K3ng Keyer Schematic | Repack

: Match the software pins to your physical wiring. If you have custom PCB traces, this is where you "repack" the software to fit the hardware. keyer_hardware.h

This report provides an overview of the K3NG keyer schematic and possible repack with modern upgrades. If you're interested in building or modifying a K3NG keyer, I recommend exploring the various resources available online, including the original K3NG keyer documentation and community forums. k3ng keyer schematic repack

or shifting from the memory-constrained Arduino Uno/Nano to the more powerful Arduino Mega 2560 : Match the software pins to your physical wiring

SDA to Pin A4 , SCL to Pin A5 , VCC to 5V , GND to GND . Arduino Nano Pin Assignment Reference Table Arduino Nano Pin External Component Speed Pot 10k Potentiometer Wiper Filter with 10nF cap Dit Input Paddle Left / Tip Internal Pull-up used Dah Input Paddle Right / Ring Internal Pull-up used I2C SDA Display SDA Requires display enabled in code I2C SCL Display SCL Requires display enabled in code Sidetone Speaker / Piezo Pass through RC filter Command Push Button to GND For entering configuration menu Key Output Optocoupler Input (PC817) Triggers transmitter keying PTT Output Optocoupler Input (PC817) Triggers amplifier or rig PTT Firmware Configuration Tips If you're interested in building or modifying a

This is where beginners get RFI issues. The repack highlights:

The keyer circuit uses a simple interrupt-based approach to generate the Morse code dots and dashes. The microcontroller reads the key closure and generates the corresponding Morse code sequence.

PCB design