| Arduino Pin | Function | Schematic Detail | |-------------|------------------------|-------------------------------------------------| | D2 | Paddle Dit | 10k pull-up + 1N4148 to +5V | | D3 | Paddle Dah | Same as D2 | | D4 | LCD RS (if parallel) | Direct connection | | D5 | LCD Enable | Direct connection | | D6 | LCD D4 | Direct | | D7 | LCD D5 | Direct | | D8 | LCD D6 / PS/2 Clock | Shared? Check compile options | | D9 | LCD D7 / PS/2 Data | Shared | | D10 | Key Output (transistor)| 1k base resistor + 2N2222 + 1N4007 | | D11 | Sidetone out | To LM386 input (via 10k pot) | | D12 | PTT output | Second transistor stage | | D13 | Status LED (built-in) | Optional | | A0 | Speed pot | 10k pot + 0.1µF cap | | A1 | Command pot (mode) | Optional | | A4 (SDA) | I2C LCD / Rotary Encoder| 4.7k pull-ups | | A5 (SCL) | I2C LCD / Rotary Encoder| 4.7k pull-ups |
Once, in the silent hours of 2011, Anthony "Goody" Good , known by his callsign , released a digital ghost into the amateur radio world. It wasn’t a radio, but a blueprint—a schematic for an Arduino-based Morse code keyer that would eventually become the "Swiss Army Knife" of the ham radio community. The Blueprint of a Thousand Features
The is widely considered the "Swiss Army Knife" of Morse code keyers. Developed by Anthony Good (K3NG), this open-source, Arduino-based project provides a feature set that rivals or exceeds professional commercial units costing significantly more. Core Features and Capabilities k3ng keyer schematic
K3NG Keyer is widely considered the most versatile, open-source Morse code keyer project in the amateur radio community. Created by Anthony Good (K3NG), its schematic represents a highly modular design that can range from a simple breadboard circuit to a complex, multi-functional station controller. Evolution of the Schematic
A full-featured schematic adds:
A simple but essential feature: a connected between +5V and GND, wiper to an analog pin (e.g., A0). The schematic should include a 0.1µF capacitor from the wiper to GND to filter out noise and prevent speed jumping.
Take a look at the official PDF schematic (available on GitHub under /hardware/ ). Follow the first: | Arduino Pin | Function | Schematic Detail
Without these, stray RFI or static can cause spurious dits or lock up the keyer.
Ideal for basic setups with limited features due to memory constraints. The Blueprint of a Thousand Features The is