Note: Although this guide has been written with the JHDA in mind, any LCD display controller that is compatible with the Hitachi HD interface will work; which is the majority of small display controllers like this. The first thing you will need to do, more than likely, is solder the headers to the JHDA module, as typically they do not come ready soldered together. The resistors used to connect pin 3 to GND and 5v can be changed in order to change the contrast of the screen, or can alternatively be replaced with a 10k potentiometer; for this example though we will stick to the 1k and 10k resistors as this provides a good level of contrast. Once finished wiring it up, you should have something that looks something like this hopefully a bit tidier than mine!

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The most basic form of electronic display available is 7 Segment display — which has its own limitations. The next best available option is Liquid Crystal Displays which comes in different size specifications. LCD modules form a very important part in many arduino based embedded system designs. So the knowledge on interfacing LCD module to arduino is very essential in designing embedded systems. The JHDA has 16 pins and can be operated in 4-bit mode using only 4 data lines or 8-bit mode using all 8 data lines.

Here we are using the LCD module in 4-bit mode. The JHDA lcd module has 16 pins and can be operated in 4-bit mode or 8-bit mode. Pin3 VEE :Contrast adjustment pin. The voltage at the VEE pin defines the contrast. The normal setting is between 0. Pin4 RS :Register select pin. The JHDA has two registers namely command register and data register.

If we make the RS pin LOW and feed an input to the data lines, then this will be treated as a command a command to be written to LCD controller — like positioning cursor or clear screen or scroll. This pin is used for selecting between read and write modes. The commands and data are fed to the LCD module though these pins.

When operated on 5V, a ohm resistor should be connected in series to this pin. In arduino based projects the back light LED can be powered from the 3. The circuit diagram of interfacing LCD to arduino for displaying a text message is shown below. RS pin of the LCD module is connected to digital pin 12 of the arduino.

Enable pin of the LCD module is connected to digital pin 11 of the arduino. In this project, the LCD module and arduino are interfaced in the 4-bit mode. This method is very simple, requires less connections and you can almost utilize the full potential of the LCD module. The 10K potentiometer is used for adjusting the contrast of the display. The arduino can be powered through the external power jack provided on the board.

The full program for interfacing LCD to arduino is shown below. This library can handle both 4 bit mode and 8 bit mode wiring of LCD. Refer the — documentation of LiquidCrystal Library — before you continue down! The library is readily available with the Arduino IDE as its a pre installed standard library. The LiquidCrystal. Other Important aspects of Program. A simple program for scrolling a text message on the LCD screen using arduino is shown here.

In the program shown below, it is chosen to be 2 because the text to be displayed is comparatively long. For shorter texts more number of positions must be scrolled at a time to get a smooth display.

This means the same circuit diagram is enough to interface other size lcd screens to arduino. This is just a practical implementation of the interfacing of LCD and Arduino. A simple digital thermometer using arduino and 3 digit seven segment display had been already published here. You can find that article here: Digital thermometer using arduino.

Read this article before attempting the LCD version. LM35 is the temperature sensor used in this project. It is a three terminal linear analog temperature sensor. The circuit diagram of the LCD thermometer using arduino is shown in the figure below. The LM35 temperature sensor is interfaced to the analog input pins of the arduino. Vcc pin pin 1 of the LM35 is connected to A0 pin of the arduino. Output pin pin 2 of the LM35 is connected to A1 pin of the arduino.

The complete program of the LCD thermometer using arduino is given below. It is same with the number of pins, order of pins and the purpose of pins. So you will have to adjust the values of current limiting resistor to suit the brightness you desire. Another change you might need to make is with the potentiometer setting connected at VEE pin which determines the contrast of LCD.

The only difference is in the setup part of the arduino program, where we declare the number of columns and rows lines of LCD module. This declaration is what makes the program to understand the type of LCD module number of columns and lines of modules used in hardware. We have finished our interfacing tutorial and we learned how to interface arduino to LCD.

If you have any doubts or you come across any problems while interfacing, please ask in comments section. In the meantime, we have the following tutorials — which you may like to read. Interface Arduino to 7 Segment Display — learn how to interface 7 segment display to arduino with examples on interfacing 1 digit seven segment display common cathode and anode versions and 4 digit seven segment display common cathode and anode versions.

Interface LCD to — learn how to interface LCD module to micro controller and display text messages on lcd screen. Excellent breakdown and I am sure many readers will agree this is one of the best we explanations on the LCD display we have read, so many thanks for taking so much trouble to explain all so clearly. Quick question — what distance can the lcd be from Arduino and still function ok when using i2c? I want to mount the display remote from Arduino as I need to use many inputs — will it drive say over 1 meter ok?

Many thanks. These two thing are VERY different. Please learn the difference and in the future, give more thought to the title of your articles such that the title reflects what the article is actually about. I am beginner for Arduino Uno. My LCD is only displaying the first 8 characters in both the upper part as well as the lower part. Could anyone tell me my mistake in this program,i m not able to receive data on LCD. Thanks in advance. Hi iam a beginner to your tutorial.

Can you tell me what programming language you are using while writing a program. My LCD is getting powered. I have checked all the connections thoroughly. Praveen — Please adjust the potentiometer. This can be a contrast issue. Also make sure you have connected data lines properly to Arduino. Enable pin is used to switch between these 2 modes.

We shall publish an article on the same soon. I need the schematics please,am trying to send a four bit binary data to an LCD through an optical fibre cable using an arduino uno as my source of data input. A digital code lock can be used for access control in offices and other such places. Thanks circuits today team to provide us better circuit guidence and project. Author praveen. Why these resistors like nd 10k are used? Mike Murphy 2 years ago.

Ushan 2 years ago. Jim 3 years ago. Dharmesh 3 years ago. Please help me for resolve the issue. Rohan 4 years ago. Christopher Mann 4 years ago. Great tutorial with examples! Save me a lot of time digging through spec sheets. Sai 4 years ago. Saptarshi Das 5 years ago.

It can be a problem with contrast of LCD. Adjust the potentiometer to solve this problem. Nikhil 4 years ago. Jabir 4 years ago. Peter Raj 4 years ago. Ajay 5 years ago. Ajay — We shall! Very soon! Please check the website next week.


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