#include<Wire.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd(2, 7, 8, 9, 10, 11);

byte SlaveReceived;

void setup()
{
  Serial.begin(9600);
  Wire.begin(8);
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);
  lcd.begin(16,2);                           //Initilize LCD display
  lcd.setCursor(0,0);                        //Sets Cursor at first line of Display
  lcd.print("Peppe8o");                      //Prints Peppe8o in LCD
  lcd.setCursor(0,1);                        //Sets Cursor at second line of Display
  lcd.print("I2C 2 ARDUINO");                //Prints I2C ARDUINO in LCD
  delay(5000);                               //Delay for 5 seconds
  lcd.clear();                               //Clears LCD display
} 

void requestEvent()
{
  int potvalue = analogRead(A0);
  byte SlaveSend = map(potvalue,0,1023,0,127);
  Wire.write(SlaveSend);
}

void receiveEvent (int howMany)
{
   SlaveReceived = Wire.read();
}

void loop(void)
{
  lcd.setCursor(0,0);                              //Sets Currsor at line one of LCD
  lcd.print(">>  Slave  <<");                      //Prints >> Slave << at LCD
  lcd.setCursor(0,1);                              //Sets Cursor at line two of LCD
  lcd.print("MasterVal:");                         //Prints MasterVal: in LCD
  lcd.print(SlaveReceived);                        //Prints SlaveReceived value in LCD received from Master
  Serial.println("Slave Received From Master:");   //Prints in Serial Monitor
  Serial.println(SlaveReceived);
  delay(500);
  lcd.clear();
}