Raspberry Pi 7 Port USB hub & I2C 23017 x1 16 bit GPIO Board 1. U15 I2C 23017 16 GPIO x1 with 16 SMD blue LED 2. U2 - USB 7 Ports HUB chipset J1 (JP3) USB HUB upper port signal input from Rs-Pi 3. J13 Mini USB 5V input for USB Hub, you don't need plug 5V , the USB Hub already use 5V from Raspberry Pi (P1 pin2), if your use USB device need more power, then you can plug-in 5V in this port. 4. J11 for RS-Pi V2 GPIO connector (got 4 more GPIO pin) Use this board you can learn how to program use "C" or "Python" , Will provide sample program for test can download from our web site.
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