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.
Liliana Publicado en January 20, 2021
Some chips with extended IO ports can be used.
Elena Publicado en January 20, 2021
Use of expansion port IC.
Andres Publicado en January 20, 2021
Can expand the IO port, or choose other packages
Or add a CPLD
