Using the Apple OS X terminal to control an Arduino
Arduino enthusiasts of the Apple persuasion have found that there is no direct way to control an Arduino with live keystroke commands as Applescript doesn't provide a way to detect keyboard strokes. However Martin Koch has described a way of doing so, using the "Terminal" application included with OS X and the with the UNIX screen command which allows communication with the serial port.
An interesting work-around for the Apple users out there. For more information and a demonstration sketch, click here. And we're on twitter and Google+, so follow us for news and product updates as well.
If you're looking for a simple way of controlling and receiving visual data from an Arduino, consider the Freetronics LCD & Keypad shield which contains a bright 16x2 character LCD and five buttons that can be read from only one analog input pin: