add presentation deck from the LCA 2011 Arduino miniconf

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diff --git a/electronics/greenhouse/index.mdwn b/electronics/greenhouse/index.mdwn
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 ## Artifacts
 
 
 ## Artifacts
 

+Bdale's [presentation](GreenhouseShield.odp) from the Arduino Miniconf 
+at LCA 2011 in Brisbane.
+

 A schematic for this circuit can be found in the 
 the [hw/greenhouse](http://git.gag.com/?p=hw/greenhouse;a=summary) 
 repository at [git.gag.com](http://git.gag.com).
 A schematic for this circuit can be found in the 
 the [hw/greenhouse](http://git.gag.com/?p=hw/greenhouse;a=summary) 
 repository at [git.gag.com](http://git.gag.com).