Requires 6 digital pins and a contrast pot, significantly cluttering the schematic. Stick to I2C whenever possible. PS/2 Keyboard Interface
The biggest mistake new builders make is connecting Pin 9 (Key Out) directly to their radio's "CW Key" jack.
The Morse paddle connects directly to the Arduino's digital input pins. k3ng keyer schematic
Because this device operates in close proximity to High-Frequency (HF) radio transmitters, can cause the Arduino to freeze, crash, or send random strings of dits and dahs. To bulletproof your K3NG schematic against RF:
The K3NG Keyer is a well-known keyer design that has been widely adopted by amateur radio operators. It is based on an Arduino microcontroller and features a simple, yet robust design. The K3NG Keyer supports various features, including: Requires 6 digital pins and a contrast pot,
To build a reliable keyer that protects your amateur radio equipment, you must implement proper interfacing circuits. Do not connect Arduino pins directly to your transceiver. A. Paddle Input Circuit
: Use internal Arduino pull-up resistors ( INPUT_PULLUP in code). For high-RF environments, add a 0.01µF capacitor from each line (Dot and Dash) to ground to prevent stray RF from causing false triggers. 2. Transmitter Keying Output (The Interface) The Morse paddle connects directly to the Arduino's
Configure settings using your paddle and Morse code.