help conecting two devices

i need to connect a standalone device(xbee or any other board and a cubie board computer). i need when the cubie get into range it receives some information, aka remote control, from the xbee, the range i need is no more than 3 meters. anyone could help me chosing the appropiate receiver-transmiter?? thanks a lot

hey , maybe you can use PIR sensor, and you can set the range of detection(about 10cm-7m).