osepp lcd display 16x2 quotation

It"s 16x2, i"ve written some code to print out text but the only thing that appears is the top row filled with boxes and the bottom row showing nothing..

I"ve read another forum talking about setting the LCD baud rate to my serial monitor rate, but i"m not sure how to do any of that. this is the product i bought: OSEPP - Multi Colored LED Assortment Set

My normal answer would be that you can use any available Arduino I/O pin for any of the LCD control or signal lines, but that is only true when you are doing the wiring between the two devices.

In this case the original poster did not tell us that he was using a shield. In that case the wiring between the two devices has already been done and your constructor (LiquidCrystal lcd(...)) must match that wiring.

The Displaytech 162GCOG series is a lineup of 16x2 character chip-on-glass LCD modules. These modules have an 65x27.7 mm outer dimension with 61x15.7 mm viewing area on the display. The 162GCOG 16x2 LCD display series has the controller mounted directly onto the LCD glass. The chip-on-glass (COG) technology allows for a cost-effective system build since the display does not require a PCB. Get a quote directly from Displaytech for the 16x2 COG character LCD display from the 162GCOG series.

What is the purpose of declaring LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); if we are using pins A4 and A5? I know that 0x27 is the ic address but what is the rest for?

I am getting a error while i m going to add zip file of lcd library error id this zip file does not contains a valid library please help me to resolve this issue as soon as possible.....

Hey guys. My LCD works fine using the above instructions (when replacing the existing LCD library in the Arduino directory) but I can"t get the backlight to ever switch off. Suggestions?