Simple Usb Hub Circuit Diagram. Most low cost usb hub implementations i have seen do not bother to limit the per port current draw. The hub can detect the attachment or detachment of devices in each port of the hub.
Simple usb charger circuit diy. Using an atmega32u4 breakout board. They call it the tusb2046.
Using atmega32u4 in a circuit.
The usb hub is used to connect many devices to the pc using a single usb connector. Which can use to charge a mobile phone ipod. It needs a regulated power supply of 3 3 volts supplied by a three terminal low dropout regulator. That is the black square at bottom right in the picture.
