/*
Although there are countless Morse Code translators when searching on the web,
for this project we adapted code from:

Project #3 Morse Code Translator
30 Arduino Projects for the Evil Genius - Simon Monk

We added in Mission #5 - Light Dimmer to adjust the volume of the Piezo Buzzer.


*/

int ledPin = 12;
int buzzerPin = 11; // Must use PWM pin to control volume
int volume;


char* letters[] = {
".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", // A-I
".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", // J-R
"...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.." // S-Z
};

char* numbers[] = {"-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----."};

int dotDelay = 200;

void setup()
{
pinMode(ledPin, OUTPUT);
pinMode(buzzerPin,OUTPUT);
Serial.begin(9600);
}

void loop()
{
char ch;
if (Serial.available()) // is there anything to be read from USB?
{
ch = Serial.read(); // read a single letter
if (ch >= 'a' && ch <= 'z')
{
flashSequence(letters[ch - 'a']);
}
else if (ch >= 'A' && ch <= 'Z')
{
flashSequence(letters[ch - 'A']);
}
else if (ch >= '0' && ch <= '9')
{
flashSequence(numbers[ch - '0']);
}
else if (ch == ' ')
{
delay(dotDelay * 4); // gap between words
}
}
}

void flashSequence(char* sequence)
{
int i = 0;
while (sequence[i] != NULL)
{
flashDotOrDash(sequence[i]);
i++;
}
delay(dotDelay * 3); // gap between letters
}

void flashDotOrDash(char dotOrDash)
{
digitalWrite(ledPin, HIGH);
volume=map(analogRead(A0),0,1023,1,200); // The Map function
// potValue = analogRead(potPin);
analogWrite(buzzerPin, volume);

if (dotOrDash == '.')
{
delay(dotDelay);
}
else // must be a -
{
delay(dotDelay * 3);
}
digitalWrite(ledPin, LOW);
analogWrite(buzzerPin, LOW);

delay(dotDelay); // gap between flashes
}