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Seven-segment LCD uses two-wire interface - 09/04/03 EDN-Design Ideas You can connect seven-segment LCDs using only a two-wire interface (Figure 1). The two-wire interface may be at the field-effect, direct-drive LCD or at a serial interface (such as I2C) that uses an eight-pin microcontroller. The design in Figure 1 uses an Atmel (www. atmel. com) ATtiny12 microcontroller, IC1. VCC can range from 2.7 to 5.5V. Each digit receives drive from an 8-bit 74HC164 shift register, which provIdeas seven outputs for each of the segments and one output for a decimal point or a colon__ Circuit Design by Hans Krobath
Simple Circuit active-matrix-LCD bias supply operates from battery input - 02/03/00 EDN-Design Ideas Many active-matrix-LCD applications need multiple voltages for thin-film-transistor (TFT]bias. Typically, three voltages are necessary5V forcolumn driver; a positive voltage, such as 10V; and a negative voltage, such -5V, for __ Circuit Design by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA
Simple Circuit LCD interface takes two wires - EDN-Design Ideas March 26, 1998 [ NOTE
: File has multiple design, scroll for this one.] Alphanumeric LCD modules can provide an attractive display for a project, but their parallel I/O lines require a large number of outputs from a µC. For example, a direct LCD interface would consume all of the I/O pins of a small µC, such as the eight-pin PIC12C508 from Microchip Technology (Chandler, AZ).__ Circuit Design by Ed Maste, Jem Designs, Pickering, ON, Canad
Simple Circuit Tester Check LCDs - 10/03/02 EDN-Design Ideas RF oscillator uses current-feedback op ampManufacturers of electronic equipment use LCDs for calculators, watches, mini-videogames, and pagers, for example. In comparison with LED-based displays, which consume power on the order of tens of milliwatts, an LCD consumes only a few microwatts. __ Circuit Design by D Prabakaran, NL Polytechnic College, Tamil Nadu, India
Single IC Biases LCD & GaAsFET Amplifier - 04/09/98 EDN-Design Ideas (File ,contains several circuits, scroll to this one) Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in Figure 1 provIdeas 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power amplifier. This bias combination exists in cell phones__ Circuit Design by John Wettroth, Maxim Integrated Products, Apex, NC
Song Number Display - Here’s a circuit to display the song number in an audio system for quick reference to songs. It also serves the purpose of an extra visual indicator in modern audio systems.When...___ Electronics Projects for You
SPI Interface Big 7-Seg LED - Big display for general purpose usage, the interfacing is SPI serial interface, requires only 3-wires. Multiple digit can easily be made. DXF files single side PCB. __ Designed by Wichit Sirichote
Switch Configures Bare-Bones, Two-Digit Display - 12/21/95 EDN-Design Ideas A project that includes a stage with three selectable gains (0.1, 1.0, and 10) requires that the rotary-gain switch also function to illuminate one of three LEDs. These panel-mounted LEDs serve to indicate the gain in use. This arrangement requires two switch sections—one for selecting the op amp’s gain-set resistor and one to light the corresponding indicator LED. The circuit in Figure 1 requires only one more switch section to provide a true, two-digit, seven-section numeric LED display. The circuit needs no active driver-decoder circuitry__ Circuit Design by Joe Wonoski, Yale University Medical School New Haven, CT
Techniques for 92% Efficient LCD Illumination - Linear Technology AN55 __ Designed by Jim WilliamsAug 1st, 1993
Techniques for 92% Efficient LCD Illumination - AN55 Linear Technology This publication details several LCD backlight circuits which feature 92% efficiency. Other benefits include low voltage operation, synchronizing capability, higher output power for color displays, and extended dimming range. Extensive coverage of practical issues includes layout problems, multi-lamp displays, __ Linear Technology/Analog Devices
Techniques illuminate backlit LCDs with high efficiency - 01/06/94 EDN Technical Article: Getting a backlight LCD lamp to turn on is just the first step in the design process. Achieving and maintaining high efficiency requires attention to both circuit-design and physical-layout details. __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke. He was 63.
Teletext Devices - Specifications and designs are subject to change without notice.
