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

Overview of the Project:

In this project implementing the Code for “Interfacing a 16*2 LCD with two Arduino’s (one for Master and one for Slave) using Inter-Integrated Circuit (I2C) communication protocol” by sending the message to LCD using I2C communication protocol and displaying the message on the LCD screen.

Goals:

• Communication between Arduino and 16*2 LCD using I2C protocol.
• Displaying the message sent by Master and received by slave i.e. LCD.

Key Highlights of the Project:

• Using the inter-integrated circuit communication protocol, transferring the data i.e. the message we want to display is sent to the LCD.
• Two Arduino’s are connected to the LCD display and the communication is executed using the I2C protocol between Arduino and the LDC display.

Deliverables of this project:

• Communication between the Arduino’s and LCD using I2C.
• The message passed from master to slave and displayed on the 16*2 LCD.

Expected Outcomes:

• Students will get the Knowledge of I2C communication Protocol and the Arduino.
• The Hardware connection of all components used in this project.
• Displaying the message sent by master (Arduino) and received by the slave (16*2 LCD display).

Component used:

Name	Quantity	Component
UMaster USlave	2	Arduino Uno R3
U4 U2	2	LCD 16 x 2
Rpot2	1	250 kΩ Potentiometer
R4 R1	2	1 kΩ Resistor

Schematic View:

Block diagram:

Program:

//master

#include <Wire.h>

#include <LiquidCrystal.h>

LiquidCrystal lcd(11, 12, 2, 3, 4, 5);

void setup()

{

Wire.begin();

lcd.begin(16, 2);

Serial.begin(9600);

}

void loop()

{

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(">> Master <<"); //Prints >> Master << at LCD

lcd.setCursor(0,1); //Sets Cursor at line two of LCD

lcd.print("MasterSendVal:"); //Prints SlaveVal: in LCD

lcd.print(MasterSend); //Prints MasterReceive in LCD received from Slave

delay(500);

lcd.clear();

}

//slave

#include <Wire.h>

#include <LiquidCrystal.h>

byte SlaveReceived=0;

LiquidCrystal lcd(11, 12, 2, 3, 4, 5);

void setup()

{

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

lcd.begin(16, 2); //Initilize LCD display

Serial.begin(9600);//Begins Serial Communication at 9600 baud rate

Wire.onReceive(receiveEvent);// function call slave receive value from master

}

void loop(void)

{

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

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

lcd.setCursor(0,1); //Sets Cursor at line two of LCD

lcd.print("MasterVal:"); //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 the Slave receives value from the master

{

SlaveReceived = Wire.read(); //Used to read value received from master and store in variable SlaveReceived

}

Output:

the potentiometer value is conceded to the master message. Master sent to the slave and then receive value to print in LCD