Lcd.begin(16,2) // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display } LiquidCrystal lcd(1, 2, 4, 5, 6, 7) // Creates an LC object. #include // includes the LiquidCrystal Library
#Arduino lcd library tutorial code#
Here’s the source code of the first example from the video: /* Using the clear() function we can clear the LCD screen. The cursor() function is used for displaying underscore cursor and the noCursor()function for turning off. The blink() function is used for displaying a blinking cursor and the noBlink() function for turning off. The setCursor() function is used for setting the location at which subsequent text written to the LCD will be displayed. Using the print() function we print on the LCD. In the setup we have to initialize the interface to the LCD and specify the dimensions of the display using the begin() function. The parameters of this object should be the numbers of the Digital Input pins of the Arduino Board respectively to the LCD’s pins as follow: (RS, Enable, D4, D5, D6, D7). We can do that like this: Sketch > Include Library > Liquid Crystal. The R/W pin will be connected to Ground and the Vo pin will be connected to the potentiometer.įirst thing we need to do is it insert the Liquid Crystal Library. The Enable pin will be connected to pin number 2 and the RS pin will be connected to pin number 1. The LCD’s registers from D4 to D7 will be connected to Arduino’s digital pins from 4 to 7. We will use just 6 digital input pins from the Arduino Board. As an Amazon Associate I earn from qualifying purchases. Breadboard and Jump Wires ……… Amazon / Banggood / AliExpressĭisclosure: These are affiliate links.Arduino Board …………………………… Amazon / Banggood / AliExpress.You can get these components from any of the sites below: Components needed for this Arduino LCD Tutorial In this tutorial we will use it in 4 bit mode, or we will just use 4 of the 8 data pins. We can use the Library in 4 or 8 bit mode. From the Arduino’s official website you can find and see the functions of the library which enable easy use of the LCD. The last two pins A and K, or anode and cathode are for the LED back light.Īfter all we don’t have to worry much about how the LCD works, as the Liquid Crystal Library takes care for almost everything. So through this pins we are sending the 8 bits data when we are writing to the registers or for example if we want to see the latter uppercase A on the display we will send 0100 0001 to the registers according to the ASCII table.
Next is the E pin which enables the writing to the registers, or the next 8 data pins from D0 to D7. The read mode is used by the LCD itself when executing the program which we don’t have a need to discuss about it in this tutorial. Here the write mode is obvious and it is used for writing or sending commands and data to the LCD. Next comes the R / W pin which selects the mode whether we will read or write to the LCD. And when RS pin is set on High state or 5 volts we are sending data or characters to the LCD.
For example if the RS pin is set on low state or zero volts, then we are sending commands to the LCD like: set the cursor to a specific location, clear the display, turn off the display and so on. Next, The RS pin or register select pin is used for selecting whether we will send commands or data to the LCD. Next is the Vo pin on which we can attach a potentiometer for controlling the contrast of the display. The second pin is the VCC which we connect the 5 volts pin on the Arduino Board. It has 16 pins and the first one from left to right is the Ground pin. You can watch the following video or read the written tutorial below.
#Arduino lcd library tutorial how to#
In this Arduino LCD Tutorial we will learn how to connect an LCD (Liquid Crystal Display) to the Arduino board. LCDs like these are very popular and broadly used in electronics projects as they are good for displaying information like sensors data from your project, and also they are very cheap.