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 Arduino 2 Arduino");
for(int i=0;i<16;i++)
{
lcd.scrollDisplayLeft();
delay(100);

// Print a message to the LCD.
//lcd_1.print("hello world!");
}
delay(2000);
lcd.clear();
Serial.begin(9600);
Wire.begin();
}

void loop()
{
Wire.requestFrom(8,1);
byte MasterReceive=Wire.read();
int potvalue=analogRead(A0);
byte MasterSend=map(potvalue, 0,1023,0,127);
Wire.beginTransmission(8);
Wire.write(MasterSend);
Wire.endTransmission();

// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting
// begins with 0):
lcd.setCursor(0, 0);
// print the number of seconds since reset:
lcd.print(">> THE MASTER >>");
lcd.setCursor(0, 1);
lcd.print( MasterReceive);
Serial.println("Master received from slave");
Serial.println(MasterReceive);

delay(500); // Wait for 1000 millisecond(s)
}

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);// Set up the number of columns and rows on the LCD.

// Print a message to the LCD.
lcd.print("skill lync");
lcd.setCursor(0, 1);
lcd.print("I2C 2 Arduino");
delay(500);
lcd.clear();
Serial.begin(9600);
Wire.begin(8);
Wire.onReceive(receiveEvent);
Wire.onRequest(requestEvent);
}

void loop()
{
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting
// begins with 0):
lcd.setCursor(0, 0);
lcd.print(">> THE slave >>");
lcd.setCursor(0, 1);
lcd.print("Master Value:");
lcd.print(SlaveReceived);
Serial.println("Slave received from Master");
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);
}