Schematic — K3ng Keyer
A simple piezo element can be wired directly between a designated PWM pin (often D11) and ground.
Tip for Uno builders: If you use the smaller schematic, pins 2 and 3 remain the same, but you will run out of pins quickly. You cannot use the PS2 keyboard and an LCD simultaneously on an Uno.
If you are using an Arduino Mega or a highly optimized Nano build, you can add these elements to your schematic:
So download the schematic, heat up your soldering iron, and get on the air. 73, and may your dots be perfectly timed. k3ng keyer schematic
Because the K3NG code is highly modular, you can expand your physical schematic to include several advanced hardware options:
A typically shows one or two keying outputs (though the code can support up to six). Each output includes a series‑base resistor and a pull‑up to +5 V on the collector side to ensure a definite high‑impedance state when the output is off. The output jack is usually a mono 3.5 mm plug that connects to the transceiver’s straight‑key input.
A basic K3NG keyer schematic typically includes several fundamental blocks: Arduino CW Keyer Project (Alpha) - kf4bzt - WordPress.com 6 Aug 2015 — A simple piezo element can be wired directly
Once your hardware matches your schematic, you must configure the code before uploading it via the Arduino IDE:
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A series of buttons (often connected via a resistor ladder to a single analog pin) used to trigger recorded messages or enter command mode. USB/PS2 Keyboard: If you are using an Arduino Mega or
The heart of the keyer is the . The schematic can be drawn for any of the common Arduino boards, but the connections generally follow a standard assignment defined in the software files keyer_pin_settings.h and keyer_hardware.h . For example, on a basic Arduino Pro Mini build, the following pin assignments are common:
: Connect the Arduino's hardware TX/RX lines to a USB-to-Serial chip (like the CH340 or FTDI) to interface seamlessly with logging software like N1MM or HRD.
The K3NG Keyer is an open-source Arduino-based CW (Morse Code) keyer known for its extensive features and flexibility, often competing with commercial keyers at a significantly lower cost. The design is highly flexible and can be built as a simple or advanced system. The code is modular and open-source, allowing for extensive customization by editing configuration files like keyer_features_and_options.h and keyer_pin_settings.h . The project is designed to be modular, so you don't need to install every optional component.
