Seven segment LED displays are a very popular mean of displaying numerical information and finds application in front panel display boards of microwave ovens, washers and dryers, digital clocks, frequency counters, and many other gadgets. Compared to the LCD displays, the seven segment LED displays are brighter and provide a far viewing distance and a wide viewing angle. However, the downside is they are resource-hungry. It requires at least 12 I/O pins of a microcontroller to drive a standard 4-digit seven segment LED module. Consequently, their use with low pin-count microcontrollers (such as PIC12F series) is not practically feasible. Here’s a solution for that. The following 4-digit seven segment LED module features a serial interface that requires only 3 I/O pins of a microcontroller and provides full control of all digits and decimal points .
Serial four digit 7-segment LED display module – [Link]
New intelligent display eDIPTFT70 from Electronic Assembly provides all what its smaller relatives and something in addition – the size.
With the 7” size and an 800 x 480 pixels resolution, it can display a relatively considerable amount of information. Similarly like other member of family eDIP (eDIPTFT32 a eDIPTFT43), even eDIPTFT70 eliminates the need of demanding and time-consuming programming at pixels level.
All the control of the display is done on commands level, thus to display text, graphics and many other symbols is exceptionally easy and simple. Control by commands substantially accelerates development and shortens the time to market. At an application development it is possible to use predefined functions, symbols and geometric functions, bargraphs, frames, buttons and many other. In general eDIPTFT70 offers almost the same functions like other eDIPTFT family members, including almost immediate start within a few 1/10 of second.
Single +5V supply, analogue touch panel with a variable raster and software-dimmable backlight brightness contribute to the versatility of usage. In many of applications also 80 various short jingles for audio feedback can be useful. Even eDIPTFT70 contains 3 communication interfaces – RS232, I2C and SPI, that´s why it can be connected to virtually any device. Further information will provide you the eDIPTFT70 datasheet.
New 7“ eDIPTFT70 display – when the size matters – [Link]
Sergei Bezrukov writes:
Controlling big LED displays that use several LEDs for lighting each segment is a certain challenge. The problem is that the voltage drop on display segments is well above the maximum voltage of microcontrollers. This project describes an approach to this problem based on source and sink drivers TLC59210 and TLC59213 manufactured by Texas Instruments.
Big LED clock with automatic brightness control – [Link]
Sergei Bezrukov writes:
This is a shortened translation from Russian of my article published in Радио (Radio) magazine, no. 8 (2010) pp. 21-23. The voltmeter is designed for controlling DC voltages at the output of a dual bipolar power supply. It not a universal instrument, since its input resistance does not exceed 40K, which might be too low for some measurements. However, it is perfectly fine for power supplies and does not noticeably load their output. The range of input voltages is 0 to 24V for positive supply and -24V to 0 for negative one.
The voltages are sampled every 300 msec and displayed on a 9-digit LED display. Only 8 digits are used, the middle digit slot is always off and serves a a separator between negative (on the left part of display) and positive (on the right one) readings. The unit provides a 0.01V resolution. For small negative voltages (not exceeding 10V in absolute value) a leading minus sign is displayed. For positive voltages a leading zero is suppressed.
Voltmeter for bipolar power supplies – [Link]
New graphic display EA DIP180B-5NL brings a high contrast, small power consumption and a fast response. And what is important for the most of people – it is also available with a touch panel.
Display EA DIP180B-5NLWTP was designed for use in industrial control panels. That´s why it is available with an analogue resistive touch panel. This enables to combine control of a device and display of information into a single unit. EA DIP180B-5NLWTP is a graphic display with 180×32 pixels resolution. It contains 3 integrated graphic controllers SED1520 type (or compatible) used to control left, center and right sections of the display. White LED backlight provides crystal-clear picture and excellent readability under all light conditions.
Touch panel is linked to an external controller or a controller with analogue inputs. Touch panel operates similarly like a potentiometer – if a voltage is connected to the „Top-Bottom“ input of the controller, a voltage proportionate to Y (vertical) position is read by a microcontroller from the „Left-Right“ input. By the same process can be a horizontal – X position of a contact determined. Display provides a high level of contrast and a fast response thanks to the use of an LCD „supertwist“ technology. Even at extremely low temperatures of -20°C, the response time is a sufficient 2.5 sec. Module features an automatic temperature compensation, that´s why they don´t require any external contrast compensation during operation. Together with a wide specified temperature range from -20 to +70 °C, the display is ideal for various industrial applications. To fix the module mechanically, it is necessary only to solder pins directly to a PCB, without a need to use screws or other mechanical components.
Touch the EA DIP180 display – [Link]
Programming of a graphic interface perhaps cannot be any simpler. Company 4D Systems brings to developers a new powerful graphic editor, which further shifts borders of simplicity and speed at a creation of a graphic output.
4D ViSi tool enables to very easily and intuitively arrange graphic control and displaying elements into the layout which we wish to achieve on the 4D Systems display modules. As a result, this way you will create the graphic interface very quickly and you can fully focus on the main – the application itself. In other words – you can put your effort to what the application “has to do” and not “how it should look”.
4D ViSi tool is a part of the 4D Workshop3 IDE – Alpha program, which is free to download. 4D ViSi is a powerful SW tool, which enables an immediate overview of your desired graphic layout for 4D Systems display modules. 4D ViSi contains a set of various dials, gauges and meters, which can be simply dragged and dropped onto the desired place. Every item has wide possibilities of adjustment. Without necessity to always reload the source code to a display module, you have a possibility to see every change on a monitor of your computer and all relevant code is inserted into the program at one click. In the enclosed video you can gain a closer view of the work in this program.
Focus on application itself and the 4D ViSi will take care about its look – [Link]
These displays are small, only about 1″ diagonal, but very readable due to the high contrast of an OLED display. This display is made of 128×32 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast; we really like this miniature display for its crispness!
Monochrome 128×32 OLED graphic display – [Link]
Getting Started- Vacuum Fluorescent Display & Teensyduino | A work in progress…. [via]
This is a quick tutorial on getting a VFD working with an Arduino (or Arduino equivalent system). VFDs are beautiful devices with a wonderful hexagonal mesh of wires and this lovely green/blue glow. Operating at around 5V, they offer a nice alternative to high voltage Nixie tubes, while still retaining a lot of the charm.
This tutorial will show you how to connect a Arduino-like device to a VFD display as well as a basic program to display text.
Vacuum Fluorescent Display & Teensyduino – [Link]
DOG series will start with 3 types: 1×8 character, 2×16 and 3×16 character. Outline dimensions are very compact with 55x27mm and especially designed for handheld applications and low power applications. Thanks to the most modern Chip-On-Glas technology (STN and FSTN) overall height is 2.0mm only. Even together with LED backlight thickness will increase to 5.8mm only. Operating temperature range of –20..+70°C (temperature compensated) is standard.
Standard character height of 5.57 mm for the 2×16 makes „DOG modules“ easy readable. User can decide for 3 different interface 4-Bit, 8-Bit and SPI. No need to say that character set with full 248 ASCII characters is installed. Because of direct placement onto pcb production and mounting cost are unequaled low. No special mounting is required.
Combining various display technologies (positive/negative, blue/green/black) with different backlights (white, blue, amber, yellow/green, red) gives the advantage of many different design looks.
Real 3.3V Displays – [Link]