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Basic concept -- an Arduino-based box that works as a combo code practice oscillator/CW keyer/audio freq generator.

Include an LCD display.

General features:

• On/off switch
• mode-switch button (cycles between modes)
• Setup to power entirely from arduino
• 1/4" jack for interface to rig (uses transistor to key/unkey)
• 3.5mm output jack for headphones/signal generator
• Pot to adjust WPM
• Pot to adjust frequency
• 3.5mm input jack for paddles
• LCD display

Initial modes:

• Keyer:

  • Iambic keyer w/ sidetone
  • WPM/FREQ adjustable, display on LCD

• Signal generator

  • Generate constant sidetone