Hello here is my work with netduino :
[*]webserver
[*]measuring temperature water
[*]water level
[*]fotocell
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Webserver
Netduino must be connect to router with LAN cable (or wifi) and notebook is connect with USB cable to netduino plus and to router (wifi).
Here is link to video : www.youtube.com/watch?v=O--RYzg-Tfg
Measuring temperature water
I am using water sensor DS18B20. Wiring diagrams : http://2i.sk/f7f694be6d
Photocell
I am using Mini Photocell Light Sensor. Wiring diagrams : http://2i.sk/a2a3c1eb38
link to video : www.youtube.com/watch?v=x7kYumvks9M&feature=youtu.be
Ultrasonic Sensor
I am using HC-SR04. Wiring diagrams : http://2i.sk/b3b2d0fa29