What does mahjong machine usb interface do?

Mahjong machine usb interface is a charging interface.

Mahjong machine USB interface is the interface where your mobile phone is dead when you play mahjong, which is convenient for your mobile phone to charge.

Usb interface

Universal serial bus (USB) is a serial bus standard and a technical specification of input and output interfaces. Widely used in personal computers, mobile devices and other information and communication products, and extended to photographic equipment, digital television (set-top box), game consoles and other related fields.

The latest generation is USB4, with a transmission speed of 40Gbit/s, a three-stage voltage of 5V/ 12V/20V and a maximum power supply of 100W. The new C-type interface allows positive and negative blind insertion.

USB is an external bus standard, which regulates the connection and communication between computers and external devices. USB interface has hot plug function. USB interface can connect various peripherals, such as mouse and keyboard.

USB was jointly launched by companies such as 1996 1994. It has successfully replaced serial port and parallel port and become an essential interface for computers and a large number of intelligent devices.

After years of development, the USB version has now developed to 3. 1 version. For most engineers, the main obstacles to developing USB2.0 interface products are: facing the complex USB2.0 protocol, writing USB device drivers by themselves and being familiar with the programming of single chip microcomputer. This requires not only considerable VC programming experience, but also hardware (firmware) programs that can write USB interfaces.

Refer to the above? Baidu encyclopedia -USB interface