//Frequenzimetro by Xfox

#include <LiquidCrystal.h>
const int in = A0;
const int out = 3;
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);


long tempo1 = 0;
long tempo2 = 0;

double T = 0;
double f = 0;

long wait = 0;

void setup() {
  Serial.begin(19200);
  lcd.begin(16, 2);
  pinMode(in, INPUT);
  pinMode(out, OUTPUT);
  Serial.println("Start");
  splashscreen();
  mostra();
}

void loop(){
  if (digitalRead(in) == LOW){
    tempo1 = millis();
    for (digitalRead(in); digitalRead(in) != HIGH; ){
    }
    tempo2 = millis();
  }


  T = tempo2 - tempo1;
  T = T * 0.001;
  f = 1 / T;
  mostra();
  seriale();
}


void mostra(){
  if (wait < millis()){
    wait = millis() + 50;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("f: ");

    if (f > 1000){
      f = f / 1000;
      lcd.print(f);
      lcd.print(" KHz");
    }
    else{
      lcd.print(f);
      lcd.print(" Hz");
    }
    lcd.setCursor(0,1);

    if (T < 0.001){
      T = T * 1000;
      lcd.print("T: ");
      lcd.print(T);
      lcd.print(" ms");
    }
    else{
      lcd.print("T: ");
      lcd.print(T);
      lcd.print(" s");
    }
  }
}

long wait_seriale = 0;
void seriale(){

  if (wait_seriale < millis()){
    wait_seriale = millis() + 1000;
    Serial.print("T = ");
    Serial.print(T);
    Serial.print("\t");
    Serial.print("T2 = ");
    Serial.print(tempo2);
    Serial.print("\t");
    Serial.print("T1 = ");
    Serial.print(tempo1);
    Serial.print("\t");
    Serial.print("f = ");
    Serial.print(f);
    Serial.print("\t");
    Serial.println();
  }
}

void splashscreen(){
  lcd.clear();
  lcd.print("Xfox & Arduino");
  lcd.setCursor(0, 1);
  lcd.print("Frequency");
  delay(2000);
}