K3ng Keyer Schematic -

Highly recommended because it only requires 4 wires. Connect VCC to 5V , GND to GND , SDA to A4 (on Nano/Uno), and SCL to A5 .

Tip: Connects to the Collector of a 2N2222 (or similar NPN) transistor. Base: Connects to an Arduino Digital Pin (via a resistor). Emitter: Ground. Digital Pin →right arrow →right arrow Piezo Speaker →right arrow

The K3NG CW Keyer, designed by Anthony Good (K3NG), is the most versatile, feature-rich, and customizable open-source Morse code keyer available to amateur radio operators. Built on the accessible Arduino platform, this keyer can be scaled from a simple, budget-friendly practice device to a high-end, studio-grade station controller. k3ng keyer schematic

Put a red box around pins 20 & 21. You don't need them for basic functionality.

If you are looking for the most flexible keyer, downloading the latest and mapping it to a custom schematic is the way to go. If you tell me: Highly recommended because it only requires 4 wires

Supports standard paddles, straight keys, and computer keying. Understanding the K3NG Keyer Schematic

Paddle inputs

When you download k3ng_keyer-master.zip from GitHub and open the /hardware folder, you will find PDF schematics. Look for these specific labels:

Up to 12 memory buttons can be added, typically using a resistor ladder on a single analog pin to save space. Input Devices: Interfaces for PS/2 keyboards or USB host shields for computer-less keyboard operation. Base: Connects to an Arduino Digital Pin (via a resistor)