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

Interfacing a 16*2 LCD with Arduino using I2C protocol

// MASTER CODE

#include<Wire.h> //library for i2c communication functions
#include<LiquidCrystal.h> //library for lcd display functions
LiquidCrystal lcd(2,7, 8, 9, 10, 11);//defined lcd module pins (RS,EN,D4,D5,D6,D6)
void setup()
{
lcd.begin(16,2); //Initilize LCD display
lcd.setCursor(0,0);//Sets Cursor at first line of Display
lcd.print("SKILL-LYNC");//Prints SKILL-LYNC in LCD
lcd.setCursor(0,1);//Sets Cursor at second line of Display
lcd.print("I2C ARDUINO 2 ARDUINO");//Prints I2C ARDUINO in LCD
for(int i = 0; i<=16; i++)
{
lcd.scrollDisplayRight();
delay(100);
}
delay(2000);
lcd.clear(); //Clears LCD display
Serial.begin(9600); //Begins Serial Communication at 9600 baud rate
Wire.begin(); //Begins I2C communication at pin (A4,A5)
}

void loop()
{
Wire.requestFrom(8,1);// request 1 byte from slave arduino (8)

byte MasterReceive = Wire.read(); // receive a byte from the slave arduino and store in MasterReceive

int potvalue = analogRead(A0); // Reads analog value from POT (0-5V)

byte MasterSend = map(potvalue,0,1023,0,127); //Convert digital value (0 to 1023) to (0 to 127)
Wire.beginTransmission(8);// start transmit to slave arduino (8)
Wire.write(MasterSend);// sends one byte converted POT value to slave
Wire.endTransmission(); // stop transmitting
lcd.setCursor(0,0);//Sets Currsor at line one of LCD
lcd.print(">> THE MASTER <<"); //Prints >> Master << at LCD
lcd.setCursor(0,1);//Sets Cursor at line two of LCD
lcd.print("Slave Value:");//Prints SlaveVal: in LCD
lcd.print(MasterReceive);//Prints MasterReceive in LCD received from Slave

Serial.println("Master receive from slave");
Serial.println(MasterReceive);//Prints in Serial Monitor
delay(500);
}

// SLAVE CODE
#include<Wire.h>//Library for I2C Communication functions
#include<LiquidCrystal.h>//Library for LCD display function
LiquidCrystal lcd(2,7,8, 9, 10, 11);//Define LCD Module Pins (RS,EN,D4,D5,D6,D7)
byte SlaveReceived = 0;
void setup()
{
lcd.begin(16,2);//Initilize LCD display
lcd.setCursor(0,0);//Sets Cursor at first line of Display
lcd.print("SKILL-LYNC");//Prints SKILL-LYNC in LCD
lcd.setCursor(0,1);//Sets Cursor at second line of Display
lcd.print("I2C 2 ARDUINO");//Prints I2C ARDUINO in LCD

delay(5000);
lcd.clear();//Clears LCD display
Serial.begin(9600);//Begins Serial Communication at 9600 baud rate

Wire.begin(8);//Begins I2C communication with Slave Address as 8 at pin (A4,A5)

Wire.onReceive(receiveEvent);//Function call when Slave receives value from master
Wire.onRequest(requestEvent);//Function call when Master request value from Slave

}

void loop()
{
lcd.setCursor(0,0); //Sets Currsor at line one of LCD

lcd.print(">> THE SLAVE <<");//Prints >> Slave << at LCD

lcd.setCursor(0,1);//Sets Cursor at line two of LCD
lcd.print("Master Value : "); //Prints MasterVal: in LCD
lcd.print(SlaveReceived);//Prints SlaveReceived value in LCD received from Master
Serial.println("Slave received from master"); //Prints in Serial Monitor

Serial.println(SlaveReceived);
delay(500);
lcd.clear();
}

void receiveEvent(int howMany)//This Function is called when Slave receives value from master//Used to read value received from master and store in variable SlaveReceived
{
SlaveReceived = Wire.read();//Used to read value received from master and store in variable SlaveReceived
}
void requestEvent()//This Function is called when Master wants value from slave
{
int potvalue = analogRead(A0);// Reads analog value from POT (0-5V)

byte SlaveSend = map(potvalue,0,1023,0,127); // Convert potvalue digital value (0 to 1023) to (0 to 127)
Wire.write(SlaveSend);// sends one byte converted POT value to master
}