sjmulder / morse

Encode and decode morse code

morse

Generate and parse morse code encoded as dots and dashes

morse [-d]

Reads text from standard input, outputs dots and dashes on standard output. The -d flag (for decode) reverses the process.

Un-encodable or un-decodable input is skipped. Words in morse are separated with newlines.

morse-pwmplay

Output morse on a passive buzzer with PWM

morse-pwmplay [chip [channel]]

On Linux only, with boards such as the Raspberry Pi, this utility can play the morse output on a passive buzzer.

It reads dots, dashes, spaces and newlines (as wod separators) from standard input and interfaces with the sysfs interface at /sys/class/pwm/pwmchipN/pwmN. Other input characters are ignored. The chip and channel numbers default to 0. The dot length is fixed at 50 ms.

For the Raspberry Pi, sample set up is as follows:

1. Add dtoverlay=pwm to /boot/config.txt and reboot.
2. Connect GPIO 18 to one pin of a passive buzzer.
3. Connect GND to the other pin of the buzzer.

Examples

$ echo 'Hello, World! What a day to be alive.' | morse
.... . .-.. .-.. ---
.-- --- .-. .-.. -..
.-- .... .- -
.-
-.. .- -.--
- ---
-... .
.- .-.. .. ...- .

$ echo 'Hello, World! What a day to be alive.' | morse >msg.txt
$ morse -d <msg.txt
HELLO WORLD WHAT A DAY TO BE ALIVE

$ morse-pwmplay <msg.txt
<Noise from buzzer>

Building

Should build on any Unix (but morse-pwmplay will only work on Linux). See the Makefile for more variables.

make
make install   [PREFIX=/usr/local]
make uninstall [PREFIX=/usr/local]

Legal

By Sijmen J. Mulder ([e-mail]). See LICENSE.md.