Use on your own risk. __ Designed by Mijo Kovacevic, S51KQ
Tester checks LCDs - 10/03/02 EDN-Design Ideas RF oscillator uses current-feedback op ampManufacturers of electronic equipment use LCDs for calculators, watches, mini-videogames, and pagers, for example. In comparison with LED-based displays, which consume power on the order of tens of milliwatts, an LCD consumes only a few microwatts. __ Circuit Design by D Prabakaran
The Cheap But Useful ErICsson Cell Phone Display GA628 - You used to have an Ericsson Cell Phone GA628 and you also loved it very much, however after few years of using, you’ve decided to change a brand new cell phone and you just threw it inside the drawer and never touch or look on it after that?___ ?
Thermally Compensate LCD Contrast BIASs - 03/16/95 EDN-Design Ideas The circuit in Fig 1 provIdeas digital control and automatic thermal compensation for LCD contrast bias. This control and compensation eliminates the need for panel-mount hardware and frequent manual adjustment of LCD contrast in changing temperature environments. Major components in Fig 1 include an inverting current-mode PWM regulator,__ Circuit Design by Damian Anzaldo, AVO International-Biddle Instruments, Blue Bell, PA
Tricks improve on Excel LCD initialization - 04/11/02 EDN-Design Ideas A previous Design Ideas on using Excel for LCD initialization relies on the user for cutting and pasting from Excel into an editor(Reference 1]. It appears that it would take a minimum of six keystrokes or mouse strokes from one character to a new character to perform this operation. This procedure does not allow for the addition of comments, which would be advantageous in the maintenance__ Circuit Design by Aubrey Kagan, Weidmüller Ltd, Markham, ON, Canada
Ultra Low Power LCD Indicator - This circuit serves as an ultra-low power replacement for multiple LED on-off indicators. It also has the advantage of being easy to read in full daylight. With the parts shown, it is possible to display four bits of information. __ Designed by G. Forrest Cook
Ultracompact LCD Backlight Inverters - Linear Technology AN81 __ Designed by Jim WilliamsSep 1st, 1999
Ultracompact LCD Backlight Inverters - AN81 It has become desirable to fashion laptop computers with large area screens, leaving little room for the display's backlight inverter electronics. Miniaturization limitations of high voltage magnetic transformers impose limits on achievable space reduction. Another voltage step-up technology, piezoelectric transformers, __ Linear Technology/Analog Devices
Ultralow-cost, two-digit counter features few components - 17-Aug-06 EDN-Design Ideas Two seven-segment displays and one microprocessor count from zero to 99 EDN-Design Ideas Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria
Use an LED Matrix Horizontally - 02/16/12 EDN-Design Ideas Using one 5×7 LED matrix horizontally instead of vertically allows the display of two characters instead of one. LEDs provide a convenient way to electronically display information. Although the seven-segment LED display, arranged in the form of the digit 8, is common, it does not allow the display of some alphanumeric characters. A 5×7 LED matrix allows the display of all ASCII characters, as well as graphics shapes. LEDs provide a convenient way to electronically display information. Although the seven-segment LED display, arranged in the form of the digit 8, is common, it does not allow the display of some alphanumeric characters. A 5×7 LED matrix allows the display of all ASCII characters, as well as graphics shapes. The circuit in this Design Idea shows an unconventional way to use a 5×7 LED matrix.
- Design by Benabadji Noureddine
Waveform Monitor with LCD - The result was a project that includes a waveform capture circuit, a graphic LCD (Liquid Crystal Display) and a control panel with LED indicators. The details of the Graphic LCD display unit, composed of the LCD module, a serial interface, and bias supply were published earlier on this site, __ Designed by Dick Cappels
White LED driver backlights LCD & keypA - D - 13-Nov-03 EDN-Design Ideas Designers widely use white LEDs to backlight color LCDs and keypads in handheld devices, such as cell phones, MP3 players, GPS navigators, and PDAs. Their spectrum and brightness represent near-ideal light sources. One possible configuration for a phone or a phone/PDA combination is to have a group of three LEDs to light the display and six LEDs for the keypad__ Circuit Design by Fabien Franc, Catalyst Semiconductor, Sunnyvale, CA
Wide Band Fuel Mixture Display - This document is an introduction to the Wideband Fuel Mixture Display (FMD). __ |
