clean up before sharing

[hw/greenhouse] / README

diff --git a/README b/README
index dd827c542cc10ccbc0ac1ef217938a5906119c46..164d25ad7a01323a4e7836295e4064686b532277 100644 (file)
--- a/README
+++ b/README
@@ -26,6 +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
+