Project to put together and support a Quail webcam for 2016, called Quail Cam, from a beagleboard computer and an ip camera.
Microcontrollers, like the Arduino, are great for manipulating lower voltage devices. On their own, they are limited in terms of the amount of voltage and current they can provide to devices. Many first Arduino projects involve motors, and LEDs, that require the use of transistors and additional external power sources.
There are a lot of DIY moisture sensor articles out there. They are quite basic in principle. Gardenisto articles assume basic knowledge of programming,