I2C LCD Display - MohanadSinan/IoT-Based-Healthcare-System GitHub Wiki

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  lcd.backlight();                //To Power ON /OFF the back light
}


void loop()
{
  lcd.init();                     // initialize the lcd 

  // Print a message to the LCD.
  lcd.setCursor(2,0);             //Defining positon to write from third row,first column .
  lcd.print("Hello, world!");     //You can write 16 Characters per line within quotations.
  
  delay(4000);                    // waits for 4 seconds
  lcd.clear();                    //Clean the screen
  
  lcd.setCursor(3,0);             //Defining positon to write from fourth row,first column .
  lcd.print("My name is");
  lcd.setCursor(4,1);             //Defining positon to write from fifth row,second column .
  lcd.print("Arduino!");
  
  delay(4000);                    // waits for 4 seconds

}

// i2c_scanner

#include <Wire.h>


void setup()
{
  Wire.begin();

  Serial.begin(9600);
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
}


void loop()
{
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++ ) 
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4) 
    {
      Serial.print("Unknown error at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(5000);           // wait 5 seconds for next scan
}