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
@@ -24,3 +23,20 @@ conditions and turn the heater on if it's too cold, and the fan on if it's
 too hot.  The hydroponics pump gets turned on and off on a regular schedule.
 And the RF link provides a mechanism for remotely downloading the logged data,
 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
+