These projects are perfect for Arduino.Know when someone knocks — or worse Arduino is able to interpret signals from a variety of sensors. By placing a unit equipped with an ADXL345, an ...

There are a lot of fun Arduino projects that you can accomplish with the company's nearly $25 boards.

There are at least 20 different ones available in the Arduino Store, but which among them is the best board for beginners? Let's take a look.