Arduino CW Keyer

Reference website

http://blog.radioartisan.com/arduino-cw-keyer/

http://nanokeyer.wordpress.com/

Building note

Some option to be consider

a. PS2 keyboard interface to send CW signal without computer

b. LCD panel in 4-bit or I2C interface

c. WinKey emulation

d. Rotatry encoder for WPM control

e. CW decoder ?

f. Frequency counter and SWR meter ?

g. More memory key input

h. Command line support

Arduino Nano is too small(32K flash) to include more features, need consider the Arduino Mega 2560 or Teensy 3.2

For Arduino working with extra library

Three ways to find the included library,

a. copy the *.h and *.c to the same directory with *.ino

b. copy the whole directory to Arduino IDE program place (d:\arduino-1.5.2\libraries)

c. use Sketch -> Import Library... to find the zipped library package