Tutorial on how to make your own custom LCD at home!
DIY Custom LCD - [Link]
By Jim Harrison:
The human-machine interface, once simply known as an “operator panel” or “terminal”, is changing rapidly, due to the graphical, visual way operators now interact with an industrial machine or process. At one time, designers of these systems could get by with a three-line segmented LCD display. Today, LCD interfaces are quickly replacing traditional LED and segment LCD displays as designers take advantage of the aesthetic, flexibility, and cost benefits they provide.
MCUs with High-Resolution Graphics Control - [Link]
I2C, SPI, RS232, all these are interfaces, through which eDIP series intelligent display are able to communicate.
Display with a good legibility even in non-optimal light conditions is always an advantage. When we add to it a significant simplification thanks to built-in character sets and graphic functions, we get a display of the eDIP a eDIP TFT series from company Electronic Assembly. Powerful command, touch panel and a high flexibility enable to shorten a development time to a minimum. To an easy usability als contribute very compact dimensions with a maximized screen area. Seven built-in character sets can be displayed up to 4-times scale and by one command they can be rotated in 90° for a vertical display. All character sets can be modified by a „Font tool“ utility and similarly it´s also possible to add your own sets. Commands like menu, clipboard, bargraph, draw, … enable to relatively easily create a graphic output in a combination of text+graphics.
Various versions of displays feature various inner memory sized depending on a display size, sufficient for placing of many pictures and macros. The newest member of the eDIP/eDIPTFT family is the type eDIPTFT5.7 (640x480px). Natural helpers of development are evaluation boards, which we also keep in stock.
The fastest overview about various versions will provide you an attached table, eDIP and eDIPTFT flyer, as well as datasheets at particular types beneath the article. Several types are also available with a touch panel – their ordering code contains an “ATP” suffix.
eDIP and eDIPTFT displays speak many languages - [Link]
Zak Kemble build a digital wristwatch with a 1.3″ 128×64 OLED display & AVR ATmega328P microcontroller:
The main incentive behind this project was to see how much I could cram, in terms of both hardware and software, into a wristwatch-like device that is no larger than the display itself. An OLED display was chosen for being only 1.5mm thick and not requiring a backlight (each pixel produces its own light), but mostly because they look cool. The watch was originally going to have a 0.96″ display, but this proved too difficult to get all the things I wanted underneath it. Going up a size to 1.3″ was perfect.
DIY OLED digital wristwatch - [Link]
FTDI introduces on the market technology EVE – complete graphic solution suitable also for slower microcontrollers.
Paraphrase with the woman´s name is very near to a name of a new technology of display control – EVE – embedded video engine. Company FTDI as a well known producer of USB solutions with a slogan USB-made-easy, decided to bring this philosophy even to a field of graphic solutions. The first representative of a new family is the FT800 graphic chip, containing all necessary to create a powerful graphic output. Perhaps the biggest advantage of this solution is, that „EVE“ puts only minimal requirements on the speed (and resources) of a Host processor, that´s it can cooperate even with smaller „low-end“ microcontrollers (Atmega, PIC, 8051,….) with a very small power consumption.
The essence of small requirements for a Host processor resides in a fact, that FT800 contains al functional blocks necessary for graphic operations and control of the display itself like:
● graphic controller with a clock (timing) generator
● touch panel controller
● frame buffer
● memory (registers, ROM, RAM)
● graphic processor and co-processor
● MCU interface (I2C, SPI) and other blocks.
Moreover FT800 also contains an audio module (synthesizer and a DSP sound processor with DAC) thus FT800 also provides a sound output (mono).
Besides a significant simplification of a graphic output is the idea of „EVE“ also based on a fact, that it has to enable a cheap production of a graphic output for a target device. According to an example from FTDI (displayed on an attached picture), it´s possible to simply build a powerful „display“ for the price of under 19 USD (at a volume production). At the same time this solution lowers requirement for a count of components (BOM) and also for a PCB space. Graphic capabilities of a new chip are really impressive as it features even such properties like anti-aliasing (subjectively sharper image even on a low resolution display), alpha blending (shading, 3D,…) and built-in complex pre-defined shapes and tools. All programming of FT800 is object-oriented, so for example drawing of a simple bargraph takes only 5 commands. To create a graphic user interface (GUI), the user initializes an object memory (up to do 256 kB) and then controls specified objects and their attributes. The result is the above-mentioned low load on a Host processor.
