#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_HMC5883_U.h>
     
// CONFIGURAZIONE
const byte P_LED = 9;
const byte P_SET = 6;
const byte P_RESET = 7;
const byte P_RELE_APRE = 10;    //relè x sbloccare porta
const byte P_RELE_BLOCCA = 11;  //rele x bloccare porta
     
Adafruit_HMC5883_Unified mag = Adafruit_HMC5883_Unified(12345);  //identifiacativo magnetometro
     
LiquidCrystal_I2C lcd(0x27, 16, 2);  //display lcd x la visualizzazione dell orario
     
RTC_DS3231 rtc;
DateTime now;
     
char str[3];
int stato1 = 0;
int val = 0;
     
int val0 = 0;
     
// Buffer per la composizione delle stringhe da inviare via seriale
char outBuf[20];
int headingDegrees;
     
void setup() {
      Wire.begin();
      Serial.begin(9600);
     
      lcd.backlight();
      lcd.init();
     
      //pulsanti set e reset
      pinMode(P_SET, INPUT);
      pinMode(P_RESET, INPUT);
      pinMode(P_LED, OUTPUT);
      pinMode(P_RELE_APRE, OUTPUT);
      pinMode(P_RELE_BLOCCA, OUTPUT);
      digitalWrite(P_RELE_APRE, HIGH);
      digitalWrite(P_RELE_BLOCCA, HIGH);
     
      if (!rtc.begin()) {  //inizializzo l rtc
        Serial.println("Couldn't find RTC");
        while (true)
          ;
      }
     
      if (!rtc.lostPower()) {
        //Serial.println("RTC is NOT running, let's set the time!");
        rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
      }
      if (!mag.begin())  //inizializzo il magnetometro
      {
        /* There was a problem detecting the HMC5883 ... check your connections */
        Serial.println("Ooops, no HMC5883 detected ... Check your wiring!");
        while (1)
          ;
      }
}
     
void loop() {
      MostraOra();
      //char outBussola[8];
      bussola(); // richiama la routine che legge i gradi
      if (Serial.available()) {
        // Gestione comandi da VB
        // Per ora leggo solo un singolo carattere per volta
        char comando = Serial.read();
        switch (comando) {
          case 'A':
            digitalWrite(P_RELE_APRE, LOW);
            delay(100);  // attivo o disattivo i rele in base al comando ricevuto da visual basic
            digitalWrite(P_RELE_APRE, HIGH);
            break;
          case 'O':
            digitalWrite(P_RELE_BLOCCA, LOW);
            delay(100);
            digitalWrite(P_RELE_BLOCCA, HIGH);
            break;
          default:
            // Ignoro qualsiasi altro carattere
            break;
        }
      }
       val = 0;
      // Somma tre letture consecutive
      for (int i = 0; i < 3; ++i)
          val += analogRead(A0);
 
      // Calcola la media
      val = val / 3;
      // Riporta il valore tra 0 e 100            
      val = map(val, 0, 1023, 0, 100);  // visualbasic cosi regolerà il volume del player
       
      sprintf(outBuf, "%d;%d", headingDegrees, val); // concatena i due valori separati da puntovirgola
  Serial.println(outBuf); // invii alla seriale
     
      delay(300); // aggiustare valore per migliori prestazioni tra 50 e 500
}
     
void bussola() {  //evento bussola per indicare i gradi del magnetometro,
      sensors_event_t event;
      mag.getEvent(&event);
      float heading = atan2(event.magnetic.y, event.magnetic.x);
      float declinationAngle = 0.06;
      heading += declinationAngle;
      if (heading < 0) {
        heading += 2 * PI;
      }
      if (heading > 2 * PI) {
        heading -= 2 * PI;
      }
      headingDegrees = heading * 180 / M_PI;
}
     
void MostraOra() {
      switch (stato1) {
        case 0:
          displayTime();
          break;
        case 1:
          setHour();
          break;
        case 2:
          setMinute();
          break;
        case 3:
          setSecond();
          break;
        case 4:
          setyear();
          break;
        case 5:
          setmonth();
          break;
        case 6:
          setday();
          break;
      }
}
     
     
    unsigned long t1, dt1;
    bool FIRST = true;
     
void displayTime() {
      if (FIRST) {
        lcd.clear();
        t1 = millis();
        FIRST = false;
      }
     
      dt1 = millis() - t1;
      if (dt1 > 1000) {
        now = rtc.now();
        lcd.setCursor(4, 1);
     
        sprintf(str, "%02d", now.hour());
        lcd.print(str);
        lcd.print(':');
        sprintf(str, "%02d", now.minute());
        lcd.print(str);
        lcd.print(':');
        sprintf(str, "%02d", now.second());
        lcd.print(str);
     
        lcd.setCursor(3, 0);
     
