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There is various options, from using a bigger chip to implementing IO expander with shift registers or CPLDs.hi,
my project is:
I want a microcontroller with 40 input and 60 output. پروژه الکترونیک میکروکنترلر
the inputs is connect to optocopller and the output is connect to relays.
so what is your idia about increse the port?
for example with mega32 or mega128 or other avr microcontroller.