clean up before sharing

[hw/greenhouse] / README

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 Greenhouse Shield for Arduino
-Copyright 2010 by Bdale Garbee, released under the TAPR Open Hardware License
 
 This is a board my son Robert is building to monitor and control conditions 
 in our back yard greenhouse.  The objective is a "shield" for an Arduino
@@ -27,6 +26,17 @@ changing setpoints and schedules, manual override, etc.
 
 References:
 
+    various relevant circuit fragments:
        http://www.ladyada.net/learn/sensors/cds.html
        http://klk64.com/arduino-spi/
+       http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1264143673
+
+    pcb layout in gEDA of an Arduino shield:
+       http://lowvoltagelabs.com/products/videooverlayshield/
+
+    5 to 3.3 volt level shifting with a MOSFET ...
+       http://www.rocketnumbernine.com/2009/04/10/5v-33v-bidirectional-level-converter/
+
+    DS1307 i2c example code
+       http://www.glacialwanderer.com/hobbyrobotics/?p=12