Static String letters = code = "" //reset code to blank string numberFound = false //reset to search for numbers again. Return '-' //if button press more than 0.6sec, it is a dashįunction for converting dots and dashes into alphabet: Return '.' //if button press less than 0.6sec, it is a dot If (signal_len > 50) //to account for switch debouncingĬode += readio() //function to read dot or dash Signal_len = t2 - t1 //time for which button is pressed Main Loop for running program and decoding:ĭigitalWrite(ledPin, HIGH) //LED on while button pressedĭigitalWrite(ledPin, LOW) //LED off on button release PinMode(inputPin, INPUT_PULLUP) //internal pullup resistor is used to simplify the circuit Setup the serial connection and I/O pins: String code = "" //string in which one alphabet is stored Faster LCD library hd44780 used in the final version.Unsigned long signal_len,t1,t2 //time for which button is pressed int inputPin = 2 //input pin for push button.For this project the resources were particulalry useful. Thanks to everyone that provides information online. Useful links used to develop this project Where there is long gaps between characters. When there is significant differences between the length of characters and gaps.Automatic speed tracking when there is not a large speed variation between transmitted signals, that is when the speed changes by more than 2.More details of the project are available on my blog It's just the result of a challenge I set myself. There are other morse code to text decoders online. The bottom line displays the the most recent morse displayed as dots and dashes. The second and third line display the most recent characters of received morse in plain text. The set length (in words per minute) and the actual speed of the last receved dot are displayed on the top line of the LCD display.
While auto mode attempts to track the speed, manual mode usually gives the best results.
Speed adjustment is set by a potentiometer to the sending speed of the morse or alternatively the unit can be set to automatic mode. Using a microphone module connected to an Arudio nano, recieved pulses of morse code are convereted to plain text and and displayed on a 20x4 LCD module.
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