relay circuit board with 4 relays added

[hw/greenhouse] / README

diff --git a/README b/README
index 22ec5f6edef4343cd389958f902ecfe3c048853d..4d8572706834e3b815b343b1a2ab8ef29d353d4e 100644 (file)
--- a/README
+++ b/README
@@ -24,3 +24,9 @@ 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:
+
+       http://www.ladyada.net/learn/sensors/cds.html
+       http://klk64.com/arduino-spi/
+