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

OFFLINE

MASTER CODE:

#include//header file for i2c
void setup()
{
Serial.begin(9600);//to view the serial monitor
Wire.begin();//to enable i2c
pinMode(A0,INPUT);//ouput for A0


}

void loop()
{

float x=analogRead(A0);//to read analog input A0
float value=((x*5)/1024);
signed int temp=((value-0.5)*100);//value for temperature
Wire.beginTransmission(8);//transmit for start
Wire.write(temp);//write the temp value
Wire.endTransmission();//transmit for end

delay(1000);//delay for 1sec
}

SLAVE CODE:

#include//header file for i2c
#include//header file for lcd

void setup()
{
LiquidCrystal lcd(12,11,5,4,3,2);//define lcd module pin RS,E,DB4,DB5,DB6,DB7
lcd.begin(16,2);//initialize lcd display

Serial.begin(9600);//to view serial monitor
Wire.begin(8);//to enable the i2c
Wire.onReceive(display);//function call when slave receive the signal
}

void loop()
{

delay(30); // Wait for 1000 millisecond(s)


}
void display(int x)
{
LiquidCrystal lcd(12,11,5,4,3,2);//define lcd module pin RS,E,DB4,DB5,DB6,DB7
int y=Wire.read();//the value for temp
Serial.println(y);//to view the serial monitor value of y
lcd.setCursor(0,0);//set cursor at first line of lcd
lcd.print("the volt is");//to dispaly the lcd
lcd.print(y);//to display the value of y
delay(1000);//delay for 1sec
}