Features. Implements the industry standard Hitachi HD LCD display driver chip protocol; Requires only seven I/O pins on one I/O port. Download the Hitachi HD LCD Controller Datasheet and browse our LCDs that use this controller. Version HDU (LCD-II) (Dot Matrix Liquid. introduction to Hitachi HD LCD module, pinout pin detials,instructions set, commands for HD lcd interfacing with microcontroller.

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The enable line on the other hand is pulled high and when the button is pressed, the line goes to ground.

Secrets of the Hitachi HD LCD: How to display text and bargraphs.

Next we insert the LCD module into the breadboard and power it on. When you insert the module into the breadboard, you need to be gentle and work the pins in slowly because the pins are a bit thicker than you would normally use with a breadboard. How to use the BMP for weather pressure measurement or altitude change detection. Much easier to understand than most other sites. Usually a port is dedicated to one operation so pin modes should be set in the “setup” routine.

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Arduino Code Operation

This is shown in the photo below. Hi is lcd initialization same for all lcds available on the market?


Become a subscriber Free Join 29, other subscribers to receive subscriber sale discounts and other free resources. Click on a table to get a larger view. You can use as many pixels as you want as the bar bitachi routine uses x,y LCD coordinates to start from, and then just a number representing the number of pixels to draw to the right.

HD44780 Character LCD Displays – Part 1

Two versions of the ROM have been developed: By using the hardware in a straight forward way then you can avoid this coding i. Hitachi Liquid crystal displays Display devices. The figure below shows the LCD module and pinout. This is a simple example. The following example uses the print command to continuously output an updated time display every 99ms.

It is a trade off between speed and number of microcontroller pins you have available.

Three different ways to debounce input push switches with one amazing method that you can’t miss. Character LCDs use a 16 contact interface, commonly using pins or card edge connections on 0. Sanchez, Julio; Canton, Maria P.

You will notice that pin 5 RW is tied to ground. The Register Select and data lines are pulled down using a 10K resistor and when the dip switch is closed, those lines go high. In addition you can also generate your own characters. Compatible LCD screens are manufactured in several standard configurations.

Note how the main loop has no code since we only want to initialise and display the text without doing anything else. Non-LED backlights often require higher voltages. The module that we are using is a 16 character x 2 line display that we stock over here.


This is an overloaded function that can print any of the three number types or a string. There’s nothing wrong with the code but it has to do a lot of manipulation to make the operation generic.

For this post I thought I’d try something a little different. From Wikipedia, the free encyclopedia.

Download the Hitachi HD LCD Controller Datasheet Version

Next article Debouncing a switch. Remember Me Lost your password? The enable button has a 10nF capacitor to de-bounce it. You can use this information to display a horizontal bar graph. The Hitachi HD controller has become an industry standard for these types of displays. Those without backlights may have only 14 pins, omitting the two pins powering the light. My thanks and gratitude for such an excellent explanation of how 16 char LCDs work which even I can understand.

Time since last reset Example 3: Data and commands are sent to the module using the 8 data lines pins and the RS line pin 4. This will be discussed in more detail below.