Sending Morse Code with your Arduino - CodeProject
multiwingspan
How to Create a Morse Code Generator Using Arduino
Arduino based Morse Code Generator
GitHub - two-engineers2/Arduino-Morse-Code-with-LED-and-Buzzer: Step by step instructions with explanations to construct an LED and piezo buzzer circuit and program it to communicate SOS and other messages in morse code using Arduino.
Basics: Project 012m Flashing LED and active piezo buzzer - Translator to Morse code at Acoptex.com / ACOPTEX.COM