/*This software is provided in an “AS IS” condition,NO WARRANTIES in any form apply to this software.
 picmicrolab.com 10.29.2017
***************************************************************************************************************
Basic Arduino Frequency Counter

*/
// include the library code:
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
long int Time = 0;

void setup() 
{
  // initialize I/O pins.
  pinMode(13, INPUT);  //
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
}

void loop() 
{

 for(int i = 0;i<500;i++)
 Time = Time + pulseIn(13, LOW);

  Time = Time / 501;
 
    // Turn on the display:
  lcd.display();

  lcd.print(1/(0.000001*Time*2));//
  lcd.print(" Hz ");//
  Time = 0; 
  lcd.setCursor(0, 0); // top left


}