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#include <LiquidCrystal_I2C.h>

#include <Time.h>
#include <TimeLib.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>


float radius = 120; //cm
float circle = (2 * radius * 3.14) / 100;  //m

float bySpeed = 0;
float ckTime = 0;  
float uckTime = 0;
float cycleTime = 0; 
float distance = 0;
float lcdDis = 0;

int count = 0; 
boolean temp = 0;

LiquidCrystal_I2C lcd(0x3f, 16, 2); 

void setup(){
  Serial.begin(9600); 
  lcd.init();
  lcd.begin(16,2);
  lcd.backlight();
  lcd.clear();    
}

void loop(){
  boolean check = digitalRead(A0);
 
  if(check == 1 && temp == 0){ 
    ckTime = millis(); 
    temp = 1; 
  }
 
  else if(check == 0 && temp == 1 && count > 5){ 
    uckTime = millis(); 
     
    cycleTime = (uckTime - ckTime) ;
  
    bySpeed = (circle / cycleTime) * 3600;
    temp = 0;
    count = 0;
    distance += circle;
  }
 
  if(check == 1){ 
    count++;
   if(count>50){
     bySpeed=0;
    }
 
  }


  lcd.setCursor(0,0);         
  lcd.print("Speed: ");
  if(bySpeed < 10){         
    lcd.print('0');
  }
  lcd.print(bySpeed);              
  lcd.print("Km/h");          
 
  lcdDis = distance /1000; 
  lcd.setCursor(0,1);         
  lcd.print("Distance: "); 
  if(lcdDis >= 100){          
    lcd.print((int)lcdDis);
  }
  else{
    lcd.print(lcdDis);              
  }           
  lcd.print("Km");          
 
  lcd.print("               ");      
  Serial.print("Speed : ");
  Serial.print(bySpeed);
  Serial.println(" km/h");           
  Serial.print("distance: ");
  Serial.print(lcdDis);




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Posted at 2017-07-28 20:47:13


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