Go Down  Topic: Parallel In Serial Out Diasy Chaining (Read 747
times) previous topic - next topic   So for my engineering
design project, I have to read in 12 buttons using just 4
arduino pins. I know it's possible to do it using 2 Parallel In
Serial Out Registers, but I have no idea how to daisy chain them
together. Can someone help me? Also, how would the code work?
In brief:  Serial out from one chip into serial in of the other,
parallel the other control signals, parallel-load then clock for
twice as many pulses...   Or use a MCP23S17 or a better yet with
only 2 pins a PCF8575.  Go Up