LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);```
hello please need help
(positive not declared in this scope ) that is what I already got any advice, please
Your code is for a different LiquidCrystal_I2C library than the code was written for.
There are several libraries with the name LiquidCrystal_I2C. The are not all the same and code from 1 may not run in another. Those LiquidCrystal_I2C libraries are old and most are not maintained. The newest and best library for I2C LCD with the hd44780 controller (1602, 2004) is the hd44780 library by Bill Perry. The library is available via the IDE library manager.
For an I2C LCD display to work, the I2C address and the I2C backpack to LCD pin mapping must be correct. If the library default settings for either or both are not correct the LCD will not work. You can try to figure out the right pin mapping and use an I2C scanner to find the address, but if you install and use the hd44780 library that is done automatically by the library.
To install the hd44780 library. The hd44780 library is the best available for I2C LCDs. The library is available in the Library Manager. Go to Library Manager (in the IDE menus, Sketch, Include Libraries, Manage Libraries) and in the Topics dropdown choose Display and in the Filter your search box enter hd44780. Select and install the hd44780 library by Bill Perry.
The class that you want to use is the hd44780_I2Cexp class. There are examples to show how to use the library. The nice thing about the hd44780 library is that it will autodetect the I2C address and the I2C backpack to LCD pin mapping.
In the examples, there is a diagnostic sketch that will help us to help you if you still have trouble with the display. Run the diagnostic sketch and post the results.
The contrast pot on the I2C backpack may need to be adjusted for the display to be visible and readable.
see this:
and that:
and finally, please edit your post title and move it to a more appropriate section like
Using Arduino / Displays
Maybe this works with your library?
const int i2c_addr = 0x27;
// const int i2c_addr = 0x3F;
LiquidCrystal_I2C lcd(i2c_addr, 16, 2);