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

CODE:

MASTER:

//MASTER

//SLAVE  address-4

///MASTER CODE

#include<Wire.h>
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() 
{
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  lcd.clear();
  Serial.begin(9600);
  Wire.begin();
}

void loop() 
{
 
  
  Wire.requestFrom(4,1);
  float MasterReceive2 = Wire.read();
  MasterReceive2 = (MasterReceive2*3.928)-47.857;
  
  lcd.setCursor(0,0);
  lcd.print(">>MASTER<<");
  lcd.print("S1: ");
  lcd.setCursor(0,1);
  lcd.print(MasterReceive2);
  lcd.print(" Cel");
 
  
  //lcd.
  delay(500);
  
  int temp = analogRead(A0);
  byte MasterSend = map(temp,0,1023,0,127);
  Wire.beginTransmission(4);
  Wire.write(MasterSend);
  Wire.endTransmission(4);
  Serial.print("Master Sent  value ");
  Serial.println((MasterSend*3.928)-47.857);

  
}
 

SLAVE:

//SLAVE 2 address -4
#include <Wire.h>
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

byte SlaveSend2 = 0;
byte SlaveReceived = 0;

void setup() 
{
  lcd.begin(16, 2);
  lcd.clear();
  Serial.begin(9600);
  Wire.begin(4);
  Wire.onRequest(requestEvent);
  Wire.onReceive(receiveEvent);
}

void loop()
{
  float SlaveReceived1 = (SlaveReceived*3.928)-47.857;
   lcd.setCursor(0,0);
  lcd.print(">>SLAVE<< M: ");
  lcd.setCursor(0,1);
  lcd.print(SlaveReceived1);
  lcd.print(" Cel");
  
  delay(500);
}

void requestEvent ()
{
 int potvalue = analogRead(A0);
  byte SlaveSend2 = map(potvalue,0,1023,0,127);
  Wire.write(SlaveSend2); 
  Serial.print("Value sent by Slave: ");
  Serial.println((SlaveSend2*3.928)-47.857);
  
}
 
void receiveEvent(int num)
{
  SlaveReceived = Wire.read();
}

OUTPUT: