I bought an I2C lcd display but I can't get it to work. I added the library LiquideCrystal_I2C and I connected the cables but when I lift my code nothing happens. My screen is on and the first line is filled with rectangles. Here is the code I try:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
void setup() {
lcd.init();
lcd.clear();
lcd.backlight();
lcd.setCursor(1,0);
lcd.print("Hello World");
}
void loop() {
}
I hope you can help me
Antoine Pirot
Welcome to the forum
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Have you tried adjusting the contrast pot?
After that, try running the i²c scanner sketch to confirm that 0x27 is the correct address for your display.
You wrote Hello world in Setup which will only show once startup
The things you want to loop or repeat kindly add them in void loop
this is a proof that LCD working. check A4/A5 swaping, check initial addres
thank you for all your answers but the problem was the address. It was not 0x27 but 0x3F in my case.
Thank you very much for your help.
Did you determine this by running the I2C Scanner?
For whatever reason that never works for me.
yes I found in this video.
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