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Clarified the UART cable connections in part3 write-up
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@ -39,7 +39,14 @@ The same cable will work on a Mac without the need to install any drivers.
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Now we need to look at the RPi4 to identify how to connect the other end of the cable. You'll be looking for the **GPIO pins**, all 40 of them, which are just above the Raspberry Pi copyright notice.
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The diagram below shows where you need to make connections. The BLACK connecter hooks over Ground (Pin 6), the WHITE over TXD (GPIO 14/Pin 8) and the GREEN over RXD (GPIO 15/Pin 10). As we are powering the RPi4 using a dedicated power supply, make sure you **don't connect the RED connector**.
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The diagram below shows where you need to make connections. The cable I recommended has breakout leads that are colour-coded as follows:
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* BLACK = Ground
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* RED = +5v Power
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* GREEN = TX (transmits from USB port to RPi4)
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* WHITE = RX (receives to USB port from RPi4)
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The Ground lead (BLACK in my case) hooks over the RPi4's Ground pin (Pin 6), the RX lead (WHITE) over TXD (GPIO 14/Pin 8) and the TX lead (GREEN) over RXD (GPIO 15/Pin 10). Note how it's necessary to cross RX and TX, i.e. connect RX to TX and vice versa. As we are powering the RPi4 using a dedicated power supply, make sure you **don't connect the RED connector**.
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![GPIO location](images/3-helloworld-pinloc.png)
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