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Digital Readout Circuits, Page 1
Digital Readouts:  #'s - C     D - L     M - R    S-Z

Last Updated on:
Thursday, April 07, 2016 01:00 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

µP Displays 10 Bit Data on Three LEDs -  11/07/96 EDN Design Idea   circuit in Figure 1 uses a PIC16C55 µP to read 10-bit binary data and directly display data in decimal format on three common-cathode LED displays. If value of data exceeds 999, displays show three hyphens (---) to represent. . .  [by Yongping Xia, Philips Lighting Electronics, Torrance, CA]


5x7 Display -  Sit back and take a big breath. You are about to take part in one of the best microcomputer (microprocessor) projects you have seen. It uses a PIC16F84 micro and you will be shown how to program the chip to create quite amazing effects. It's a simple project and you will be starting at the beginning of programming, so don't worry if you have never worked with a microprocessor before. . .  [Collin Mitchell's web site]

7 by 10 LED Moving Sign -  This sign I designed uses no microprocessor. It has an EPROM  and multiple counters. As in most electric signs, the LEDs are matrixed, and strobed very quickly. . . .  [Bob Blick's design]

7 Segment LED Counter -  This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores) , or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily (see Notes) . . .  [Circuit designed by Aaron Cake]


72 LED Clock -  In the circuit above, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is comprised of eight 74HCT164 shift registers cascaded so that a single bit can be recirculated through the 60 stages I. . .  [Bill Bowden]


7-Segment Display -  This experiment is more of an introduction to the 4511 decoder/display driver IC than it is a lesson in how to "build up" a digital function from lower-level components. Since 7-segment displays are very common components of digital devices, it is good to be familiar with the "driving" circuits behind them, and the 4511 is a good example of a typical driver IC (circuit add 6/07) . . . 


7-segment LCD uses two-wire interface -  09/04/03 EDN Design Idea   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 provides seven outputs for each of the segments and one output for a decimal point or a colon. . .  [by Hans Krobath ]


8x8 Animated LED Signboard -  The firmware supplied incurrent source code archive is VERY BASIC. I do intend to draw more patterns. However, a vast workload coupled with possible emigration has put finished firmware on hold. Please do go ahead and build this circuit though supplied firmware is fully functional. You can have hours of fun designing your own patterns and effects!UsesPIC16F84. . .  [Lewin A.R.W. Edwards]


9 Second Digital Readout Countdown Timer -  This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, . . .  [Bill Bowden]


A Novel Process for Vacuum Fluorescent   VF Display Drivers -  Application Note. . .  [National Semiconductor]


Air display -  A Noisemaker without noise. A simple rotating display. Just spin and enjoy. While the "Air display" is rotating, it writes the message on the air. Because the "persistence of the vision", you will be able to read the message. Circuit, see JP6293E. gif. Download the HEX file, Program the PIC with JP6293E. hex. Algorithm, Build your own Air Display using code. txt. . .  [Jose Pino designer]


AN-1127: LVDS Display Interface -  Application Note. . .  [National Semiconductor]


AN-1207: Rsds™ Flat Panel Display Design Guidelines Part 2 -  Application Note. . .  [National Semiconductor]


AN-378: A Novel Process for Vacuum Fluorescent   VF Display Drivers -  Application Note. . .  [National Semiconductor]


AN-990: Radiated Emissions & CRT Displays -  Application Note. . .  [National Semiconductor]


Animated LED Signboard PIC16C84 -  Schematic only, no circuit description. . .  [Lewin A.R.W. Edwards]


Big 7-Segment LED Display Board with SPI Interface -  The circuit uses a serial-in-parallel out shift register, 74HC595 for receiving serial data from uController board. See example of U5 in schematic, SER is for data input, SRCLK is shift clock and RCLK is Latch clock. Each data bit is shifted into register on rising edge of shift clock. When all data bits are shifted into8-bit register, rising edge of RCLK will clock data to be latched at each output bit, I. e. QA QH. . .  [Wichit Sirichote, designer]


Call Sign Annunciator -  In the USA, R/C wireless video hobbyists are required to operate their video transmitters under the FCC Part 97 regulations (amateur radio). The only exceptions are the Part 15 approved systems, but these low power alternatives are rarely used. Other countries have similar requirements. Playing by the rules will certainly prevent conflicts with government officials, since they can levy substantial penalties to offenders. But more importantly, following the rules is the basis of good amateur radio manners. . . .  [RC-CAM by T. Black]


Circuit Thermally Compensates LCD Contrast Bias -  03/16/95 EDN Design Idea   The circuit in Fig 1 provides 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 . . .  [by Damian Anzaldo, AVO International-Biddle Instruments, Blue Bell, PA]


Connecting AT90S2313 with LCD display 2x16 char & 4x4 keypad -  A very simple circuit for experiments with AT90S2313,  2x16 LCD display and 4x4 keypad. The clock is based on 4 MHz crystal, but you can use any other crystal between 1-4 MHz. The keys with the name "A","B" . . . "F" are typed to the LCD with numbers 10-16. . . .  [by Serasdis Vasilis]


Digital Readouts:  #'s - C     D - L     M - R    S-Z

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