#include <LiquidCrystal.h>
#define rs PB11
#define en PA12
#define d4 PA7
#define d5 PA4
#define d6 PA5
#define d7 PA6
const int clockPin = 9;
const int rotation = 20;
long bit_inc = 0, counter;
String counter_s;
float RPM = 0.0;
int en1 = 0, en2 = 0, en3 = 0;
unsigned long current, previous;
const long interval = 2000;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  lcd.begin(16, 2);
  pinMode(clockPin, INPUT);
  current = millis();
  previous = millis();
  delay(1000);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  // lcd.setCursor(0, 0);
  // lcd.print("ADC:");
  // int analog = analogRead(A0);
  // String adc = String(analog);
  // lcd.print(adc);
  // lcd.print("   ");
  current = millis();
  if (current - previous >= interval){
    previous = millis();
    // Serial.println("bit_inc for 2 sec: " + String(bit_inc));
    bit_inc = bit_inc *30;
    // Serial.println("bit_inc for 1 min: " + String(bit_inc));
    RPM = bit_inc/rotation;
    Serial.println("Counter: " + String(counter));
    Serial.println("RPM: " + String(RPM));
    lcd.setCursor(0, 1);
    lcd.print("RPM: ");
    lcd.setCursor(5, 1);
    lcd.print(RPM);
    bit_inc = 0;
  }
  if (digitalRead(clockPin) == 0 and en1 == 1){
    en1 = 0;
    bit_inc++;
  } 
  if (digitalRead(clockPin) == 1 and en1 == 0){
    en1 = 1;
  }
  delay(10); // this speeds up the simulation
}