MCP23017 IC with Arduino. This enables to have more digital GPIO on Arduino or any other uc.

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Links:

MCP23017 Pin Diagram:  https://goo.gl/moQKfh

PORTA as Output : https://goo.gl/Q7tJPN

Blink PORTA Pins : https://goo.gl/8EnL4U

 

PORTA as Input : https://goo.gl/sLDZNq

Datasheet MCP23017 : https://goo.gl/M3UyJ7

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