Daniel entered an Electronic realization of Etch-A-Sketch toy into the Open 7400 Logic Competition:
This project is an electronic realization of the famous Ohio Arts “Etch-A-Sketch” toy, with a twist. Like the original, two rotary knobs are used to move a cursor horizontally and vertically, respectively, but unlike the original, a third knob selects one of 32 different sketch pages. Simple flip-pad animations can therefore be created by twirling the page knob rapidly.
Via the contact form.
This one looks like the best so far. It’s got it all: an original concept, fully realized and working, with impressive functionality, demonstrating and using the richness of the 74XX series. I haven’t seen another entry in the contest that comes close! This should be made into a kit!
Dave