D2D Controller of Droid2Droid Controller is an application for IOIO or IOIO-Q board which allow "Controller" android device to control "IOIO" android device
You can command LED state on IOIO or IOIO-Q board via WiFi network by another android device which not connected with IOIO or IOIO-Q board (but you will need to have one android device connect to IOIO or IOIO-Q board

Explain : This application use with IOIO or IOIO-Q board you can buy in www.inex.co.th
http://goo.gl/iSFHP

Circuit for this application
Connect pin 1-4 of IOIO or IOIO-Q board with LED

See more detail from www.tpemagazine.com on issue 31

Download source code from
http://goo.gl/o95XW8
or
https://github.com/akexorcist/IOIO-D2DController/