K3ng Keyer - Schematic Repack

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

Once tested, build on a PCB, stripboard, or inside an enclosure. 5. Advanced Features & Upgrades k3ng keyer schematic repack

An updated or "repacked" schematic for the K3NG Arduino CW Keyer SDA to Pin A4 , SCL to Pin A5 , VCC to 5V , GND to GND

: An Arduino Nano is great for basic portable builds, but use an Arduino Mega 2560 if you want the full suite of features like a CW decoder and large memories. Advanced Features & Upgrades An updated or "repacked"