Introduction: Toy Cash Register Hack to Add Real Bar Code Scanner.

Picture of Toy Cash Register Hack to Add Real Bar Code Scanner.

My daughter was disappointed that the scanner in her toy cash register didn't really work.  I solved this by interfacing an old PS/2 CueCat bar code scanner to a PIC and output the data to a serial port in ASCII format.  The original cash register display is accessed by hacking the keypad through a couple of M74HC4051 multiplexers.  The display can be cleared and the first 8 digits of the bar code displayed.   All 8 characters can be reliably written to the display in less than 250 ms.

Comments

Penolopy Bulnick (author)2013-01-15

Sweet! I bet your daughter just loves it :D

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