![]() ![]() In the setup, the LCD is initiated with lcd.init() and the backlight is turned on with lcd.backlight(). SPI - for communicating with devices using the Serial Peripheral Interface (SPI) Bus. Communication Libraries for using the SPI, I2C and UART protocols. ![]() Stepper - for controlling stepper motors. LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2) // Change to (0x27,20,4) for 20x4 LCD. Robotics Libraries for controlling servo and stepper motors. Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered) You will need to change ‘lcd’ to the new name in the rest of the sketch. You can give it a different name if you want like ‘menu_display’. Note that we have called the display ‘lcd’. When using a 20×4 LCD, change this line to LiquidCrystal_I2C(0x27,20,4) This is where you will need to change the default address to the address you found earlier if it happens to be different. The next step is to create an LCD object with the LiquidCrystal_I2C class and specify the address and dimensions.įor this, we use the function LiquidCrystal_I2C(address, columns, rows). #include // Library for I2C communication The other library imports wire.h automatically. *When using the latest version of the LiquidCrystal_I2C library it is no longer needed to include the wire.h library in your sketch. In the rest of this tutorial, I will cover more of the built-in functions of this library. As mentioned earlier we need both the wire.h* and the LiquidCrystal_I2C library. The standard I2C library for the Arduino is the Wire library. The basic START-STOP pattern is pretty easy to implement. You probably are not doing this directly in your code, but are using an existing one, like the Wire library provided by Arduino cores. First, the required libraries are included. This is another detail that seems simple, but can cause some grief when actually implementing an I2C library. ![]()
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