I2C LCD

In this example we will interface to an I2C LCD using our MICRO:BIT. Now these I2C LCD’s consist of 2 parts usually an HD44780 16×2 LCD and an I2C backpack which connects to the LCD exposing the standard power and I2C pins.

This is a typical module you can buy, you can see the backpack which is obviously on the back of the LCD

We will now look at the connections and a simple layout

Layout

Connect the pins as follows:

 

 

 

Code

You will need an updated I2C LCD library, the original one I couldn’t get to work but this one does seem to work –

LiquidCrystal_I2C-master

You will need to import this into the IDE as usual

Now my example below required the I2C address to be changed to 0x3F, a lot of the example I have looked at are 0x27

 

[codesyntax lang=”cpp”]

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

LiquidCrystal_I2C lcd(0x3F,16,2); // set the LCD address to 0x3F for a 16 chars and 2 line display

void setup()
{
  lcd.init(); // initialize the lcd
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(0,0);
 lcd.print("Hello world");
 lcd.setCursor(1,1);
 lcd.print("MICROBIT");
 }
 
void loop()
{
  
}

[/codesyntax]

 

All going well you should see the messages in the code on your LCD display

 

Link

You can pick up one these modules for under $3

1pcs Blue Display IIC/I2C/TWI/SPI Serial Interface 1602 16X2 LCD Module