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Parallel to serial converter

Hi all,

I need to connect a 4x4 keypad to arduino with the least amount of pins possible. What can I do ? I thought of using the CD4021B circuit, but it is not available on tinkercad.

Is there any parallel-to-serial converter available ? If not, can it be added ? Or, is there an easy way to implement this type of converter in a easy way, using the already available components?

Thanks in advance.

Best regards,

Pedro

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