Quick use of LCD i2c display with Arduino:
Wiring
If you have any problem with the libraries used here’s the link to download them:
Codes:
First code to test with:
//16*2 LCD Display Code
//SurtrTech channel
//Code for displaying a message on the screen for 2s then erase the screen for 2s
#include <Wire.h> //Libraries needed #include <LCD.h> #include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 //I2C adress, you should use the code to scan the adress first (0x27) here
#define BACKLIGHT_PIN 3 // Declaring LCD Pins
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin); void setup() { lcd.begin (16,2); lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE); lcd.setBacklight(HIGH); //Lighting backlight lcd.home (); }
void loop() {
lcd.setCursor(0,0); //Setting the position where you want to start writing the message (0,0) is top left
lcd.print("SurtrTech "); //Message to display
lcd.setCursor(10,1); //Start writing on the position (10,1)
lcd.print("Hello");
delay(2000); //Display time
lcd.clear(); //Clearing the screen
delay(2000); //Blank screen time
}
Seconde code to write something on the serial monitor and see it on the screen:
//16*2 LCD Display from serial monitor
//Modified from "YourDuino.com"
//SurtrTech channel (LEBOUIHA)
//Code for displaying a message from the serial monitor
#include <Wire.h> //Libraries needed
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 //I2C adress, you should use the code to scan the adress first (0x27) here
#define BACKLIGHT_PIN 3 // Declaring LCD Pins
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
void setup() {
Serial.begin(9600); //Serial used
lcd.begin (16,2);
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH); //Lighting backlight
lcd.home ();
lcd.print("Hello");
delay(2000);
lcd.clear();
}
void loop()
{
// when characters arrive over the serial port...
if (Serial.available()) {
// wait a bit for the entire message to arrive
delay(100);
// clear the screen
lcd.clear();
// read all the available characters
while (Serial.available() > 0) {
// display each character to the LCD
lcd.write(Serial.read());
}
}
}
