/*  Program Tacho Meter  dengan Incremental Encoder
Jalankan program dan simulasikan dengan mengClick tanda putar kiri
 pada sensor sebanyak 5 kali, tunggu hingga tampil 300rpm (5x60) dan 
 Arah ke kanan.
 Tunggu hingga tampil Tacho Meter
Click tanda putar kiri 3 kali, tunggu hingga tampil 180 rpm dan arah kiri 
*/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int signalPin = 34;   // Clock connected here
const int DTPin = 32;   // DT connected here
const int SWPin = 14;   // SW connected here
volatile unsigned long pulseCount = 0;
bool Arah;
unsigned long previousMillis = 0;
const long interval = 1000;  // 1 second

// Interrupt function
void IRAM_ATTR countPulse() {
  pulseCount++;
  Arah=digitalRead(DTPin);
}

void setup() {
  Serial.begin(9600); 
  lcd.init();
  lcd.backlight();
  pinMode(signalPin, INPUT);
  pinMode(DTPin, INPUT);
  pinMode(SWPin, INPUT);
  lcd.setCursor(2,0);
  lcd.print("TACHO METER");
  attachInterrupt(digitalPinToInterrupt(signalPin), countPulse, RISING);
  previousMillis = millis();
}

void loop() {
  attachInterrupt(digitalPinToInterrupt(signalPin), countPulse, RISING);
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    detachInterrupt(digitalPinToInterrupt(signalPin));
   unsigned long rpm = pulseCount * 60;
pulseCount = 0;
previousMillis = currentMillis;
lcd.clear();
if (rpm!=0){
 lcd.setCursor(0, 0);
 lcd.print("RPM:");
 lcd.setCursor(0, 1);
 lcd.print(rpm);
 Serial.print("Arah =");
  lcd.setCursor(8,0);
  lcd.print("Arah :");
if (Arah==HIGH) {
  lcd.setCursor(8,1);
  lcd.print("Kiri");
  Serial.println("Kiri");}
  else if (Arah==LOW){
    lcd.setCursor(8,1);
    lcd.print("Kanan");
   Serial.println("Kanan");
  }
}
else if (rpm==0 ) {
  lcd.clear();
  lcd.setCursor(2,0);
  lcd.print("TACHO METER");} 
  pulseCount = 0;
 //noInterrupts();
unsigned long pulses = pulseCount;
//interrupts();
 }
}