED to light up. The threshold timing can be set with a knob and there is real time feedback on a small LCD screen. I explained a bit about the making of process here.