Displays We Love Hacking: The HD44780 Family

October 2, 2023 by Arya Voronova 31 Comments

There are too many different kinds of displays – some of them, you already know. I’d like to help you navigate the hobbyist-accessible display world – let’s take a journey together, technology by technology, get a high-level overview of everything you could want to know about it, and learn all the details you never knew you needed to know. In the end, I’d like you to be able to find the best displays for any project you might have in mind, whatever it could be.

There’s a HD44780 clone IC under this epoxy blob! CC0 1.0

Today, let’s take a look at a well-known LCD technology – the HD44780 displays, a type of display that we hobbyists have been working with since the 1980s. Its name comes from the HD44780 driver chip – a character display driver IC that connects to a raw display panel and provides an easy interface.

HD44780 displays are not known for power efficiency, cutting-edge technology, ultimate flexibility, or small size, for that matter. However, they’re tried and true, easy to drive, require little to no computing power on your MCU, and you will be able to buy them for the foreseeable future. They’re not about to get taken off the market, and they deserve a certain kind of place in our parts boxes, too.

If you work with HD44780 displays for a project or two, you might acquire a new useless superpower – noticing just how many HD44780 displays are still in use in all sorts of user-facing devices, public or private. Going out and about in your day-to-day life, you can encounter a familiar 16 x 2 grid of characters in cash registers, public transport ticket machines, home security panels, industrial and factory equipment, public coffee machines, and other microcontroller-assisted places of all kinds! Continue reading “Displays We Love Hacking: The HD44780 Family” →

A small 16x2 LCD display housed in a green and yellow hobby box.

Arduino-Powered Info Display For Your Windows Computer

January 10, 2023 by Chris Wilkinson 23 Comments

If you’ve been pining for a retro-chic 16×2 LCD display to enhance your Windows computing experience, then [mircemk] has got you covered with their neat Windows-based LCD Info Panel.

Your everyday garden variety Arduino is the hero here, sitting between the computer’s USB port and the display to make the magic happen. Using the ‘LCD Smartie‘ software, the display can serve up some of your typical PC stats such as CPU and network utilization, storage capacity etc. It can also display information from BBC World News, email clients, various computer games and a world of other sources using plugins.

It’s clear that the intention here was to include the display inside your typical PC drive bay, but as you can see in the video below, this display can just about fit anywhere. It’s not uncommon to see similar displays on expensive ‘gamer’ peripherals, so this might be an inexpensive way for someone to bring that same LED-lit charm to their next PC build. You probably have these parts sitting in your desk drawer right now.

If you want to get started building your own, there’s more info over on the Hackaday.io page. And if PC notifications aren’t your jam, it’s worth remembering that these 16×2 displays are good for just about anything, like playing Space Invaders.

Continue reading “Arduino-Powered Info Display For Your Windows Computer” →

Manual LCD Makes Information Display Tedious, Educational

April 28, 2017 by Bob Baddeley 28 Comments

The HD44780 is one of the first chips we learned about as a kid, and chances are good you’ve used one in your project at some point, and almost certain that you’ve interacted with one in your life. The character LCD is ubiquitous, easy to interface, and very robust. They come in sizes from 8 x 1 to 20 x 4 and even larger, but they almost all have the same pinout, and there are libraries in many embedded environments for interacting with them. [The 8-Bit Guy] decided to interface with one using just switches and a button, (YouTube, embedded) with the intent of illustrating exactly how to use them, and how easy they are.

Continue reading “Manual LCD Makes Information Display Tedious, Educational” →

Drawing Images On A Character Display

June 12, 2008 by Juan Aguilar 7 Comments

[Dean Hall] doesn’t seem to know his Simpsons characters very well, but that didn’t stop him from coming up with this method for displaying a bitmap on an LCD character display with a Hitachi HD44780 chip.

[Hall] used an LCD with two 16 character rows and 8×5 pixels in each character. He displayed the image over 2×3 characters, which gave him 17×18 pixels (including the spaces between the characters) to work with. The first step after acquiring an image is to rasterize the image by hand onto graph paper. This won’t be scanned, it’s just a diagram to determine which pixels to light up.

Once the 6 characters were determined, [Hall] used this handy web-based tool to convert his graphed diagram to bitmap data. The data is loaded onto the microcontroller and the image shows up on the LCD. This is a pretty straightforward project, just be sure you properly identify your monkeys.

[via YourITronics]