Hello, I have a backlight enabled LCD that I'm using together with the PCF8574. The wiring and schematics is the same as found in this tutorial from Garagelab, the only difference is the 10k potentiometer that I simply change to a resistor.As in the tutorial, I'm using the LiquidCrystal_I2C library found here. I've noticed that the library has some control for the backlight, however I'm not being able to use it (it changes nothing), am I missing some wiring? Or it may be another problem?The function I'm talking about is the setBacklight(val), it changes nothing.I do believe that the setContrast(val) wouldn't change anything as well, since I'm connecting the contrast pin directly on the GND with a resistor, however I haven't tested it.Thanks for the help!
Something like this?If yes, how do I set up the Backlight pin on the PCF8574P? Or is it the 7th pin as default?Thanks.
Well, unfortunately, nothing I did actually worked! Even taking the pins 15 and 16 off (completely unwiring them on the protoboard) led me no were, the backlight was still on! I'm beginning to think they may be fixed on the pins 1 and 2, since I got this LCD screen already soldered, I mean, I should completely turn the backlight off if I simply got rid of the wires on pin 16 and 15 right?