Arduino-based point-of-sales system using receipt printer, LCD, and keyboard
C++ Arduino C
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Arduino-based Point-of-sales system 

I made a point-of-sales system using Arduino, a receipt printer, a 20x4 LCD and a keyboard
 on October 13, 2012. I thought it would be a good exercise for me because I really wanted
 a reason to use the Adafruit receipt printer and I would have an example of an embedded 
 systems project that was complicated enough to require a state machine. I've documented 
 all the hardware and software at:
  Dependencies (libraries used)
  Adafruit Thermal Printer Library
  Adafruit DS1307 Library
  LiquidCrystal Library
  PS2 Keyboard Library
  MemoryFree Library
  Arduino 1.0
  Andrew Ong