>"in my infinite spare time" Can we please make this a thing? I'll even share one: Rig up some arduino's to some sort of Sonar device, and use it to detect bo

>"in my infinite spare time" Can we please make this a thing? I'll even share one: Rig up some arduino's to some sort of Sonar device, and use it to detect boundaries when my eyes are closed. That way I can walk around buildings blindfolded with no cane and freak people out. (And possibly actually use if I ever become blind.)