If any function does not work, re‑check the schematic connections and the pin assignments in the header files. Most build issues are due to a mismatched pin definition or a cold solder joint.
So download the schematic, heat up your soldering iron, and get on the air. 73, and may your dots be perfectly timed.
Understanding the K3NG Arduino CW Keyer Schematic The K3NG CW Keyer, designed by Anthony Good (K3NG), is the most versatile, open-source amateur radio morse code keyer available. It uses the Arduino platform to provide features ranging from basic iambic keying to advanced keyboard interfacing, display support, and computer control. k3ng keyer schematic
A standard 3.5mm or 1/4" stereo jack is needed for the paddles. Wiring: Tip: Paddle Right →right arrow Connected to Arduino Pin (typically D2). Ring: Paddle Left →right arrow Connected to Arduino Pin (typically D5). Sleeve: Ground →right arrow Connected to Arduino Ground (GND).
A 10kΩ linear potentiometer connected to an analog input (e.g., A0) for adjusting speed. If any function does not work, re‑check the
The tip and ring connect to digital pins dedicated as paddle_left and paddle_right (e.g., D2 and D5), and the sleeve connects to Ground (GND). 3. Key Output (Transceiver Interface)
The power supply section of the schematic can range from a simple USB cable (if you use an Arduino with a built‑in USB port) to a more sophisticated external regulator. For projects that need to run from a 12 V station supply, many schematics include a (e.g., the Mini‑360 module) to produce a clean 5 V for the Arduino and any added logic. Alternatively, you can power the keyer directly from the transceiver’s internal 8‑10 V auxiliary supply. 73, and may your dots be perfectly timed
: A popular version that supports many features (LCD, rotary encoders, multiple TX ports) can be found in the K5BCQ K3NG Keyer Manual .
Adding a display is optional, but it greatly enhances the usability of the keyer. The schematic must connect the LCD’s data and control lines to specific Arduino pins. The K3NG software supports both 4‑bit parallel LCDs and I²C‑backpack LCDs, the latter requiring only two wires (SDA and SCL) for communication.
Support for displays (LCD/OLED) and user-defined function buttons The Core K3NG Keyer Schematic Explained