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How do I expand the number of Arduino I/O's when using the 74HCT165 and 74HCT595? Answered

Thank you for responding.

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http://bildr.org/2011/02/74hc595/

This is what I learned off of. Just underneath the schematics is some Arduino code that you can copy and paste into any sketch. Unfortunitly this code will only extend you Outputs.

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iceng

3 years ago

Imagine you are rolling a bunch of black and white marbles one at a time through a slot.

A minimal two output lines lets you present a high / low on the data line then clock it in and it shows up on the Q0.

Present another high / low on the data line then clock it in and it shows up on the Q0 while the first shifted over to Q1.

A shifted register lets you add 8, 16, - - 64 extra outputs for two Arduino pins because the shift registers can be serialized !

595.bmp