Nibbles and Bits
The Care and Feeding of My Pet Arduino

by Budd Churchward - WB7FHC - NIBBLES AND BITS LIBRARY


Teaching Arduino to Copy Morse Code

« 1 2 3 4 5 6 7 8 9 10 11  12  13 15 16 17 18 19 »

Section 12

In this section we will not be making any changes to the sketch. If any errors have found their way into your version, copy everything listed here and use it to start a fresh version of your project.

So here is your assignment, send the following letters in Morse Code. Send them slowly and carefully in the order we have them here:
T E M N A I O

Did you get the digits: 2 3 4 5 6 7 8?

The smallest number we are going to produce with our system is 2 for the letter T. There isn't anything you can send that will give you a 0 or a 1. In the next section, we will create an array of letters that will continue this sequence: # # T E M N A I O G K D W R U S ... and then pull one character out of the list using Arduino's magic little number that we have worked so long to produce.

Next Section »

International Morse Code
   A •-
   B -•••
   C -•-•
   D -••
   E •
   F ••-•
   G --•
   H ••••
   I ••
   J •---
   K -•-
   L •-••
   M --
   N -•
   O ---
   P •--•
   Q --•-
   R •-•
   S •••
   T -
   U ••-
   V •••-
   W •--
   X -••-
   Y -•--
   Z --••
   
   1 •----
   2 ••---
   3 •••--
   4 ••••-
   5 •••••
   6 -••••
   7 --•••
   8 ---••
   9 ----•
   0 -----
   
   . •-•-•- [period]
   , --••-- [comma]
   ? ••--•• [question mark]
   ! -•-•-- [exclamation mark]
   @ •--•-• [at sign]
   - -••••- [hyphen]
   : ---••• [colon]
 




int myKey=14;    // We are borrowing Analog Pin 0 and using it as digital
int speaker=11;  // Speaker will be hooked between pin 11 and ground

int val=0;       // A value for key up and down
int myTone=440;  // Freq. of our tone

boolean ditOrDah=true;
int dit=100;

boolean characterDone=true;
int myBounce=2;
int downTime=0;

long FullWait=10000;
long WaitWait=FullWait;

int myNum=0;

void setup() {
  pinMode(myKey, INPUT);
  pinMode(speaker,OUTPUT);
  // initialize the serial communication:
  Serial.begin(9600);
}



 void loop() {
   val=digitalRead(myKey);
   if (val) keyIsDown();
   if (!val) keyIsUp();
 }
 
 void keyIsDown() {
   tone(speaker,myTone);
   WaitWait=FullWait;
   downTime++;   //Count how long the key is down
 
  if (myNum==0) {
      myNum=1;  // This is our start bit
    }
   characterDone=false;
   ditOrDah=false;
   delay(myBounce);
 }

 void keyIsUp() {
   noTone(speaker);
   if (!ditOrDah) {
       shiftBits();
   }
  if (!characterDone) {
      WaitWait--;  //We are counting down
      if (WaitWait==0) {

 
        Serial.print(myNum, DEC);
        Serial.print(' ');
        characterDone=true;
        myNum=0;
      }

      downTime=0;
    }
}
void shiftBits() {
  WaitWait=FullWait;
  ditOrDah=true;
  if (downTime<dit) {
    // We got a dit
    myNum = myNum << 1;  //shift bits left
    myNum++;
  }
  else {
    // We got a dah
    myNum = myNum << 1; // shift bits left
  }
}