The K3NG firmware usually enables the Arduino’s internal pull-up resistors. This means you simply wire the paddle to ground. When you press the paddle, it pulls the pin "Low," triggering the code.
Uses a transistor (like a 2N2222) or an optoisolator to safely key the rig's PTT or Key line. Speed Control: k3ng keyer schematic
The K3NG firmware is susceptible to . If your voltage drops below 4.5V during a transmission, the Arduino resets. This is catastrophic during a contest. The K3NG firmware usually enables the Arduino’s internal
Connect to digital pins (commonly pins 2 and 5 for left/right), pulled high by the Arduino's internal resistors. Transmitter Keying: it pulls the pin "Low