/*
Source code for LCD: https://docs.arduino.cc/learn/electronics/lcd-displays
Source code for Rotary encoder: https://www.instructables.com/Improved-Arduino-Rotary-Encoder-Reading/
                                https://create.arduino.cc/projecthub/MisterBotBreak/how-to-use-a-rotary-encoder-16e079
Source code for servo: https://docs.arduino.cc/learn/electronics/servo-motors
*/

#include <LiquidCrystal.h>
#include <Servo.h>

const int rs = 9, en = 8, d4 = 7, d5 = 6, d6 = 5, d7 = 4;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

int val; 
int PinCLK = 11;
int PinDT = 12;
int PinSW = 13;
static long encoderPos = 0;
int PinCLKLast = LOW;
int nbPas = 180;
int n = LOW;

Servo myservo;

int BuzzPin = 10;

void setup() {

  lcd.begin(16, 2);
  lcd.print("Testing code-V0!");
  lcd.setCursor(0, 1);
  lcd.print("Angle= ");

  pinMode (PinCLK,INPUT);
  pinMode (PinDT,INPUT);
  pinMode (PinSW,INPUT);

  myservo.attach(3);
  myservo.write(0);

  pinMode (BuzzPin,OUTPUT);
}

void loop() {
  
  n = digitalRead(PinCLK);
   
   if ((PinCLKLast == LOW) && (n == HIGH)) {
     
     if (digitalRead(PinDT) == LOW) {
       encoderPos--;
       if ( encoderPos < 0 ) {
         encoderPos = nbPas;
         digitalWrite(BuzzPin, HIGH);
         delay(50);
         digitalWrite(BuzzPin, LOW);
         delay(50);
         digitalWrite(BuzzPin, HIGH);
         delay(50);
         digitalWrite(BuzzPin, LOW);
       }
       lcd.setCursor(7, 1);
       lcd.print("   ");
       lcd.setCursor(7, 1);
       lcd.print(encoderPos);
       myservo.write(encoderPos);
     } else {
       encoderPos++;
       if ( encoderPos == (nbPas+1)) {
         encoderPos = 0;
         digitalWrite(BuzzPin, HIGH);
         delay(50);
         digitalWrite(BuzzPin, LOW);
         delay(50);
         digitalWrite(BuzzPin, HIGH);
         delay(50);
         digitalWrite(BuzzPin, LOW);
       }
       lcd.setCursor(7, 1);
       lcd.print("   ");
       lcd.setCursor(7, 1);
       lcd.print(encoderPos);
       myservo.write(encoderPos);
     }
   } 
   PinCLKLast = n;
}