The USB interface has four copper pins, two long and two short. The two long pins are at the outermost edge of the interface, and the two short pins are at the outermost edge of the interface. middle.
As shown below: #The two long pins are the positive and negative poles of the power supply. They must not be connected reversely, otherwise the USB port will be burned. The two short pins are data cables. If they are connected reversely, the computer will not be able to recognize the USB device. But it will not damage the hardware.
The USB interface is defined as follows:
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