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Useful way to hook up more buttons...

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planetjay:
Parallel would be MUCH easier than serial.

RandyT:

--- Quote ---Parallel would be MUCH easier than serial.
--- End quote ---


But not as practical.  With a serial connection, you only need to use 1 I/O pin on the microcontroller if you aren't concerned with handshaking or 2-way communication, but a maximum of 4 if you are.

I/O pins on a microcontroller are limited in number, and unless you want to go the matrix or multiplexed route, the more you have available to hook to your controls the better.

RandyT

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