Week 11 – Arduino libraries and displays

During this second week with Ian we learned how to use libraries and displays on Arduino. First of all Ian gived us two documents to install, one was the library and the other one was the code.

I don’t know why on my computer the code wasn’t working, so i just tried to install another LiquidCrystal_I2C.h library and i changed the code by myself, then i added the library to the Arduino environment.

Below the modified code.

• /*
  20 character 4 line I2C Display
  Backpack Interface labelled “YwRobot Arduino LCM1602 IIC V1”
  Connections:-
  Vcc to 5V (Red)
  Ground (Gnd) to Ground (Gnd) (Black)
  SDA to A4 (Blue)
  SCL to A5 (yellow)
  *//*—–( Import needed libraries )—–*/
  #include <Wire.h> // Comes with Arduino IDE
  // Get the LCD I2C Library here:
  // https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads

  #include <LiquidCrystal_I2C.h>

  // set the LCD address to 0x27 for a 20 chars 4 line display
  // Set the pins on the I2C chip used for LCD connections:
  // addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
  LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address

  void setup() /*—-( SETUP: RUNS ONCE )—-*/
  {
  lcd.begin(20,4); // initialize the lcd for 20 chars 4 lines, turn on backlight
  }/*–(end setup )—*/

  void loop() /*—-( LOOP: RUNS CONSTANTLY )—-*/
  { //–(Start of main loop)—

  //——– Write characters on the display ——————
  // NOTE: Cursor Position: Lines and Characters start at 0
  // lcd.setCursor(Horizontal position,Line)

  lcd.clear(); //Clears the screen.
  delay(1000);
  lcd.setCursor(4,0); //Start at character 4 on line 0
  lcd.print(“University of”);
  delay(1000);
  lcd.setCursor(6,1); //Next start at character 6 on line 1
  lcd.print(“Brighton”);
  delay(1000);
  lcd.setCursor(4,2);
  lcd.print(“Hello World!”);
  delay(1000);
  lcd.setCursor(0,3);
  lcd.print(“20 by 4 Line Display”);
  delay(2000);

  }// –(end main loop )–

After the library is installed you have to include it in the sketch as shown in the picture.

Then i had to connect the LCD display.

1. Black Gnd    to         Gnd

2. Red +5V       to         Vcc

3. Blue SDA      to         A4

4. Yellow SCL   to         A5

I had to adjust the contrast of the screen using the blue trimming tool.

I didn’t understand immediately how the display line worked, so these are some initial errors.

I finally achieved what Ian was asking us.

I just had some extra fun with it adding some Italian words from my dialect.

“Adda passà ‘a nuttata” that translated means “the bad night will end” a famous quotation from one of the most important Neapolitan minds, Eduardo De Filippo.