DFRobot Arduino Starter Kit - SOS Morse Code LED (Project 2) - YouTube
Arduino SOS signal with 8ohms speaker and LED blinking -
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.
Arduino based Morse Code Generator
Arduino SOS Beacon : 4 Steps (with Pictures) - Instructables
Arduino Projects Book - Project 02: SOS -- Morse Code Emergence Distress Singal · Drago's Blog
Morse Code with Arduino
Make a S.O.S signal using LED and Arduino - Hackster.io