![]() Run the diagnostic sketch and post the results. In the examples, there is a diagnostic sketch that will help us to help you if you still have trouble with the display. The nice thing about the hd44780 library is that it will autodetect the I2C address and the I2C backpack to LCD pin mapping. There are examples to show how to use the library. The class that you want to use is the hd44780_I2Cexp class. Select and install the hd44780 library by Bill Perry. 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. The library is available in the Library Manager. ![]() The hd44780 library is the best available for I2C LCDs. 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. If the library default settings for either or both are not correct the LCD will not work. I can make the backlight flash but printing text just results in blocks.Īny help greatly appreciated, i've been tinkering with this for nearly 8 hoursįor an I2C LCD display to work, the I2C address and the I2C backpack to LCD pin mapping must be correct. I'm wondering if my instance of an lcd has the right parameter values but the module i bought has no info or even brand name (unless it's under the I2C module that piggybacks onto the LCD!), so all i've changed is the address. Since the scanner program fetched an address the wiring must be correct? I've quadruple-checked it, it's simple wiring and no mistakes there. I've turned the contrast up and down and still only blocks. I then run this code : // I2C LCD Hello World I've attached a 1602 I2C LCD display to an Uno, ran the I2CScanner program and found that the address is 0x3F.
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