Hi guys,,, I found the problem on HD44780 (16x2) display via I2C with a PCF8574AP.
when I uploaded the example sketch, there are a few problems. The first line is filled with black boxes.
I'm not able to print text on the display.
is there any solution ??
I use this code
LiquidCrystal_I2C lcd(0x38,16,2); // set the LCD address to 0x20 for a 16 chars and 2 line display
lcd.init(); // initialize the lcd
// Print a message to the LCD.
I use this schematic