I am also planing to use my Netduino 2+ to operate irrigiation system in my garden.
I plan to use:
- Solarpanel together with rechargeable batteries
- LCD panel
- temperature sensors
- bluetooth to remotely operate it
- Solenoid valves for open and close the water pipes.
LCD and temperature/humidity sensors are already working, next step is to get solenoid valves working (I already ordered one for testing).
I found somebody who did similar with Arduino/RF Transmitter:
http://rayshobby.blo...controller.html
It seems it is important to use some DC/DC step-up converter/MOSFET to operate solenoid valves.
For solarpanel and battery take a look on Sparkfun website, for example :
Charger: https://www.sparkfun.../products/12885
Battery: https://www.sparkfun.com/products/341
Solarpanel: https://www.sparkfun.com/products/7840