Hello,
I am using a 16x2 LCD with I2C via the PCF8574 integrated circuit connected to an Arduino UNO R3 board. The program running on the Arduino is to test displaying the text "Hola mundo" on the first line and a count of the seconds elapsed since the board was powered on the second line.
Although the LCD backlight turns on, the characters do not appear. The screen lights up, but nothing is displayed. What am I doing wrong?
Attached is the sketch in Arduino IDE for further clarification.
