Morse code question

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1

hello there,

I have a question about this code.
This is code detects morse signals, and translate it into letters.
I'm interested in taking these letters and make a word.
When a certain combination of letters is played, I want an LED to blink for 5 seconds.
How do I do that?

#define THRESHOLD (44)
#define MAX_SAMPLES (5)

#define BAUD (100.0)
#define WAIT (5.0)
#define AVG_LONG (BAUD3.0/WAIT)
#define AVG_SHORT (BAUD1.0/WAIT)
#define AVG_NEWWORD (BAUD*7.0/WAIT)
#define MINIMUM (AVG_SHORT/4.0)

#define MAX_PATTERN (64)

#define NUM_CODES (54)
// 0 10 20 30 40 50
// 0123456789012345678901234567890123456789012345678901234
static const char *letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,?'!/()&:;=+-_"$@";
// each code represents a character.
// 1 represents a dot and 0 represents a dash.
// the order of these codes matches the order of the characters in
// *letters.
static const char *codes[NUM_CODES] = {
"10", // A, codes[0]
"0111", // B, codes[1]
"0101", // C
"011", // D
"1", // E
"1101", // F
"001", // G
"1111", // H
"11", // I
"1000", // J
"010", // K
"1011", // L
"00", // M
"01", // N
"000", // O
"1001", // P
"0010", // Q
"101", // R
"111", // S
"0", // T
"110", // U
"1110", // V
"100", // w
"0110", // x
"0100", // y
"0011", // z
"00000", // 0
"10000", // 1
"11000", // 2
"11100", // 3
"11110", // 4
"11111", // 5
"01111", // 6
"00111", // 7
"00011", // 8
"00001", // 9
"101010", // .
"001100", // ,
"110011", // ?
"100001", // '
"010100", // !
"01101", // /
"01001", // (
"010010", // )
"10111", // &
"000111", // :
"010101", // ;
"01110", // =
"10101", // +
"01110", // -
"110010", // _
"101101", // "
"1110110", // $
"100101", // @, codes[54]
};

int top=0;

int samples[MAX_SAMPLES];
int si=0;
int mi=0;
int total=0;

int c=0;
int is_on=0;

char pattern[MAX_PATTERN];
int pi=0;

void setup() {
Serial.begin(57600);

for(int i=0;i<MAX_SAMPLES;++i) {
samples*=0;*
}
for(int i=0;i<MAX_PATTERN;++i) {
pattern*=0;*
}
}
void loop() {
int volume=analogRead(0);
total -= samples[si];
samples[si] = volume;
total += samples[si];
if( mi < MAX_SAMPLES ) mi++;
si = (si+1) % MAX_SAMPLES;
int average = total / mi;
if( top < average ) top = average;
int x = 10.0 * (float)(average-THRESHOLD)/(float)(top-THRESHOLD);
if(x<0) x=0;
if(x>10) x=10;
if(x>1) {
* // noise!*
if(is_on==0) {
* // noise has just started.*
if( c > MINIMUM ) {
* // Was the silence a new word or a new letter?*
if( c > (AVG_NEWWORD+AVG_SHORT)/2.0 ) {
pattern[pi]=0;
findLetter();
* // new word, extra \n*
Serial.println();
* // start counting - and . all over again.*
pi=0;
} else if( c > (AVG_LONG+AVG_SHORT)/2.0 ) {
pattern[pi]=0;
findLetter();
* // start counting - and . all over again.*
pi=0;
}
}
* // remember noise started*
is_on=1;
c=0;
}
} else {
* // silence!*
if(is_on==1) {
* // silence is new*
if( c > MINIMUM ) {
* // Was the noise a long or a short?*
if( c > (AVG_LONG + AVG_SHORT)/2.0 ) {
* // long*
Serial.print('-');
pattern[pi++]='0';
} else {
* // short*
Serial.print('.');
pattern[pi++]='1';
}
}
* // remember silence started*
is_on=0;
c=0;
}
}
c++;
delay(WAIT);
}
* // pattern contains the received longs and shorts,*
* // saved as 1s and 0s. Find the matching code in the list*
* // then find the matching printable character.*
* // print '?' if nothing is found*
void findLetter() {
int i,j;
* // go through all the codes*
for(i=0;i<NUM_CODES;i++) {
_ // check if code matches pattern exactly.
if(strlen(pattern) == strlen(codes) && strcmp(pattern,codes*)==0) {
// match!
Serial.print(' ');_
_Serial.println(letters);
return;
}
}
Serial.print('?');
}*_

2

You really need to work on those code tags.
The compiler doesn't like italics.

3

okay, but this is my first arduino experience,
so i have no clue how to make any....

4

Please read this:-
How to use this forum
Because your post is breaking the rules about posting code. This is needed because if you look at your code it is switched into italics by the forum software and using code tags prevents this.

How many letters do you want to trigger the blinking light?
Take each letter as it comes it and put it at the start of an array of length equal to the numbers you want to check. Before you put the new letter in you shift the letters in the array up to make room for the new one. The process of shifting up will loose one letter. In other words it falls out of the end.

When ever you have put a new letter into the array you look at the whole array to see if it matches your trigger pattern or trigger array. If it does you set a boolean variable to true, call this something like blinking. Then at the start of the loop check the blinking variable and if it is true blink the LED. A simple way to do this is to do:-

digitalWrite(ledPin, millis() & 0x1000);

when your blink variable is true.

How do you want to make it stop blinking or do you want it to go on forever?