K3ng Keyer Schematic -

You can assign physical buttons to trigger pre-recorded Morse messages (e.g., "CQ CQ DE K3NG").

You must never connect an Arduino pin directly to a transceiver's key jack. High voltages or reverse currents from the rig can instantly destroy the microcontroller.

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).

One of the more advanced options is connecting a . The schematic for a PS/2 keyboard is straightforward: two pins (clock and data) with 4.7 kΩ pull‑up resistors to +5 V. USB keyboards are usually connected through a USB‑to‑serial adapter, which appears to the Arduino as a serial device. Likewise, a matrix keypad (3×4 or 4×4) can be wired directly to eight or more Arduino pins. The schematic for the keypad is simply the standard row‑column matrix connection.

— 73, and happy homebrewing.

A momentary push button to enter command mode, often paired with an LED indicator. Understanding the keyer_pin_settings.h File

Requires 6 digital pins and a contrast pot, significantly cluttering the schematic. Stick to I2C whenever possible. PS/2 Keyboard Interface

Because the code runs on an Arduino, the schematic is simply the wiring map to unlock these features. You can build a minimal keyer with three wires, or a deluxe command station with 40 components. The schematic scales with you.

Install resistors, then capacitors, then transistors, followed by headers, buttons, and finally the Arduino Nano. The nKeyer manual recommends building from the board centre outward, placing the Arduino Nano last. k3ng keyer schematic

The schematic is not a static document but a template for customization. By altering the wiring and the corresponding keyer_features_and_options.h file in the code, users can add: Command Buttons: For accessing memories or changing modes. Rotary Encoders: For precise speed or frequency adjustments. PS/2 or USB Interfacing: Allowing a standard keyboard to send Morse code. WinKeyer Emulation:

Arduino Pin → 1kΩ resistor → Transistor Base Transistor Collector → Key Line (to radio) Transistor Emitter → GND A 10kΩ resistor from base to emitter ensures the transistor stays off when the pin is low.

The solves this with a 2N2222A transistor (or BS170 MOSFET) and a 1kΩ base resistor .

Download the source code from the official . Open the project in the Arduino IDE. Navigate to the keyer_features_and_options.h tab. You can assign physical buttons to trigger pre-recorded

Connects to Arduino Digital Pin D2 and GND .

Start with the minimal build (Arduino + 2 resistors + 1 transistor + 2 paddles). Once you get a "dit" on the air, add the LCD. Then add the encoder. Then add the PS2 keyboard. The schematic supports it all.

Connected between an Arduino output pin (e.g., D13) and Ground. A small capacitor (e.g.,

The is a legendary open-source Morse code keyer project based on Arduino, designed by Anthony Good (K3NG). It is known for its massive feature set, including Winkeyer emulation , LCD support, and CW decoding. Core Hardware Components A basic K3NG build typically requires the following: HL2 and OpenCWKeyer K3NG Winkeyer - Google Groups A standard 3