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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34 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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54 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 ...
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2answers
117 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 ...
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2answers
75 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 ...
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2answers
201 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 ...
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1answer
125 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
113 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
90 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 ...
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2answers
156 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
202 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
83 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
117 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 ...
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1answer
250 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
126 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 ...
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3answers
410 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 ...
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1answer
61 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
111 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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140 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 ...
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2answers
132 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 ...
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2answers
88 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 ...
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1answer
778 views

Control 4 digit 7-segment (2 digits number each) using Verilog [on hold]

How to program using verilog, where i want to control 4 digit 7-segment display, that will show 2 digits number for first and second 7-segment display, and the others with 2 digits number too. I know ...
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3answers
309 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 ...
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1answer
207 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 ...
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2answers
354 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
419 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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303 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
146 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
226 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 ...
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1answer
204 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 ...
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1answer
82 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
186 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
184 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 ...
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221 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
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1answer
252 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 ...
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4answers
451 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 ...
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1answer
213 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 ...
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339 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
437 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 ...
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2answers
239 views

Multiplex two I2C ICs into four 7 Segment displays

I currently have two PCF8574AN I2C 8-bit IO expander ICs. Is there a way I could have two seven segments be driven off one IC (So i could run four seven segments displays off the two ICs that I have). ...
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1answer
220 views

Alternative for MC14543B

I'm following a tutorial that use a MC14543B chip. The chip is defined as "Bcd-to-7 Segment Latch/decoder/driver" Datasheet is here: ...
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1answer
567 views

Are these LEDs glowing due to leakage current? How to prevent it?

I've been trying to develop this circuit for a multiplexed display with two seven segment digits and five SMD LEDs. For simplicity, I've only shown one digit (LEDS 1 through 7) and two SMD LEDs (8 and ...
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4answers
3k views

Displaying a 2-digit integer on two 7-segment display

I'm having trouble displaying a binary number into a display. I'm not sure of how to split a number in binary into its individual numbers. For example, if I want to display 25, I want to split this ...
3
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1answer
246 views

Seven segment display becomes dimmer as more segments are lit

I've got a common cathode, two digit seven segment display (LDD-N512RI-RA) hooked up to the GPIO pins of a microcontroller (Coldfire MCF52233 DEMO). The problem is that the brightness of the display ...
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2answers
541 views

How to control a seven-segment display with 4 digits?

I've taken this seven-segment display with 4 digits from a broken micro wave. Any ideas how to find out how it works? Finding an appropriate data sheet would be great.
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1answer
301 views

I'm driving a large 7-segment display using a microcontroller [closed]

I've seen that others are using TPIC6a596, a combo 74HC4511+ULN2003A, and also TLC5916. Just to confuse things more (for me anyways), there are also MAX7219 ICs that seem appropriate (maybe not for ...
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2answers
331 views

7 segment LCD works on breadboard, not on stripboard

I am using a 7 segment 3 1/2 digits "raw" LCD (like this one) using 4 CD4543 controllers and a MSP430. I use one of MSP430's pins to create a 30Hz square wave that I feed into CD4543's phase input. ...
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4answers
850 views

Need a LED Display

PROJECT: I'm building a Digital Clock controlled by a Arduino micro-controller. I want it to display the hours, minutes and seconds on a LED Digit Display. Therefore, I need to have several digits, ...
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3answers
294 views

Revolutions (pulse) per minute counter circuit?

Does anyone know how to set up a circuit by using counters, decoders, 7 segment displays and a 555 timer to show the revolutions (pulses) per minute from a photo-transistor? I'm doing this as part of ...
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2answers
587 views

Reverse engineering a 12 pin LCD?

I just found a broken "laser projecting alarm clock". I took it apart, and am interested in only the laser projection arm. This consists of a laser diode (although I suspect that this is actually just ...