The Dit and Dash lines connect to individual digital I/O pins (commonly D2 and D5, though customizable in the code). The paddle's common ground connects to the Arduino GND.
Typically used for the paddle inputs (Dit and Dah).
Now that the keyer could "hear," it needed to "speak." Elias wanted to use the keyer to drive his vintage 1960s tube transmitter (a "boat anchor"). He looked at the Output Stage on the schematic. k3ng keyer schematic
The core schematic revolves around several key input and output subsystems:
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. The Dit and Dash lines connect to individual
: Connects to Digital Pin 3 (standard configuration).
Paddle inputs
Connect a standard piezo buzzer between Digital Pin 13 and GND .
A regulated 5V DC supply, often derived from a 9V-12V input. Now that the keyer could "hear," it needed to "speak
A 10kΩ linear potentiometer connected to an analog input (e.g., A0) for adjusting speed.
"I'm a hardware guy, Silas," Elias said. "I like tubes and transistors. I don't want to write code."