        sprintf(str, "%02d", now.day());
        lcd.print(str);
        lcd.print('/');
        sprintf(str, "%02d", now.month());
        lcd.print(str);
        lcd.print('/');
        sprintf(str, "%02d", now.year());
        lcd.print(str);
     
        t1 = millis();
      }
     
      if (digitalRead(P_SET)) {
        //imposta ora
        stato1 = 1;
        delay(300);
        FIRST = true;
      }
}
     
    int seth = 0;
     
void setHour() {
      if (FIRST) {
        lcd.clear();
        now = rtc.now();
        seth = now.hour();
        lcd.setCursor(0, 0);
        lcd.print("Imposta ora");
        FIRST = false;
      }
      lcd.setCursor(0, 1);
      sprintf(str, "%02d", seth);
      lcd.print(str);
     
      if (digitalRead(P_RESET)) {
        seth++;
        if (seth >= 24) seth = 0;
        delay(200);
      }
      if (digitalRead(P_SET)) {
        //salva ora scelta e passa ai minuti
        rtc.adjust(DateTime(now.year(), now.month(), now.day(), seth, now.minute(), now.second()));
        stato1 = 2;
        FIRST = true;
        delay(200);
      }
}
     
    int setm;
void setMinute() {
      if (FIRST) {
        lcd.clear();
        now = rtc.now();
        setm = now.minute();
        lcd.setCursor(0, 0);
        lcd.print("Imposta minuti");
        FIRST = false;
      }
      lcd.setCursor(0, 1);
      sprintf(str, "%02d", setm);
      lcd.print(str);
     
      if (digitalRead(P_RESET)) {
        setm++;
        if (setm >= 60) setm = 0;
        delay(200);
      }
      if (digitalRead(P_SET)) {
        //salva min scelta e passa ai sec
        rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour(), setm, now.second()));
        stato1 = 3;
        delay(200);
        FIRST = true;
      }
}
     
    int sets = 0;
     
void setSecond() {
      if (FIRST) {
        lcd.clear();
        now = rtc.now();
        sets = now.second();
        lcd.setCursor(0, 0);
        lcd.print("Imposta sec.");
        FIRST = false;
      }
      lcd.setCursor(0, 1);
      sprintf(str, "%02d", sets);
      lcd.print(str);
     
      if (digitalRead(P_RESET)) {
        sets++;
        if (sets >= 60) sets = 0;
        delay(200);
      }
      if (digitalRead(P_SET)) {
        //salva sec scelta e passa ai minuti
        rtc.adjust(DateTime(now.year(), now.month(), now.day(), now.hour(), now.minute(), sets));
        stato1 = 4;
        delay(200);
        FIRST = true;
      }
}
     
    int sety = 0;
     
void setyear() {
      if (FIRST) {
        lcd.clear();
        now = rtc.now();
        sety = now.year();
        lcd.setCursor(0, 0);
        lcd.print("Imposta anno");
        FIRST = false;
      }
      lcd.setCursor(0, 1);
      sprintf(str, "%02d", sety);
      lcd.print(str);
     
      if (digitalRead(P_RESET)) {
        sety++;
        if (sety >= 9999) sety = 0;
        delay(200);
      }
      if (digitalRead(P_SET)) {
        //salva sec scelta e passa ai minuti
        rtc.adjust(DateTime(sety, now.month(), now.day(), now.hour(), now.minute(), now.second()));
        stato1 = 5;
        delay(200);
        FIRST = true;
      }
}
     
    int setmo = 0;
     
void setmonth() {
      if (FIRST) {
        lcd.clear();
        now = rtc.now();
        setmo = now.month();
        lcd.setCursor(0, 0);
        lcd.print("Imposta mese");
        FIRST = false;
      }
      lcd.setCursor(0, 1);
      sprintf(str, "%02d", setmo);
      lcd.print(str);
     
      if (digitalRead(P_RESET)) {
        setmo++;
        if (setmo >= 12) setmo = 0;
        delay(200);
      }
      if (digitalRead(P_SET)) {
        //salva sec scelta e passa ai minuti
        rtc.adjust(DateTime(now.year(), setmo, now.day(), now.hour(), now.minute(), now.second()));
        stato1 = 6;
        delay(200);
        FIRST = true;
      }
}
     
    int setd = 0;
     
void setday() {
      if (FIRST) {
        lcd.clear();
        now = rtc.now();
        setd = now.day();
        lcd.setCursor(0, 0);
        lcd.print("Imposta giorno");
        FIRST = false;
      }
      lcd.setCursor(0, 1);
      sprintf(str, "%02d", setd);
      lcd.print(str);
     
      if (digitalRead(P_RESET)) {
        setd++;
        if (setd >= 32) setd = 0;
        delay(200);
      }
      if (digitalRead(P_SET)) {
        //salva sec scelta e passa ai minuti
        rtc.adjust(DateTime(now.year(), now.month(), setd, now.hour(), now.minute(), now.second()));
        stato1 = 0;
        delay(200);
        FIRST = true;
      }
}