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GPIO stands for General Purpose Input Output and can be used to receive and send digital signals to and from simple electronics from the Raspberry Pi.

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What's the smartest way to send data from my pi to my PC?

If you only need to transmit from the Pi to the PC and don't need to receive anything back, you don't need to use the Pi's RX pin. Just connect the appropriate pins of that adapter to the Pi's TX and …
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