Im looking for a clever way to use a BCD switch with only 2 or less I/O pins. Im trying to port some code from a Uno to a ATtiny85 Pin part. I only have 2 I/O pins left over and need a user input of 0-9. Any suggestions?

BCD Multiplexing

Grumpy_Mike April 30, 2012, 6:33pm 5

Digital to Analogue converter.

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