//#include<Wire.h>
#include<LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16 ,2);

int rst = 7;
int rststate = 0;
int svalue = 150;
int c = 0;
int i = 0;
int pd1 = A0;
int pd2 = A1;
int pv1, pv2;
unsigned long t1, t2;

float fps, afps, sum = 0.0, totime;
float x[50];
void setup()
{
  
  pinMode(rst,INPUT);
  pinMode(pd1,INPUT);
  pinMode(pd2,INPUT);

  lcd.init();
  lcd.backlight();

  lcd.clear();
 
  lcd.setCursor(0,0);
  lcd.print("A = ");
  lcd.setCursor(4,0);
  lcd.print(afps, 2);
  lcd.print(" fps");
  
  lcd.setCursor(14,0);
  lcd.print(c, 10);
    
  lcd.setCursor(0,1);
  lcd.print("V = ");
  lcd.setCursor(4,1);
  lcd.print(fps,2);
  lcd.print(" fps");
  lcd.setCursor(0,0);
 }


void loop()
{
  rststate = digitalRead(rst);
 
 if(rststate == HIGH)
{
  
  fps = 1.0;
  afps = 1.0;
  sum = 1.0;
  totime = 1.0;
  c = 1;
  lcd.clear();
 
  lcd.setCursor(0,0);
  lcd.print("A = ");
  lcd.setCursor(4,0);
  lcd.print(afps, 2);
  lcd.print(" fps");
  
  lcd.setCursor(14,0);
  lcd.print(c, 10);
    
  lcd.setCursor(0,1);
  lcd.print("V = ");
  lcd.setCursor(4,1);
  lcd.print(fps,2);
  lcd.print(" fps");
  lcd.setCursor(0,0);
   }




  
    pv1=analogRead(pd1);
    if(pv1<=svalue)
    {
       t1=micros();
       }
    
    pv2=analogRead(pd2);
    if(pv2<=svalue)
    {
       t2=micros();
       }

  
  if(pv1<=svalue && pv2<=svalue)
  {
   totime = t2 - t1;
  
  fps = 357611 / totime;      //when distance between two sensors is 10.9 cm/ 0.357611 feet (distance between two sensors in feet and totime in seconds)

  c = c + 1;
   
  x[c-1] = fps ;

  sum = sum + x[c-1]; 

  afps = sum / c;

  lcd.clear();
 
  lcd.setCursor(0,0);
  lcd.print("A = ");
  lcd.setCursor(4,0);
  lcd.print(afps, 2);
  lcd.print(" fps");
  
  lcd.setCursor(14,0);
  lcd.print(c, 10);
    
  lcd.setCursor(0,1);
  lcd.print("V = ");
  lcd.setCursor(4,1);
  lcd.print(fps,2);
  lcd.print(" fps");
  }
    
  }