#define LED1 25
#define LED2 33
#define LED3 32
#define BUTTON 22

#define DOT_TIME 250

long init_time = -1;
long end_time = -1;
long resulting_time;

long up_time = -1;
int button_ant;

void IRAM_ATTR toggleLED1() {
  if (digitalRead(BUTTON) == HIGH) {
    // Rising edge
    // Detect if different letter
    if (end_time != -1 && (millis() - end_time) > DOT_TIME*3*3) {
      Serial.print("/");
    }

    else if (end_time != -1 && (millis() - end_time) > DOT_TIME*3) {
      Serial.print(" ");
    }

    // Detect if different word


    end_time = -1;
    init_time = millis();
  }

  else if (end_time == -1) {
    // Rising edge
    end_time = millis();
    resulting_time = end_time - init_time;
    
    if (resulting_time >= 3*DOT_TIME) {
      Serial.print("-");
    }

    else {
      Serial.print(".");
    }
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  attachInterrupt(BUTTON, toggleLED1, CHANGE);

  pinMode(BUTTON, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(BUTTON) == HIGH) {
    if (button_ant == 0) { // Flanc ascendent
      up_time = millis();
    }
    button_ant = 1;
  }

  else {
    if (button_ant == 1) { // Flanc descendent
      up_time = -1;
    }
    button_ant = 0;
  }

  if (up_time != -1) {
    digitalWrite(LED3, HIGH);
    if ((millis() - up_time) > 2*DOT_TIME) digitalWrite(LED2, HIGH);
    if ((millis() - up_time) > 3*DOT_TIME) digitalWrite(LED1, HIGH);
  }

  else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
  }

  delay(10); // this speeds up the simulation
}