Project 1 - Interfacing a 16*2 LCD with Arduino using I2C protocol

/* MASTER CODE */

#include<Wire.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd(2,7,8,9,10,11);
void setup()
{
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("Skill Lync");
lcd.setCursor(0,1);
lcd.print("I2C A to A");
for(int i=0;i<16;i++){
lcd.scrollDisplayLeft();
delay(100);
}
delay(2000);
lcd.clear();
Serial.begin(9600);
Wire.begin();
}

void loop()
{
Wire.requestFrom(9,1);
byte MasterReceive = Wire.read();
int potvalue = analogRead (A0);
byte MasterSend = map(potvalue, 0, 1023,0,127);
Wire.beginTransmission (9);
Wire.write(MasterSend);
Wire.endTransmission();
lcd.setCursor(0,0);
lcd.print(">> the Master <<");
lcd.setCursor (0,1);
lcd.print("SlaveVal: ");
lcd.print(MasterReceive);
Serial.println("Master Received From Slave");
Serial.println(MasterReceive);
delay(500);

}

/* SLAVE CODE*/

#include<Wire.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd(2,7,8,9,10,11);
byte SlaveReceived=0;

void setup()
{
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("skill lync");
lcd.setCursor (0,1);
lcd.print("12C 2 ARDUINO");
delay(5000);
lcd.clear();
Serial.begin(9600);
Wire.begin(9);
Wire.onReceive(receiveEvent);
Wire.onRequest (requestEvent);
}

void loop(void)
{
lcd.setCursor(0,0);
lcd.print (">> the Slave <<<");
lcd.setCursor(0,1);
lcd.print ("MasterVal:");
lcd.print (SlaveReceived);
Serial.println("Slave Received From Master");
Serial.println(SlaveReceived);
delay(500);
lcd.clear();
}
void receiveEvent(int howMany)
{
SlaveReceived=Wire.read();
}
void requestEvent()
{
int potvalue = analogRead(A0);
byte SlaveSend = map(potvalue, 0, 1023, 0, 127);
Wire.write(SlaveSend);
}