The Uhr was an external attachment that plugged to the plugboard and performed different letter substitutions depending on which Uhr setting from 00.39 was selected. The printer function, textured background and the serial port functionality can be enabled and disabled when the machine is opened and ready to set the rotors. There is a printer tape running in between the lamp field and the rotors. In the center section the lamp field is visible and the rotors are at the top.
The plugboard is at the bottom, the keyboard is just above it. On initial power up, it defaults to an Enigma M4, with reflector B thin, Greek wheel Beta, and rotors 1,2,3, set to A, no plugs connected on the plug board. The Arduino Enigma Simulator can be used stand alone with a 9V battery and plug (included), be connected to the computer via a USB cable (also included) to receive power, or it can be operated from the computer using a terminal program. This had the side effect that a letter would never encrypt to itself, a property exploited by the people who broke the enigma code. The reflector was its principal weakness, it made encrypting and decrypting easy, for the same wheel position, if A was encrypted to G, pressing G decrypted it back to A. The lamp stayed lit for as long as the key was pressed, once the key was released, pressing the same key again would move the rotors and another lamp would light. This current is sent back through the rotors by a reflector and then it lights up a lamp in the lamp field representing the encrypted letter. The main parts are the keyboard, which moves the rotors, then applies a current through the rotors. The enigma machine was an electro-mechanical encryption device used around World War II. It can even be powered away from a computer by using a 9V battery and a barrel jack plug. Sure, a phone app is more practical, but this is a physical device can be interacted with, taken places, shown around and be a conversation piece. Once the touch screen shield has been mated to the arduino, it sort of resembles the actual machine. Wouldn't it be something to have an Enigma simulator running in an arduino with a touchscreen. I found an excellent Enigma simulator for the Android platform and this got me thinking.
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