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USB A to C or USB C to C cable
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The USB cable is used for powering the Radxa Zero as well as
data transmission from your host PC to the Zero. Depending on
host PC's USB port, you may need USB A to C(host PC is USB-A)
or USB C to C(host PC is USB-C) cable.
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microSD Card Reader (required for configuration without built-in eMMC)
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For flashing the image into microSD Card.
Optional
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Power supply
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Yes, power supply is optional for Radxa Zero since the power
consumption is so low it can be powered directly from host PC's
USB port.
If you plan to use Zero independently from PC, you can use any 5V
USB power supply with at least 1A output.
If you do power the Zero from host PC's USB port, make sure it is
a USB 3.0 port so it can provide up to 900mA power. Old USB 2.0
port can only provide up to 500mA.
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USB to TTL serial cable
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This is needed if you intend to use serial console.