# Class for emitting messages in Morse code class Morse # Constants defining the morse code # Morse code from A to Z and 0 to 9 CODE = { "A" => ".-", "B" => "-...", "C" => "-.-.", "D" => "-..", "E" => ".", "F" => "..-.", "G" => "--.", "H" => "....", "I" => "..", "J" => ".---", "K" => "-.-", "L" => ".-..", "M" => "--", "N" => "-.", "O" => "---", "P" => ".--.", "Q" => "--.-", "R" => ".-.", "S" => "...", "T" => "-", "U" => "..-", "V" => "...-", "W" => ".--", "X" => "-..-", "Y" => "-.--", "Z" => "--..", "0" => "-----", "1" => ".----", "2" => "..---", "3" => "...--", "4" => "....-", "5" => ".....", "6" => "-....", "7" => "--...", "8" => "---..", "9" => "----."} # Morse code durations in dots DOT = 1 DASH = 3 SPACE = 1 # Space between parts of a same letter LETTER = 3 # Space between letters of a same word WORD = 7 # Space between words # Create a new morse emitter on a given port (pin) # Params: # +port+:: the port used for emmitting # +pwr+:: the emition power # +dot+:: duration of a dot is seconds def initialize(port, pwr = 256, dot_s = 0.2) # @port = AnalogIO.new(port,OUTPUT) @port = LED.new @pwr = pwr.to_i @dot = dot_s.to_f end # Emit a morse code including the delay after a letter # Param: # +code+:: the code to emit def emit_morse(code) code = code.to_s # Ensures code is a string # Emit each signal code.each_char do |s| case (s) when "." then # Emit a dot # @port.write(@pwr) @port.on sleep(DOT*@dot) # @port.write(0) @port.off when "-" then # Emit a dash # @port.write(@pwr) @port.on sleep(DASH*@dot) # @port.write(0) @port.off when " " then # Emit a space between words sleep((WORD-SPACE-LETTER)*@dot) # Note: SPACE and LETTER time are removed since # they are added afterward # Invalid signals are skipped end # Adds the delay between signals sleep(SPACE*@dot) end # Adds the delay between letters sleep(LETTER*@dot) end # Emit a text in morse code # Params: # +text+:: the text to send def emit(text) # Ensure text is an uppercase string text = text.to_s.upcase # Emit each char code = "" text.each_char do |c| # Get the Morse code corresponding to c emit_morse(CODE[c]) end end end # Testing the class # Create a morse emitter on D0 morse = Morse.new(D0) # Emit text entered from standard input loop do morse.emit(gets) end print "End of morse\n"