USB (Universal Serial Bus) is an input-output interface which is much faster than standard serial ports.
There are two kinds of USB connectors:
- "Type A" connectors, which are rectagular in shape and are generally used for devices which consume little bandwidth (like keyboards, mice, and webcams);
- "Type B" connectors, which are square-shaped and are generally used for devices with heavy bandwidth requirements (like external hard drices);
The pins on a USB connector are as follows:
||Power supply +5V (VBUS) 100mA maximum