Four wires of the USB cable are:
Black is negative (GND)
Red is the positive pole (VCC), which is the power cord
The green one is the positive terminal of the data line (DATA+)
The white one is the negative pole of the data line (DATA-)
The method of distinguishing the four lines is as follows:
Hold the USB connector, the LOGO of the three-prong Y upwards (that is, toward the sky), your eyes can see the four metal contacts inside the connector, counting from left to right, pin 1 is VCC (that is, connected to 5V) The positive pole of the power supply); Pin 2 is DATA-; Pin 3 is DATA+; Pin 4 is GND (that is, the ground pin).
There are a pair of power cords in the 4 core wires of the USB cable, a pair of signal wires in the form of a twisted pair, and the built-in power supply can make the USB interface provide 5v power for USB peripherals. Each USB port can provide 500mA current for peripheral use. I don’t know if you have carefully observed the port of the USB cable. Careful friends will find that there are four golden fingers inside the port of the USB cable. Two of them are longer. They are responsible for powering the USB devices. It can be called a power cord. The two golden fingers on the inner side are shorter and transmit data, that is to say, these are two data lines.
