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com. In this tutorial, we will learn how to connect the Liquid Crystal Display or LCD to the Arduino board. LCD like these are very popular and broadly used in electronic projects as they’re good for displaying information like a sensors data from your project and also there are very Cheap. We can start this tutorial with the pin out of the LCD.. It has 16 pins and the first one from left to right is the Ground pin.. The second pin is the VCC which we connect to the 5 Volts pin on the Arduino board.. Next is the Vo pin on which we can attach a potentiometer for controlling the contrast. The display Next comes, the RS pin or Register Select pin, which is used for selecting whether we will send commands or data to the LCD.. For example, If the RS pin is set on a low state or 0 volts, then we are sending commands to the LCD like set the cursor to a specific location, clear the display turn of the display and so on., And if the RS pin is set on A high state or 5 volts, then we are sending data or characters to the LCD.. Next comes the RW pin, which selects the mode whether we will read or write to the LCD. Here. The write mode is obvious and it is used for writing or sending commands and data to the LCD.. 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.

. Next is the E pin which enables the writing to the registers or the next 8 data pins from D0 to D7. 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. And the last Two pins, A and K or anode and cathode are for the LED back light., Okay. So after all, we don’t have to worry much about how the LCD works as the Liquid Crystal Library takes care for almost everything. From the Arduino official website. You can find and see the functions of the library which enable easy use of the LCD.. We can use the library in a 4 or 8 bit mode. In this tutorial. We will use it in 4 bit mode or we will just use 4 of the 8 data pins.. Before we write the code. Let’S see the circuit schematic first.. I will use an Arduino Mega Board, 1K Potentiometer and the LCD., So we will use just six digital input pins from the Arduino Board.. The LCD’s registers from D4 to D7 will be connected to the Arduino’s digital pins from 4 to 7.. The Enable pin will be connected to pin number 2 and the RS pin will be connected to pin number 1.. The RW pin will be connected to Ground and the Vo pin will be connected to the potentiometer.

Okay. So now we can write some code for the LCD. First thing we need to do is to include the Liquid Crystal Library. We do it from here, SketchgtInclude Library, gtLiquid Crystal Okay, then we will create a Liquid Crystal object. like this.. I will name it LCD and as a parameter, we will set the pins number on the Arduino respectively to the circuit schematic., So the first parameter is for the RS pin and as we connected to the digital be number 1. I will write here. 1.. The second parameter is the Enable pin and that one we connected to the digital pin number 2 on the Arduino board And the next. The next parameters are for the registers.. So first is for the register, D4 and that’s connected to pin number 4.. Then the D5, D6 and D7, so just like this.. Okay. Next is the setup where we will initialize the LCD and set dimensions. So we do it like this lcd.begin and set the dimensions of the LCD. 16 by 2. Okey, And now it the loop. We will write our main program. First let’s print, something on the LCD using the print function like this lcd.print, I will print quotArduinoquot and make a delay of 3 seconds. So that we cannotice it.. Okay, now using the setCursor function, we can change the location on the display where the next text will be written., So lcd.setCursor And the first parameter is for the column and the second is for row.

. So I will change the cursor to the second column and first row., So this actually will be the second row as this number stars from 0. So 01. That will be the second row. and I will write something again using the print function. I will write LCD tutorial. And I will set 3 seconds delay again.. Okay. After these 2 texts, we will clear the display using the clear, function. lcd.clear Okay.. Now, using the blink function, we can set a blinking cursor like this lcd.blink I’ll, add some delays, so we cannotice it. I will change again the location of the cursor, So we can see that blinking cursor on a different location like this and again, some delay. 3 secods.. Ok, we can also turn off this blinking cursor using the noBlink function.. This will turn on the blinking cursor and we can also set the different cursor like underscore cursor using the lcd. cursor function.. I will add some delays, so we notice it and using the noCursor function we can turn off the underscore cursor as well.. Okay and now I will clear once again the display using the clear function., And that will be our main program, which will repeats all the time. And now let’s see how it works. So here’s, the first text and after some delay the second text on a different Location Here’s, the blinking cursor and again after some delay, the blinking cursor on a different location and the underscore cursor.

. It is also possible to write custom character to the LCD.. It supports up to 8 characters of 5×8 pixels.. We specified the appearance of each custom character by an array of 8 bytes.. Okay. So for that we have to define an array of bytes like this. I will name it quotslashquot, as our custom character will look like slash.. So here this B stands for a binary. Formatter and the five numbers are actually the pixels., The five pixels and we need 7 more of these, So toal 8, so that we get that format of 5×8 pixels., Okay and now what we will change here from 0 to 1. That will create our custom character.. So I will change it like this and that will look as a slash. Now that one we have to initialize or create that custom character in the setup using the createChar function like this., And here we need two parameters. The first parameter is a number from 0 to 7 or we have to reserve one of the 8 support that characters. So here I will just type 7 and as a second parameter, it goes the name of the array of bytes we defined above.. So that will be quotslashquot. And in the loop will write our main program. I’ll, make it look more interesting and make that character moves along the LCD.. So we will use a for loop for changing the location, the cursor., So it will look like this.

Okey that’s. The for loop and now using the setCursor function like this lcd.setCursor And here in the setCursor function, we will use the quotiquot variable from the loop as a column parameter., And now we have to write that character using the lcd.write. We will write the character we defined above., So these two numbers have to be the same. I’ll make 1 second delay and clear the display after each iteration of the for loop., Okay that’s our program let’s see how it works. Here’s our custom character, moving along the Column so the LCD.

 
 

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official.arduino
2019-10-02T19:32:52+0000

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Comment (25)

  1. thank’s for reference, i like this . now I know how to control an LCD. and don’t forget to stop by our channel

  2. the tutorial was explained very well, and it is probably one of the best ever but I did the circuit and the code and I checked it 5 times can I have some advice on what to do now (reply below)

  3. I tried LCD on simulator. Whenever i connect LCD anode and cathode to + and – , it explodes.
    Then i tried it with potentiometers, it still exploded but only at far end position of the potentiometer.
    Do you usually connect anode with resistor or potentiometer?

  4. Is this C++ or C? I’m new to the Arduino and plan on using it for a simple little project. I have a bit of experience with C++. Thanks for your response! 🙂

    1. Arduino uses its own language called References. I don’t have any experience with C so I don’t know how similar they are.

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