Roll-up a door please! (with a State Machine in code, part 1) MHO Junction’s Molson Brewery in a 3D Layout View ( all photos and drawings by Lloyd Henchey, Ontario, Canada) We all know we can open and close close something with an Arduino and a Servo, but what if we want to a little bit more operating fun with some lights and sounds, all after a manager gives approval to open or close the door to the beer brewery before your engine is allowed to pick up or deliver a car? Control Panel at the brewery Six doors under construction at the Molson brewery on the MHO Junction Engine pulls up to the red light, shift manager (operator) grants permission, door raises up with alarms and a flashing red light, door goes all the way up, light turns green , engine or car can proceed! Same flashing red light going down and maybe different door squeaking noises. All good articles start with a YouTube video: youtube.com/watch?v=-8EnpUgTqR4 ! This article will introduce you to a “Finite State Mac