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When we run out of I/O lines, our first thought is usually to upgrade to a larger microcontroller

When we run out of I/O lines, our first thought is usually to upgrade to a larger microcontroller, which has 40 I/O lines. Eventually, however, regardless of the microcontroller chosen, we run out of I/O lines. So it?s to our benefit to learn how to expand existing I/O lines. Two mini boards have been designed to serve the purpose:
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Pakistan
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