Warning: This post is several years old and the author has marked it as poor quality (compared to more recent posts). It has been left intact for historical reasons, but but its content (and code) may be inaccurate or poorly written.

One of my microcontroller projects requires me to measure values and transmit then in Morse code. There may be code out there to do this already, but I couldn’t find it. I’m sure there are more elegant and efficient ways to handle the conversion, but this works for me. Hopefully someone will find it useful!

#include <stdio.h>

//Morse code numbers from 0 to 9
char * array [10] = {"-----",".----","..---","...--","....-",
	 ".....","-....","--...","---..","----."};

void beep(char v){
	// beep (or print) Morse code as necessary
	printf("%s ",array[v]);
}

void send(int l){
	// convert a number into Morse code
	char d=0;int t=0;int val=0;
	for (t=100000;t>0;t=t/10){ //number of digits here
		if (l>t){d=l/t;beep(d);l-=d*t;}else{beep(0);}
	}
	printf("n");
}

void main(){
	// program starts here
	int l=0b1111111111; //sample number (maximum 10-bit)
	printf("%d ",l);send(l);
	l=0b11010001100101100011; //larger sample number
	printf("%d ",l);send(l);
}