The WR703N Expander is a compact PCB providing a 4 port USB hub and dual FTDI serial ports, with additional GPIO. It is perfect for use with the small TP-Link WR703N Linux based wireless router, or with almost any computer with USB (e.g. PC, Raspberry Pi, BBB, etc). The USB hub makes it easy to add a USB flash drive to expand the routers internal flash storage, and provide connection of additional USB devices (webcam, keyboard, sound, co-processor, etc), while the serial ports and GPIO allow versatile connectivity to other devices.
It was designed by Kean Electronics in conjunction with Robots & Dinosaurs for control and automation projects, and has been used in various designs such as robotics, smart LED lighting control, and wireless sharing of quadcopter webcams.
Note this unit does not include the TP-Link WR703N router
GPIO pinout (OC = Open Collector)
J1 pin FT2232 name VCP function (Port A)
1 ADBUS4 / GPIOL0 DTR# (out)
2 ADBUS5 / GPIOL1 DSR# (in)
3 ADBUS6 / GPIOL2 DCD# (in)
4 ADBUS7 / GPIOL3 RI# (in)
5 ACBUS0 / GPIOH0 TXDEN (out)
6 ACBUS1 / GPIOH1 SLEEP# (out)
7 ACBUS2 / GPIOH2 RXLED# (OC out)
8 ACBUS3 / GPIOH3 TXLED# (OC out)
9 5V - note above pins use logic voltage set by JMP3 (VCCA)
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