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To control the sign wirelessly, you will want to program an xbee chip to interface with it.  I recommend the "xbee explorer" from sparkfun.  To program your new xbee, you will need to make sure your xbee has a recent enough firmware (10A5 is recommended).  Unfortunately firmware upgrade must be done using Digi/MaxStream's "X-CTU" application which runs under windows.  This can be performed with wine and linux.  See [http://paparazzi.enac.fr/wiki/XBee_configuration paparazzi's]xbee config page and [http://www.libelium.com/squidbee/upload/3/31/Data-sheet-max-stream.pdf digi's xbee AT command set] for information about using x-ctu or minicom with your xbee.
 
To control the sign wirelessly, you will want to program an xbee chip to interface with it.  I recommend the "xbee explorer" from sparkfun.  To program your new xbee, you will need to make sure your xbee has a recent enough firmware (10A5 is recommended).  Unfortunately firmware upgrade must be done using Digi/MaxStream's "X-CTU" application which runs under windows.  This can be performed with wine and linux.  See [http://paparazzi.enac.fr/wiki/XBee_configuration paparazzi's]xbee config page and [http://www.libelium.com/squidbee/upload/3/31/Data-sheet-max-stream.pdf digi's xbee AT command set] for information about using x-ctu or minicom with your xbee.
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The Xbee on the computer side needs to have a small hardware modification to work: pins AD0 and AD1 need to be shorted, and pins AD2 and AD3 need to be shorted.  This is because the xbee connected to your computer toggles pins 0 and 2 to control the state of pins 1 and 3, and pins 1 and 3 are mirrored by the xbee connected to the sign.  If you use a stock xbee, you'll still be able to talk to the sign with it but you won't be able to flash new firmware.
 
  
 
Once you have your xbee connected to your computer, you can use xbee-pgm.pl to set it up to talk to the sign such as the following:
 
Once you have your xbee connected to your computer, you can use xbee-pgm.pl to set it up to talk to the sign such as the following:

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