Keypads are very handy input devices. And there are many great libraries written to interface to keypads! But who wants to tie up 7 GPIOs, have a handful of pull up resistors, and write firmware that ...
MM74C922N datasheet at http://www.ti.com/lit/ds/symlink/mm54c923.pdf PCF8574 datasheet at http://www.nxp.com/documents/data_sheet/PCF8574.pdf Use this library freely.
The ARDUINO IDE associated with the ARDUINO board uses specific numbering, assigning numbers from 0 to 19 to digital pins 0 to 13 and numbers A0 to A5 to analog pins. GCBasic directly manipulates the ...
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