LCD I2C

Codice Arduino

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup()
{
  lcd.init(); // initialize the lcd
  lcd.backlight();
}

void loop()
{
  lcd.clear();                 // clear display
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("Arduino");        // print message at (0, 0)
  lcd.setCursor(2, 1);         // move cursor to   (2, 1)
  lcd.print("TEST LCD"); // print message at (2, 1)
  delay(2000);                 // display the above for two seconds

  lcd.clear();                  // clear display
  lcd.setCursor(3, 0);          // move cursor to   (3, 0)
  lcd.print("DIYables");        // print message at (3, 0)
  lcd.setCursor(0, 1);          // move cursor to   (0, 1)
  lcd.print("www.diyables.io"); // print message at (0, 1)
  delay(2000);                  // display the above for  two seconds
}

I2C scanner

// I2C address scanner program
#include <Wire.h>

void setup()
{
  Wire.begin();
  Serial.begin(9600);
  Serial.println("I2C Scanner");
}

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

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

  nDevices = 0;
  for(address = 1; address < 127; 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");
  else
    Serial.println("done");

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