What does this board do?

• Allows you to control power of a USB device connected - using a Raspberry Pi GPIO, a switch/pushbutton or a simple jumper
• Allows you to momentarily disconnect power from your USB device using just a pushbutton (avoiding plugging/unplugging the cable)
• This board also works as a MicroUSB-female USB adapter, allowing you to turn any MicroUSB cable into a USB extension cable in a pinch
• Also works as a pin-header-to-USB-power adapter in a pinch
• Allows you to disconnect USB data lines from the MicroUSB port (for now, by cutting two solder jumpers)
• Has helpful green LEDs on input power, output power and control pin, too!

Technical characteristics:

• Uses a FDN302P (IRLML6401 equivalent, but with 2.5V Vgs) FET controlled by a BC847 transistor to switch the power on and off (active low)
• There are footprints for both pullup and pulldown resistors on the BC847 gate, allowing you to set power to either default-on or default-off
• Prototyping-friendly 4-pin header, with all important points (VIN/CTRL/GND/VOUT) broken out