- -   - - -   . - .   . . .   .       - . - .   - - -   - . .   .       - - .   .   - .   .   . - .   . -   -   - - -   . - .   . - . - . -

Overview

This project generates Morse code from input text. The input is entered in console using the keyboard, and read through the USB virtual COM port. The generated code is displayed on the console, and played on the speaker and the mbed built-in LED. The Morse code generator in this project follows the International Morse code Recommendation ITU-R M.1677-1.

Components

Hardware

• mbed LPC1768

• uLCD-144-G2
  Components / 4D Systems 128 by 128 Smart Color LCD uLCD-144-G2

  128 by 128 Color Smart LCD with serial interface and SD card slot

• Speaker (including a driver transistor and a 220-1k resistor)

• Pushbuttons (6)

Software

• uLCD-144-G2 Library

  Import library4DGL-uLCD-SE

  Fork of 4DGL lib for uLCD-144-G2. Different command values needed. See https://mbed.org/users/4180_1/notebook/ulcd-144-g2-128-by-128-color-lcd/ for instructions and demo code.

  Last commit 28 Oct 2015 by jim hamblen

• Speaker using PWM Library

  Import programspeaker_demo_PWM

  Demo for new class to play a note on a speaker using a PWM output See http://mbed.org/users/4180_1/notebook/using-a-speaker-for-audio-output/

  Last commit 21 Oct 2014 by jim hamblen

• Pin Detect Library

  Import libraryPinDetect

  InterruptIn style DigitalIn debounced with callbacks for pin state change and pin state hold.

  Last commit 13 Jan 2011 by Andy K

• USB Virtual Serial Port Library

  Import library

  mbed - Serial Class Reference

  Public Member Functions
  	Serial (PinName tx, PinName rx, const char *name=NULL)
  	Create a Serial port, connected to the specified transmit and receive pins.
  void	baud (int baudrate)
  	Set the baud rate of the serial port.
  void	format (int bits=8, Parity parity=SerialBase::None, int stop_bits=1)
  	Set the transmission format used by the serial port.
  int	readable ()
  	Determine if there is a character available to read.
  int	writeable ()
  	Determine if there is space available to write a character.
  void	attach (void(*fptr)(void), IrqType type=RxIrq)
  	Attach a function to call whenever a serial interrupt is generated.
  template<typename T >
  void	attach (T *tptr, void(T::*mptr)(void), IrqType type=RxIrq)
  	Attach a member function to call whenever a serial interrupt is generated.
  void	send_break ()
  	Generate a break condition on the serial line.
  void	set_flow_control (Flow type, PinName flow1=NC, PinName flow2=NC)
  	Set the flow control type on the serial port.

• Terminal Application
  • TeraTerm was used for this project.

Connections

uLCD:

Speaker:

Pushbuttons (6):

Demo

Image of the Set-up:

Video demo of "Hello world" - console capture:

The Morse code playback on the console is in sync with the LED and speaker.

Video demo of "Hello world":

Video demo of playback controls:

Project Code

Future Work

• Implement Q code
• Implement Morse code abbreviations
• Implement Prosigns

References

“International Morse code Recommendation ITU-R M.1677-1”. itu.int. International Telecommunication Union. October 2009. http://www.itu.int/rec/R-REC-M.1677-1-200910-I/

http://en.wikipedia.org/wiki/Morse_code