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

//OFFLINE

//MASTER
#include<Wire.h>

void setup()
{
pinMode(A2, INPUT);
Serial.begin(9600);
Wire.begin(3); //transmission starts from ther master

}

void loop()
{
float value=analogRead(A2);
signed int voltage=(value*5)/1024;

Wire.beginTransmission(1);
Wire.write(voltage);
Wire.endTransmission();
delay(50);
}

//SLAVE
#include<Wire.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);
void setup()
{
Serial.begin(9600);
Wire.begin(1);
Wire.onReceive(LCD);
lcd.begin(16,2);
}
void loop()
{
delay(50);
}

void LCD(int y)
{

signed int voltage=Wire.read();
lcd.setCursor(0,0);
lcd.print("voltage is : ");

lcd.print(voltage);
Serial.print("PD voltage value is\n"); // here we displaying output in the serial monitor
Serial.println(voltage);
delay(1000);

}