Arduino code for a wireless soil moisture sensor
The transmitter code (solarSensorTx) is intended for an ATTiny85 running inside the garden light.
Two example reciever sketches are included: solarSensorRxLCD prints readings to a 20x4 LCD (and serial) solarSensorRxRTC uses a DS3232 clock and prints timestamped CSV data over serial (for later analysis)
For more information: http://www.dolenle.com/proj4.html