Arduino to Arduino communication thru USB now working

A project log for Arduino Enigma Machine Simulator

An Enigma Machine Simulator was created with an Arduino UNO and a Touchscreen LCD. Simulates Enigma I, M3, M4, the Plugboard and Uhr Switch.

Arduino EnigmaArduino Enigma 07/30/2017 at 16:360 Comments

Found the Gravitech USBHOST add-on for Arduino Nano:

Figured out how to make it work and now an Arduino Nano can now talk to an Arduino Uno thru USB

Demo below shows a text being entered in the enigma simulator, it uses Serial.print to send it through USB, the Arduino nano receives it thru SPI using the USB Host shield and flashes the morse code of the encrypted letter.