Using an extension driver, the device can display up to 80 characters. The Hitachi HD LCD controller is limited to monochrome text displays and is often used in copiers , fax machines , laser printers , industrial test equipment, networking equipment, such as routers and storage devices. Compatible LCD screens are manufactured in several standard configurations. Larger custom sizes are made with 32, 40 and 80 characters and with 1, 2, 4 or 8 lines.

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All the above mentioned LCD display will have 16 Pins and the programming approach is also the same and hence the choice is left to you. It is okay if you do not understand the function of all the pins, I will be explaining in detail below.

Now, let us turn back our LCD:. Okay, what is this two black circle like things on the back of our LCD? A Single character with all its Pixels enabled is shown in the below picture. The LCD can work in two different modes, namely the 4-bit mode and the 8-bit mode. In 4 bit mode we send the data nibble by nibble, first upper nibble and then lower nibble. This enables us to send 8 bit data. Whereas in 8 bit mode we can send the 8-bit data directly in one stroke since we use all the 8 data lines.

Now you must have guessed it, Yes 8-bit mode is faster and flawless than 4-bit mode. But the major drawback is that it needs 8 data lines connected to the microcontroller.

No control pins are used to set these modes. It's just the way of programming that change. Most of the times we will be just writing to the IC, since reading will make it more complex and such scenarios are very rare. Information like position of cursor, status completion interrupts etc. The datasheet is given here. Some important command instructions are given below:. In my project i have to connect a relay to digital pins of the arduino uno board. But I couldn't control the relay since the output is 2.

Could you please guide me what should i do. Hi aparna,. If your Relay is a 5V relay you can use the circuit shown in the link below. Please use the transistor with relay. Here is the datasheet. Need advise on availability and compatibility. Required 12 unit. Tank you for your interesting and usefull articel. Question: Is it possible to find out a pinout from an older, used LCD display? I have different, old displays I got out of still working but sorted out electronic gears like server nodes, video recorders , Of course, I would like to use them and I asked myself, if it is possible, to find out how the pinout for that devcices is.

Yes it is possible!! Get Our Weekly Newsletter! Helena St. Related Content. Coin Sorting Machine using Arduino. Make a Buzz Wire Game with an Arduino. Hi Tank you for your interesting and usefull articel. Log in or register to post Comment. Connected to a MCU pin and gets either 0 or 1.


Download the Hitachi HD44780 LCD Controller Datasheet



Hitachi HD44780 LCD controller


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