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→13 Pin Description of the Pin Expansion Board Interface
<li><p>f) '''In addition, it should be noted that the MIC on the 13pin expansion board cannot be used on the Orange Pi Zero 3'''</p></li></ol>
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<li><p>When pin 13 is not connected to the expansion board, pins 10, 11, 12 and 13 can be used as ordinary GPIO ports</p></li></ol></li>
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