He found that while this worked, the Arduino was so fast that it detected very short pulses that the human ear could not detect. He calibrated the system so that a quiet room would read zero. The more asterisks, the louder the signal. He wrote a basic sketch to read the input from the microphone and output the perceived volume over a Serial monitor as a series of asterisks. He started out with an Arduino and a simple microphone. His project log is a good example of the natural progression we all make when we are learning something new. decided to take a shortcut and use some modern technology to make it easier to translate Morse code back into readable text. There are still plenty of hobbyists out there practicing for the fun of it. That doesn’t mean that Morse code is dead, though. You don’t even need to know Morse code to get an amateur radio license any more. Nowadays, it’s been replaced with more sophisticated technologies that allow us to transmit voice, or data much faster and more efficiently. Before voice transmissions were possible over radio, Morse code was all the rage. Morse code used to be widely used around the globe.
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