- code example for 4051’s: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1257035971
- datasheet for the 4051 multiplexer: http://www.nxp.com/documents/data_sheet/74HC_HCT4051.pdf
- Sparkfun MUX shield (48 inputs, outputs): http://youtu.be/-h2intYYghk
4051 example:
Another 4051 example with circuit diagram using piezo discs: