A numeric display consisting of seven segments per digit, allowing characters 0 to 9 to be displayed by selecting which segment is on or off. Can have each digit independently controlled, or can be multiplexed to reduce pin count. An 8th segment can be included for a decimal point.

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Simple high side driver for multiplexed 7-segment displays?

How can I best drive and switch high side power (for multiplexing) between the 7 displays with as few components as possible, for under $2 (qty 100). I am trying to simplify a design. I have a ...
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2answers
80 views

Shift registers(?) failing after being left on a while

Resolved: SLCLR on SN74HC595 was not tied to VCC, so behavior was inconsistent. I have a custom built board that is running seven 7-segment displays, multiplexed using SPI from an 5v Arduino Pro ...
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2answers
85 views

Possible to use 7447 to drive common-cathode 7 segment display?

I know that the 74(LS)47 is designed to drive common-anode displays. However, is it possible to make it drive a common-cathode display? What is the simplest (in terms of components) way of doing this? ...
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2answers
88 views

How to drive a single 7 segment display with I2C?

I am looking for a solution to drive a single 7 segment display with I2C. I found some websites that shows 2 or 4 digits with I2C but I didn't find a solution for driving a single digit. I'm making a ...
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2answers
57 views

Difference between 7446,47 etc

I have looked in the data sheets, as well as the TI article, but I am still unsure of the answer to this question: What is the practical difference between a 7446 ("BCD to 7 segment decoder/driver ...
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1answer
62 views

7 Segment display binary to decimal

I have a few questions about 7-segment LED displays. When we build a circuit using 7 segment (common-anode) and decoder (7447), we also use 4 tactile switches to make combinations. Should I directly ...
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2answers
83 views

7-segment display driver IC [closed]

Which IC can I use to control 7-segment display? I want to make simple projects like a reaction timer but I don't have an Arduino or some other microcontroller available. What ICs can I use instead?
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1answer
64 views

How to read SAA1064 7-segment values

I have a central heating system that displays it's info and error codes on 4 7-segment displays. These displays are driven by a SAA1064, like so: This SAA1064 (datasheet here) receives it's ...
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1answer
84 views

Display for outside (sun)

I am currently working on a little project where I would like to have a display which would have to support this format: 00 00:00:00 This would have to be used outside on a motorcycle ...
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2answers
64 views

Driving three large 7.5v common anode 7-segment displays with Arduino

I'd like to drive three common anode 7.5v 10ma 7-segment displays using my arduino uno and a few 74HC595N shift registers. The problem is the uno only outputs 5v 40ma on the digital pins. I am ...
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2answers
72 views

low power displays

What kind of displays can I use effectively with a coin cell battery (CR2450)? The backlight or the entire display would be on only when necessary. From previous answers I know that a liquid crystal ...
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1answer
87 views

7-segment driving circuit not working as expected

I have designed and built the following 7-segment driving circuit utilising an Arduino Micro in order to try and further understand electronic circuit design: simulate this circuit – ...
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1answer
224 views

Display digits on 7 segment 3 digit LED display with Launchpad

I have a 7 segment led display with 3 digits (BT-M512RD-DR1 ) and Valueline Launchpad MSP-EXP430G2 I connected LED display according to this answer and here is my version of the sketch But I am ...
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0answers
84 views

Help with ICs, 2-digit 7-segment displays, 74HC4515

Can someone show me how to connect two DC56-11YWA 2-digit 7-segment LED displays to an Arduino Uno or Mega2560 using two 74HC4515s? Is there another IC that I will need in addition? I want to display ...
3
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2answers
151 views

How to “deserialize” a digital output to 4 digital outputs

I am working on a small test project for my Arduino and as part of it, I want to display a number on a 7-segment LED system. My first setup involved just direct links to the 7-segment display and ...
2
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2answers
138 views

BCD to 7 Segment Decoder Schematic: Need help fitting in page

I am working on the schematic for a BCD to 7 segment decoder right now. I understand the logic, but it is the design of the schematic that I need help with. Here is my schematic so far: As you can ...
2
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2answers
283 views

How to filter out the mains power supply spikes?

I'm purposely dropping AC from its normal levels (230VAC @50Hz) just to analyse the behaviour of a DC motor drive board that I have. When the AC mains voltage falls below 180V, the 7 segment display ...
2
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1answer
258 views

Constructing Excess 3 BCD to 7 segment decoder - circuit hints needed

I am currently trying to construct a circut for an Excess 3 BCD to 7 Segment decoder. Therefore the input range ranges from 0011 to 1100 in binary inclusive with the rest of the inputs being don't ...
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2answers
127 views

Reducing power consumption in controlling 40 7-segments [closed]

Following that post here: Designing a large 7-Segment display To give you the basic approach I did that: form the uC to shift register followed by ULN2003, then connected 8 7-segments together Put ...
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3answers
106 views

Seven Segment problems,voltage and current

I want to ask a question about a project I am making, I am using a seven segment. Here is Information about the seven segment: http://www.4project.co.il/documents/doc_188_54.pdf I want to use this ...
2
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2answers
352 views

Weird ULN2003 to 7-segment behaviour in Proteus

I'm trying to drive a 7-segment common anode, in the following connection, however there is no output the comes from the ULN2003 at all, its like when it gets a 0 in the input, it gives a tri state ...
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1answer
234 views

Designing a large 7-Segment display

I'm trying to design a product that have the following features for mass production, and I'm asking from your experience, how to get the lowest price for the components, quality of the chips in terms ...
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1answer
120 views

How to connect 3-digit display and suppress leading zeroes?

I searched a little and it told me to use with more than one display, connect (Ripple Blanking Output) from most significant 7447 to the of the next 7447. Which number would be most significant? ...
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2answers
168 views

What seven segment display do I have? [closed]

I'm having a surprisingly hard time figuring out which seven segment display I have on a board I'm looking at. It is common anode, as there is one pin tied directly to Vcc. It's like this, except ...
3
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1answer
254 views

Why is my LCD stop to work correctly when my pump is running? [duplicate]

I have a 8x8x8 lcd/led/button module (tm1638 chip) connected to my Arduino r3. When I attach a pump (GPH350, 1.5A, 12V to the same power supply (12V, 5A) - my display stops working correctly (only ...
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0answers
232 views

MAX7219 interfaced with ATmega128 producing strange results on 7 segment display

I have built a circuit using an ATmega128 interfacing a MAX7219 decoder to control a 7-segment display. I would appreciate if anyone could help me figure out a problem I'm having with my setup. I am ...
2
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3answers
623 views

Cheap 4 digit 7 segment display driver

Can anyone recommend a cheap ( less than $4 ) driver chip capable of driving a 4 digit, 7 segment display with the center colon? I'm very familiar with the likes of the MAX7219 and similar but they ...
5
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1answer
69 views

7-Segment Decoder outputs/LED display

What would be the difference in using a 7-segment decoder with active-high outputs vs active-low outputs, to driver an LED display?
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1answer
132 views

How to change colour of a 7-segment display using the Arduino [closed]

Is it possible to change colour of a 7-segment display using an Arduino Uno?
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0answers
223 views

Counters VHDL multiplexer 7 segment

I am new to vhdl and my code may seem stupid but i am still struggling i am trying to make a bcd counter using spartan 3 kit i have a problem multiplexing the 7 segment and i know i should use ...
3
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2answers
179 views

Shift Registers Controlling Seven-Segment Display without a Latch?

I'm restoring a Model H Skee-Ball machine, and these old models have a bunch of hardcoded settings and unreliable switch detection, so I want to replace the main control circuitry with something ...
0
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2answers
89 views

How to cycle through bits of information for a hex display?

I am doing some work with a Hex Seven Segment Digital Display with a built in decoder that takes in 4 bits of information. Controlling it I have 4 cascading T-FlipFlops whose outputs are inverted so I ...
9
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3answers
392 views

Low power, seven segment display

I want to display a 4 digit number on a small device that fits in a hand. I have a CR2032 3V battery at around 230mA, my microprocessor is a 8051 (in a BLE112) usually uses about 0.9µA and I want the ...
2
votes
1answer
242 views

How to use Darlington arrays to source current in a 7-segment display driver

I'm building a driver for a large common-cathode 7-segment display using a shift register and BJT transistors (more details in this question). I wanted to make it more compact by replacing the ...
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2answers
2k views

How to drive a 12V common cathode 7-segment display with 5V signals and BJT transistors?

