I started to learn Arduino and make my projects a several weeks ago and finally I have some hardware arrived and did some test. I bought this display with i2c interface:
I download library LiquidCrystal_I2C GitHub - johnrickman/LiquidCrystal_I2C: LiquidCrystal Arduino library for the DFRobot I2C LCD displays and did upload examples to my Arduino Uno and change the code for correct address, which i check
Now i have just one row blocks on the screen and not the letters. Can you advise me, what I doing wrong.
here are the pictures : https://photos.app.goo.gl/CnbTFpNBTqVPWApT9