How to Send Morse Code with a Flashlight: Step-by-Step Guide

Sending Morse code with a flashlight is one of the most practical and oldest uses of Morse code. Whether you're signaling across a valley, communicating silently, or just having fun, all you need is a light source and knowledge of the code.

Basic Principles

Morse code with light uses the same dot-and-dash system as audio Morse:

• Dot (dit): A short flash
• Dash (dah): A long flash, about 3 times the length of a dot
• Gaps: Pauses between flashes indicate character and word boundaries

Timing Guide

Pick a comfortable base speed and stay consistent:

For beginners, using 1 second per dot unit is a good starting pace. As you improve, you can speed up.

Step-by-Step: Sending a Message

Let's send "HELLO":

1. H (....): Four short flashes, with brief pauses between each
2. *Character gap*: Pause for 3 dot-lengths
3. E (.): One short flash
4. *Character gap*
5. L (.-..): Short, long, short, short
6. *Character gap*
7. L (.-..): Short, long, short, short
8. *Character gap*
9. O (---): Three long flashes

Useful Messages to Know

Tips for Clear Signaling

1. Be consistent: Keep your dot and dash lengths steady
2. Exaggerate the difference: Make dashes clearly 3x longer than dots
3. Mind your gaps: The pause between characters should be noticeably longer than between elements
4. Point your light directly: Aim at your receiver for maximum visibility
5. Agree on speed first: If possible, establish a comfortable speed with your partner
6. Use a smooth surface: Covering/uncovering the flashlight with your hand is smoother than toggling the switch

Using Your Phone as a Morse Flashlight

Modern phones make Morse code signaling easy. The Morse Code app lets you:

• Type a message and your phone's flashlight transmits it automatically with perfect timing
• Use presets for common messages like SOS
• Adjust speed to match your recipient's comfort level
• Choose screen flash if you don't have a flashlight (the screen pulses white)

The app handles all the timing math so your signals are perfectly formed every time.

Once you can send, the natural next step is a real back-and-forth. See our guide to communicating two-way with a flashlight using Morse code — how to read incoming flashes and use a simple call-and-response protocol.

Download free for iOS or Android.