#define sensor A1 // Sharp IR GP2Y0A41SK0F (4-30cm, analog)
#include <LiquidCrystal.h>
//LCD pin to Arduino
const int pin_RS = 8;
const int pin_EN = 9;
const int pin_d4 = 4;
const int pin_d5 = 5;
const int pin_d6 = 6;
const int pin_d7 = 7;
const int pin_BL = 10;

char buff[50];

LiquidCrystal lcd( pin_RS,  pin_EN,  pin_d4,  pin_d5,  pin_d6,  pin_d7);
void setup() {
  Serial.begin(9600); // start the serial port
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
}

void loop() {
  float volts = analogRead(sensor) * 0.0048828125; // value from sensor * (5/1024)
  int distance = 13 * pow(volts, -1); // worked out from datasheet graph
  lcd.setCursor(2, 0);
  lcd.print("GP2Y0A41SK0F");
  if (distance <= 30)
  {
    lcd.setCursor(0, 1);
    sprintf(buff, "Distance: %dcm", distance);
    Serial.println(buff);   // print the distance
    lcd.print(buff);
  }
  else {
    Serial.println("OUT OF RANGE");
    lcd.setCursor(2, 1);
    lcd.print("OUT OF RANGE");
  }
  delay(500);
  lcd.clear();
}