LCD mit I2C

LCD mit I2C

Der Vorteil eines I2C-Moduls liegt klar auf der Hand… 2 statt 5 Kabel, somit sind mehr Pins frei.
Will man mehr als ein LCD ansteuern, kein Problem….. es bleiben 2 Kabel 🙂

Board I2C an pin:
Uno, Nano, Ethernet A4 (SDA), A5 (SCL)
Mega2560 20 (SDA), 21 (SCL)
Leonardo 2 (SDA), 3 (SCL)
Due 20 (SDA), 21 (SCL), SDA1, SCL1

#include 
#include 

LiquidCrystal_I2C lcd1(0x27,2,1,0,4,5,6,7); // 0x27 is the I2C bus address for an unmodified backpack
LiquidCrystal_I2C lcd2(0x20,2,1,0,4,5,6,7); // 0x27 is the I2C bus address for an unmodified backpack

void setup()
{
  // activate LCD 1 module
  lcd1.begin (16,2); // for 16 x 2 LCD module
  lcd1.setBacklightPin(3,POSITIVE);
  lcd1.setBacklight(HIGH);

  // activate LCD 2 module
  lcd2.begin (16,2); // for 16 x 2 LCD module
  lcd2.setBacklightPin(3,POSITIVE);
  lcd2.setBacklight(HIGH);
}

void loop()
{
  lcd1.home (); // set cursor to 0,0
  lcd2.home (); // set cursor to 0,0

  lcd1.print("LCD 1"); 
  lcd2.print("LCD 2");

  lcd1.setCursor (0,1);        // go to start of 2nd line
  lcd1.print(millis());
  lcd2.setCursor (0,1);
  lcd2.print(millis());
  delay(1000);
}