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A drying rack is designed with 51, which requires two degrees of freedom but the single-chip pins are not enough.

Hardware design
gennaio 20, 2021 by Declan 1350

I designed a drying rack with 51, but it needs two degrees of freedom (front and back and left and right), and two drive modules are needed. After using one, I find that the pins of the single-chip microcomputer are not enough. I would like to ask what can be solved Method.


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Liliana postato su January 20, 2021

Some chips with extended IO ports can be used.

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Elena postato su January 20, 2021

Use of expansion port IC.

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Andres postato su January 20, 2021

Can expand the IO port, or choose other packages

Or add a CPLD

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