I'm having trouble designing a driver for a large (5") 12V common cathode 7 segments display using a 74HC595 shift register and BJT transistors. Below are the schematics for the component (display) I ...
3
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2answers
377 views

Driving 7 segment displays through Raspberry Pi's GPIO

So I was thinking of wiring up four 7-Segment displays through the Raspberry PI. I'd do that by multiplexing each of them, and came across this: ...
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3answers
472 views

Driving 12 Seven Segment Displays from an Arduino

I will be using the 14 input/output Arduino. My goal is to create a plane radio console for use with a flight simulator. I am very competent at writing code, but have little knowledge of electrical ...
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0answers
405 views

How to drive seven-segment LCD with CD4055 IC

I have a problem using DE-112 seven-segment (two digits) liquid crystal display with CD4055BE IC. As far as I know, LCD should be provided purely AC current, or it will be damaged with time. I have ...
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1answer
173 views

7 Segment display Stuck on number 0 [closed]

I'm new to circuits and am trying to make a 7 segment display decoder with a 4511. My display is stuck on zero, nothing happens when I press any of the switches, what could be wrong? Here is a photo: ...
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3answers
263 views

Solderless Board IC decoder 4511

I'm new to circuits, I tried following this link http://www.electronics-tutorials.ws/combination/comb_6.html to create a 7 segment decoder. I have set up everything on a solderless board, but I have ...
0
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1answer
254 views

i2c + 7 segement serial display + ATtiny85

I have a project that requires a 7 segment display and I was trying to get away with using the smallest micro controller possible. Does anyone see any problems with connecting an ATtiny85 to a 7 ...
1
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1answer
106 views

MM5452 with 4 digit parallel 7-segment LCD display

I have a question regarding the backplane connection for the MM5452. From this data sheet: MM5452/MM5453 Liquid Crystal Display Drivers It says that the backplane pins on the MM5452 connects to a ...
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3answers
203 views

Cannot find GND on 7 Segment Display Datasheet

I'm trying to use a 7 Segment Knightbright LED Display, however, after careful study of the datasheet, I'm unable to find what I believe should be the GND pin to power a segment! ...
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1answer
203 views

Multiple 7-segment displays connected to P1 of AT89C51

I want to connect three 7-segment displays on port-1 of AT89C51. The display unit has to show some number count. My question is: What should be the refresh interval for TDM signals on this port so ...
0
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0answers
270 views

Problem Refreshing 4-digit 7-segment display with UART on the MSP430G2553

I'm working on a program that: samples the ADC every half a second with timer interrupt sends a signal via UART on button press (port 2 interrupt) displays the ADC value to a 4-digit multiplexed ...
4
votes
1answer
288 views

7-segment output: 4-6V, LCD input: 3-5V. How to convert?

Problem: I am thinking of using a chip that gives out 4-6V on 7-segment output pins but the LCD only wants 3-5V input, so I need to convert somehow. The display is a TN type, drawing virtually no ...
3
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4answers
566 views

Using a 7 segment display to show numbers 1, 2, 3 and 4 with four inputs

I have in my car 4 LEDs which illuminate in the instrument cluster depending on the gear the vehicle is in. This is a factory standard setup which I have already run feeds from ready for the next ...
2
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1answer
243 views

How do I control a seven segment display with a shift register and an Arduino?

I recently purchased 4 seven segment displays from sure electronics. They came with their own shift register board which combines the 74HC595 IC with the ULN2003. I want to be able to tie into this ...
2
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0answers
403 views

Alarm Clock 7 Segment LED display

I recently got an alarm clock from goodwill and took it apart and am probably going to use the display for some tests. Here is a picture of the front of the display: The text on the left is ...
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1answer
478 views

7-segment display in VHDL?

So I'm currently writing VHDL code for a 7-segment display that will display (0-F) once each second. I have almost everything done, the only thing I'm stuck on is the controller. I need to have 4 ...