start.cpp

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#include <Arduino.h>
#include "LiquidCrystal.h"      
//#define DEBUG_LCD
#include "_debug.h"
#include "Wire.h"
#include "twi.h"        // required by Wire.h

#define SA 4
//SA ... Slave Address

void receiveEvent(int); //prototype
LiquidCrystal lcd(8, 9, 4, 5,6, 7); //setup Display
void setup() {
    Wire.begin(SA);                // join i2c bus as slave with address #4
    Wire.onReceive(receiveEvent); // register event
    lcd.begin(16,2);    
}

void loop() {
    delay(100);
}

void receiveEvent(int howMany) {
    lcd.clear();    //clear display
    while (1 < Wire.available()) { // loop through all but the last
        char c = Wire.read(); // receive byte as a character
        lcd.print(c); // print the character
    }
    int x = Wire.read();    // receive byte as an integer
    lcd.print(x);         // print the integer
}