OH2CME Microkeyer

Microkeyer is an pocket sized Morse code keyer based on
the Arduino Pro Micro board. Use it to transform any iambic paddle key into a USB input device for phones
and computers.

Bill of materials

• Arduino Pro Micro (physical size 17,9 mm x 33 mm)
• 4 x M3 brass threaded inserts
• 4 x M3 x 5 mm hex socket cap screws
• 2 x 10 kΩ resistors
• Piezo buzzer
• 3,5 mm stereo jack (barrell shape, diameter 8 mm)
• 3D printed enclosure (see provided STL file)

Wiring

• Connect buzzer to pin 14 and ground.
• Connect stereo jack tip and middle connector to pins 6 and 7 with pull-op resistors.
• Connect stere jack sleeve to ground.