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  • TP-Link WR703N Expander

  • $25.90
  • From WISH
 
 

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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.
 
 
Features
  • Compact size - designed to piggy back above WR703N router PCB
  • Uplink USB port can be via mini-B, or 4 pin header to connect to WR703N
  • 3 available USB ports with alternate connection options (4 pin header or USB A female)
  • 2 FTDI virtual COM (serial) ports – using common 6 pin FTDI pinout (with RTS/CTS)
  • Selectable 3.3V or 5V I/O voltages for Port A and Port B
  • 8 GPIO (part of Port A) – see GPIO pinout below
  • EEPROM for use with FTDI FT_PROG configuration utility
  • Incorporates FTDI MPSSE functions – allows SPI/I2C/JTAG emulation (e.g. see FTDI App Note AP_135)
  • Can be powered from WR703N, or supply power to WR703N (short R113 on router)
  • Works with most operating systems (FTDI driver required)
  • Open source hardware design
  • Info on OpenWRT and the WR703N available at http://wiki.openwrt.org/toh/tp-link/tl-wr703n and http://www.madox.net/blog/projects/tp-link-tl-wr703n/
 
Important
Note this unit does not include the TP-Link WR703N router
 
Specification
  • Uses Genesys Logic GL850G USB hub IC, and FT2232L dual serial IC
  • Connectors for USB and I/O come separately to allow end user customisation
  • Weight: approx 7g-20g (depending on connectors installed)
  • Size: 48x50x3mm (without connectors)
  • PDF Schematic
  • Eagle design files SCH & BRD

 

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)
10        GND

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