This instructable will explain how to create the circuit ,making a shield for the arduino,making some changes,displaying custom messages and how to install the Morse code library.
This instructable is a entry in the arduino contest so if you like it please vote.
Here is a short video of it in action:
The first message that it displays is the SOS the second that it displays is HI and the third message that it displays is HELLOW.You can see the LED blink for three or four times in between the message this means that a new code has been uploaded and a new message is been displayed.
Step 1: Morse Code
Each character (letter or numeral) is represented by a unique sequence of dots and dashes. The duration of a dash is three times the duration of a dot. Each dot or dash is followed by a short silence, equal to the dot duration. The letters of a word are separated by a space equal to three dots (one dash), and two words are separated by a space equal to seven dots. The dot duration is the basic unit of time measurement in code transmission.In the picture you can see the Morse code for each alphabet and number.