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BCD Complement switch project ideas?
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rpetitho:
All I ended up with 12 of these. All are 0-9 BCD complement. Any project ideas?



-Bob
SeoulBigChris:
Back in the early 90s I designed a digital frequency synthesizer add-on to an existing product. The user could dial in frequency using thumbwheel switches almost identical to these.  This system didn't have a computer, and I ended up converting the BCD digits to the binary control word needed by the synthesizer using a series of EEPROMs - one bank to do BCD to decimal, and another to do a reciprocal operation. 

As for projects, how about using them to set a clock? Or build an old-fashioned front panel to a modern ARM embedded board.

-Chris
Yansi:
There are some interesting ICs for binary/BCD conversion, just as this one:

http://www.utm.edu/staff/leeb/DM74185.pdf
shved:
You can use it with 74ls42 or similar BCD chip.
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