Only a brief description of all technical features would take a few pages, that´s why we rather recommend you to look at the attached video, FTDI EVE presentation, and to study FT800 datasheet. Further information will provide you documents FT800_Programmer_guide, AN_240_FT800_From_the_Ground_Up and AN_252_FT800_Audio_Primer. For a development support, there are also available various evaluation boards of the VM800 series. Guide price of the FT800 is 2,75 USD (100 000 pcs).
For a detailed information about prices, availability and further support, please contact us at firstname.lastname@example.org.
Is a display design difficult? Leave it to „Eve“! – [Link]
herpderp @ dangerousprototypes.com forums build a nice PIC32 controller board for a 2.8″ TFT display. He writes:
In the beginning, I just wanted to play with these cheap TFT screens available on eBay (displaying some pictures & text, nothing more); step by step, I finally designed a PCB and a built a consequent software with many 2D basic functions and even a small GUI.
The board is based on a PIC32 and a 2.8′ TFT with touchscreen (ILI9320 controller, using 16bits PMP). The PCB is 4.9 x 4.9 cm, 2 layers (=> $15 / 10 units at seeedfusion).
PIC32 controller board for 2.8′ TFT touchscreen - [Link]
Qtechknow @ instructables.com
Have you ever heard of TFT LCD screens? They are great ways to display information from your Arduino, or display pictures. The Arduino team just released an official TFT LCD screen with their new Robot at Maker Faire 2013. It’s very easy to get started with!! This tutorial will show you how to get the LCD up and running, load information from the SD card, and make a few simple projects.
The TFT LCD screen is a great way to detach your computer, and have the Arduino relay information that you need to know onto the LCD. A great part of the LCD is that it has a built in microSD card socket. You can store images on the microSD card socket, and even some text!
Your Image on an Arduino! – TFT LCD Screen Guide - [Link]
Raj on embedded-lab.com writes:
LCD displays are commonly supplied as a module with a built-in driver circuitry usually mounted on a PCB at the rear of the module. While this strengthen the module mechanically, it has some drawbacks such as it increases the thickness of the display module and raises the manufacturing cost. NXP semiconductors describes the Chip-On-Glass technology (COG) in this white-paper, whereby the integrated circuit driving the display mounts directly on the display glass, thus reducing the system cost. COG is a very reliable and well established technology, and offers very thin profile LCD display modules at lower cost.
Chip-On-Glass (COG) technology for LCD displays - [Link]
ArthurTC @ instructables.com writes:
In this instructible we will learn how we can hook up an LCD based on the HD44780 chipset to the SPI bus and drive it with only 3 wires for less than $1. Although I will focus on the HD44780 alphanumeric display in this tutorial, the same principle will work pretty much the same for any other LCD which uses an 8 bit parallel data bus, and it can be very easily adapted to suit displays with 16 bit data buses.
The HD44780 (and compatible) based alphanumeric displays are usually available in 16×2 (2 lines consisting of 16 characters) and 20×4 configurations, but can be found in many more forms. The most ‘complicated’ display would be a 40×4 display, this sort of display is special as it has 2 HD44780 controllers, one for the upper two row and one for the bottom two rows. Some graphic LCDs have two controllers as well.
3-Wire SPI HD47780 LCD for less than 1 dollar - [Link]
by Publitek European Editors:
This article describes the development of touch sensing and switching techniques capacitive sensing technology. Products cited include both stand-alone capacitive sensing controller ICs and microcontrollers (MCUs) that include touch sensing as a peripheral function. Capacitive touch sensing has experienced explosive growth to become the default human interface for several classes of consumer product. Users of tablets, smartphones, portable media players, and GPS systems now expect a sophisticated and responsive touch interface as a matter of course. This, in turn, has modified the expectations that the user base has of the smart device and domestic appliance markets; consumers now come, in effect, pre-programmed with the language of tap, drag, swipe, and pinch. High-end products that do not offer that mode of user interaction risk being “uncool”.
Capacitive Touch Sensing Moves from Exotic to Everyday - [Link]