Computer keyboard line to mobile phone charging line can change the keyboard round plug into a usb plug can be.
The four lines of the keyboard cable are 5v power supply, clock, data cable, ground cable; The power cord must be red, you can find a polar capacitor on the printed board of the keyboard, and the positive terminal of the capacitor is the power supply; The ground wire is connected with the negative electrode of the capacitor, and the pin of the side painted with \"-\" above the capacitor is the negative electrode of the capacitor; The definition of the keyboard to connect the computer plug, according to the wiring relationship to connect the power and ground, the clock and data line, connect the computer after the connection, if not, the two lines can be reversed.