(The pricture shows the message PROGRAMS in Morse Code.) Download the MyBlocks SENDmessage (left) and RECEIVEmessage (right) into your MyBlock folder making sure they have the exact same names. Download the program Telegraph into your Default folder as usual. All three files are fully commented, so if you would like to learn how the program works in detail, just download them and read it. But for a brief explanation..The sound sensor cannot detect pitch but using the timer you can see how long a sound remains at a certain level. Since the dot is at .2 seconds and the dash at .3, the program can tell the difference and display the right symbol. Read RECEIVEmessage to learn more.