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Daisy Chain

Connecting the output from one chip to the input of another chip of the same species, multiplies your possibilities!
Think of it like a shift register for Pulse Width Modulation (PWM)....
4 Daisy chained CD4021 shift registers gives us 32 inputs....
Connect shift registers together to get more output and input pins from your microcontroller....
Keyboard kit using CD4021 shift registers and big through hole buttons....
Display 4 digits using only 3 MCU wires with the 4 x 7 Segment LED and shift register breakout board....
32 buttons for a fully-functioning hand-held USB keyboard....
Build your own clock with the MCP79410 chip and 4 7-Segment LED modules....
A QWERTY keyboard you build yourself....
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