K3ng Keyer: Schematic Repack

The K3NG keyer can generate a sidetone via a simple RC filter on a PWM pin. A repack often provides:

A repack focuses on the Arduino Nano or Pro Mini for its small footprint. The goal is to strip away the "feature creep" of the full library and provide a rock-solid, portable foundation. 1. The Microcontroller Arduino Nano (ATmega328P). Power: 5V via USB or 7-12V via the VIN pin. Clock: 16 MHz (standard on most Nanos). 2. The Keying Circuit (Rig Interface)

The K3NG Keyer code is a masterpiece of software . But the hardware documentation is a choose-your-own-adventure puzzle. k3ng keyer schematic repack

If you are designing a custom PCB, consider adding these "Pro" features:

The K3NG keyer's popularity stems from its ability to provide a robust and reliable keying solution, supporting a range of features such as: The K3NG keyer can generate a sidetone via

The K3NG Keyer is an open-source, Arduino-based CW (Morse Code) keyer developed by Anthony Good, K3NG. Unlike many DIY projects that offer a single, fixed configuration, the K3NG keyer is a highly modular and customizable platform.

A thoughtful, well-executed liberates that potential. Whether you download one from a GitHub fork or patiently redraw your own, using a repack means spending less time guessing wiring and more time sending perfect CW. Clock: 16 MHz (standard on most Nanos)

The goal of this repack is to create a reliable, RF-immune, and highly functional keyer without unnecessary complexity. It standardizes the design on the (ATmega328P) because of its low cost, built-in USB interface, and compact footprint. This configuration enables: Standard Iambic Paddle Input Straight Key Support

This article will break down the essentials of the K3NG keyer, why a "repack" is useful, and how to get started on your own build. What is the K3NG Keyer Project?

| Feature | How to Include in Schematic | Schematic Complexity | | :--- | :--- | :--- | | | Connect two pins from the encoder to Arduino digital I/O pins. Use a simple RC filter (resistor + capacitor) for hardware debouncing. | Low | | LCD Display (4-bit) | Connect the display's RS, E, D4, D5, D6, D7 pins to six Arduino digital I/O pins. Include a potentiometer for contrast adjustment. | Medium | | I2C LCD Display | Connect only the display's SDA and SCL pins to the corresponding pins on the Arduino (A4, A5 on Uno/Nano). Much simpler than 4-bit mode. | Low | | PS2/USB Keyboard | For PS/2, connect Clock and Data pins to Arduino digital I/Os. For USB HID, use an Arduino Leonardo or Due which natively supports it. | High | | Numeric Keypad | Connect an external 3x4 or 4x4 matrix keypad. Requires connecting 7 or 8 digital I/O pins to the keypad's row/column lines. | Medium | | External Memories | Connect up to 7 external switches (momentary buttons) between digital I/O pins and ground. Include 10kΩ pull-up resistors in the code or schematic. | Low |

In the world of amateur radio, the interface between the operator and the transmitter is a critical link in the communication chain. While the operator provides the rhythm and cadence, the electronic keyer provides the precision. Among the various open-source projects available to the radio amateur, the K3NG CW Keyer stands as a paragon of flexibility and feature depth. Written by Anthony Goode (K3NG), the Arduino-based firmware transforms a generic microcontroller into a world-class contesting and training tool.