We are now ready to test the LCD screen. The following is the complete code that I've used to do so:
// Libraries
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SD.h>
#include <Ethernet.h>
// LCD Screen
LiquidCrystal_I2C lcd(0x27,20,4);
void setup()
{
// Initialize LCD screen
initDisplay();
}
void loop()
{
// Print message on the LCD screen
lcd.setCursor(0,0);
lcd.println("This is a test of the LCD screen!");
}
// Initialize LCD screen
void initDisplay()
{
lcd.init();
lcd.backlight();
lcd.clear();
}Let's look at the code line by line:
The first part of the code includes the libraries that we need in order to carry out this project. The four libraries that you should include are Wire.h, LiquidCrystal_I2C.h, SD.h, and Ethernet.h:
#include <Wire.h> #include <LiquidCrystal_I2C.h> #include <SD.h> #include <Ethernet.h>
Then, we declare the LCD instance. If you have used a different screen...