#include <LiquidCrystal_I2C.h>
#define ENCODER_CLK 2
#define ENCODER_DT 3

LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD format: (I2C address, columns, rows)

int encoder0Pos = 0;  // Encoder Position variable
float actualtime = 0;  // Current time
float previoustime = 0; // The last time we incremented the RPS
const int interval = 1000; // Interval of 1 s
int RPS = 0;
volatile bool flag = false;  // need volatile descriptor due to sharing with interrupt function

void setup() {
  lcd.init();  // LCD start-up
  lcd.setCursor(2, 0);
  lcd.print("Iniciating");
  lcd.setCursor(0, 1);
  lcd.print("Encoder V04");
  delay(2000);
  lcd.clear();
  pinMode(ENCODER_DT, INPUT); 
  pinMode(ENCODER_CLK, INPUT);
  attachInterrupt(digitalPinToInterrupt(2), counters, RISING);  // Configure interrupt only for ENCODER_CLK
  Serial.begin(115200);  // Serial port start-up
}
void loop() {
  actualtime = millis(); // Start of the timer
  if (flag == true) {

    lcd.setCursor(1, 1);  // Signaling
    lcd.print(encoder0Pos);
    lcd.print(" encoder0Pos ");
    Serial.print(encoder0Pos);
    Serial.print("/");
    flag = false;
  }
  if (actualtime - previoustime >= interval) {
    lcd.setCursor(2, 2);  // Signaling
    lcd.print(RPS);
    lcd.print(" RPS");
    Serial.print(RPS);
    Serial.print("/");
    previoustime = actualtime;
  }

}
void counters() {
  flag = true;
  int dtValue = digitalRead(ENCODER_DT);
  if (dtValue == LOW) {
    encoder0Pos++; // Sens horaire
  }
  if (dtValue == HIGH) {
    encoder0Pos--; // Sens antihoraire
  }
   
  if (encoder0Pos == 24) {
    RPS++;
    encoder0Pos = 0;
  }
}