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

OFFLINE :

# 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(display);
lcd.begin(16,2);

}
void loop()
{
delay(1000);
}

void display(int y)
{

signed int voltage = Wire.read();
lcd.setCursor(0,0);
lcd.print("the output is: ");
lcd.println(voltage);
Serial.print("the output is: ");
Serial.println(voltage);
delay(1000);
}

# MASTER

#include<Wire.h>
void setup()
{
Serial.begin(9600);
Wire.begin();
pinMode(A0,INPUT);

}
void loop()
{
float value = analogRead(A0);
signed int voltage= (5*value)/1024;
Wire.beginTransmission(1);
Wire.write(voltage);
Wire.endTransmission();
delay(1000);
}