Seven segment LED displays are known to be resource and power hungry. But because they are visually so charming and readable from a far viewing distance and at a much wider viewing angle as compared to any other electronic displays, they are still hugely popular. The required number of I/O pins to drive the LED segments can be reduced significantly by using an additional dedicated hardware. For example, the MAXIM’s MAX7219 device allows you to interface 8 pieces of seven segment LED modules using only 3 I/O pins of Arduino or any other microcontroller.
High-voltage seven segment LED display driver with SPI interface - [Link]
Write messages and show animations on this palm-sized heart-shaped LED display. Works seamlessly with Arduino, and requires only three pins to control. Want a heart matrix of your very own? You can buy this as DIY kit.
Heart Matrix display - [Link]
Visual TFT is a standalone application used for rapid development of graphical user interfaces for TFT displays. Software generates code compatible with mikroElektronika compilers: mikroC, mikroBasic and mikroPascal, for all suported MCU architectures: PIC, dsPIC30/33, PIC24, PIC32, AVR and ARM. Software implements intuitive environment and many drag-and-drop components which can be used for building applications easily and fast.
Visual TFT – Rapid development of GUIs in TFT displays - [Link]
This (SPI7SEGDISP4.40-1R) is a revised version of the previous SPI seven segment LED display (4 digit) board that displayed numerals and decimal points. The new version has a better quality seven segment LED display (LTC-4727JS) with three extra LED segments, as shown below. The additional colon segments are useful in projects where you need to display time (HH:MM or MM:SS).
New version of MAX7219 based 4-digit serial seven segment LED display - [Link]
Ronald Willem Besinga writes:
One of the basic usage of the TIMER peripheral on every microcontroller is to provide the accurate timing mechanism. Using the TIMER peripheral as the basic timing, we could easily develop a stopwatch and display it to the 8-Digit seven segment numeric LED display. Thanks to the Maxim MAX7219 chip which enable us to interface this 8-Digit seven segment LED display much easier using just three wires of the SPI (serial peripheral interface) to display the hour, minute, second, and hundredth of seconds to the 8-Digit seven segments LED display.
Build your own stopwatch using Maxim MAX7219 Serially Interfaced, 8-Digit LED Display Drivers - [Link]
Embedded Lab has posted a new project of constructing an 8-digit seven segment LED display board with a serial interface. Seven segment LEDs are very bright and attractive display devices. However their use in microcontroller projects is sometime limited by lack of I/O resources. The use of MAX7219 allows you to add 8 digits (more if cascaded) of seven segment LED displays using only 3 I/O pins of the microcontroller, and provides full control of all the digit segments and decimal points.
MAX7219 device can be easily interfaced to Arduino using LedControl library. The library also supports cascading of multiple MAX7219 devices.
The serial 8-digit seven segment LED display kit is also available for purchase on Tindie.
Serial (SPI) 8-digit seven segment LED display kit - [Link]
The Centre of Microsystems Technology (CMST), imec’s associated laboratory at Ghent University (Belgium), has developed an innovative spherical curved LCD display, which can be embedded in contact lenses. Unlike LED-based contact lens displays, which are limited to a few small pixels, the new LCD-based technology permits the use of the entire display surface. By adapting the patterning process of the conductive layer, this technology enables applications with a broad range of pixel number and sizes, such as a one pixel, fully covered contact lens acting as adaptable sunglasses, or a highly pixelated contact lens display. [via]
Breakthrough in Augmented Reality Contact Lens - [Link]
In a wide portfolio of development tools for displays from company Electronic Assembly can be found evaluation boards for development of applications with eDIP displays family, including a connectivity via all common industrial interfaces.
Everyone who already ever designed his own development board knows, that it takes a lot of time to design, construct and assemble such a board. That´s why a ready-made development board at an affordable price is always a big simplification. EA EVALeDIP320-TFT70 development kit is a beautiful example of such a set, as it provides an immediate access to a full display functionality and it comes rich-equipped. At the same time it meets a criterion of an acceptable price, because the difference in price of the development board and the display itself is approx. 50 Eur only.
EA EVALeDIP320-TFT70 enables to develop applications in an elegant way and to use all possibilities of 5.7“ and 7“ Electronic Assembly displays. The development kit contains an evaluation board (USB), 7″ display with a touch panel, CD with SW and drivers, 5 small PCBs enabling a communication through industrial interfaces (RS232, RS485, I2C, SPI and RS232-CMOS level), USB cable and a line adapter. The development kit enables to also develop applications, which use input/output pins of the display – 8 push-buttons and 2 trimmers enable to control I/O pins and simulate analog signals, while 8 LEDs indicate logic levels at the corresponding outputs. Another LEDs indicate data traffic and a beeper/ loudspeaker serves as a touch feedback. An advantage of Electronic Assembly displays is, that black-anodized aluminium frames (bezels) are available for many types.
Further information will provide you the EA EVALeDIP320-TFT70 and EA eDIPTFT70-A datasheets. A 5.7” display will be available in the nearest period. In case of interest in Electronic Assembly products, please contact us at email@example.com
Simulate, test, develop – Electronic Assembly evaluation tools will help you - [Link]
The TWIDisplay 8-digit LCD is an easy to use 8-digit 14-segment transflective LCD display. Libraries for Arduino and avr-gcc are available on GitHub.
Only four wires are required for operation, one for power (runs on both 3.3V and 5V), one for ground, and two for the TWI protocol. To control a display like this, a dedicated controller chip is required.
TWIDisplay – 8-digit 14-segment LCD - [Link]
Raj from Embedded Lab shows in his latest tutorial guide how to implement adaptive brightness control to seven segment LED displays for optimum readability in all illumination conditions. The technique has been demonstrated by constructing a temperature and humidity meter that adapts the brightness of the seven segment LED displays to the surrounding lighting conditions.The project uses a general purpose LDR to sense the surrounding illumination and MAX7219 to drive the LED display.
How to implement auto-brightness adjustment to seven segment LED displays – [Link]