Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [7segmentdisplay]

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.

2
votes
1answer
150 views

Making a lock system with a 7-segment circuit

I got an assignment in my university to create a lock system using a 7-segment LED, a 7-segment decoder IC and a bi-color LED. The idea of the assignment is that the password is stored somewhere. ...
0
votes
0answers
56 views

Why my multiplexer doesn't active multiple 7 segments at one time?

First I made a clock divider at VHDL. Then I made a counter based on it. After that I made a multiplexer and I activated one seven segment in each selection case. The selection case of multiplexer is ...
0
votes
1answer
20 views

Using port 0 in AT89C52 without pull up resistors

So at my university professor gave us following scheme to program this double 7 segment display on the right. At start I tried to simply adress it using P0=(someData) although it didn't work. Then I ...
0
votes
0answers
37 views

Max7219 segment drivers output voltage is lower than expected

I'm using a max 7219 to control 7 highside drivers (which provides power to two higher voltage common cathode displays). The components on my breadboard are connected according to this schematic: The ...
0
votes
1answer
79 views

how to display an output variable from a speed sensor to a 7 segment display in C. DSPIC33E

I have just started an electrical engineering degree and been set an assignment to create a closed loop motor speed control system in C programming language. The PIC is a DSPIC33E (BLO032) and the ...
0
votes
4answers
100 views

TTL Logic for displaying large 7-segment values [closed]

For fun, I was trying to imagine how I might implement large values in 74 series logic (or any commonly available discrete logic from the 1970s). An example might be displaying prime numbers up to ...
0
votes
1answer
103 views

Connecting 7-segment display to microcontroller

In the above circuit, what is the reason of connecting transistor to 7-segment display? What's the difference between the two display with transistors and other two with only resistors? Also ...
0
votes
2answers
120 views

Building a BCD to 7-segment using 3x8 decoder

So.. I know how to build a BCD to 7-segment using 3x8 decoder but the question provides 4-digit binaries and asks to only input 3 of those.. my question is that won't two different digits be regarded ...
1
vote
3answers
160 views

How to connect DIP switch in a circuit? [closed]

simulate this circuit – Schematic created using CircuitLab I am trying to make a BCD to 7 segment decoder, but I can't make it work. I have a 7 segment with a common anode and I have connected ...
0
votes
0answers
238 views

Simulating a 7-segment 4 digit display in Proteus using Atmega16

I have an issue about simulating a 7 segment display in Proteus. So basically, I am using an ATmega16 microcontroller along with a ULN2803 transistor array. I connect the 7 segments + decimal point ...
0
votes
3answers
99 views

How long can an LED withstand its rated peak current?

I am working with several 7 segment displays HDSP-F103. According to the datasheet, each segment has a peak current of 45 mA, but it doesn't specify for how long in time or in PWM duty cycle. It does ...
2
votes
1answer
122 views

MAX7221 not always powering on

I have a MAX7221 SPI 7-seg. LED driver linked to an AVR168P microcontroller. Sometimes when powering on, everything works as expected. Other times the display blanks and remains blank. Other times ...
0
votes
0answers
43 views

how to show a bunch of numbers one by one on a seven segment display

The question is on the title. I just need a starting point like should I draw first the state diagram? I need to show the 150707926 on one seven segment display one by one by using logic gates. Thanks ...
1
vote
1answer
65 views

Difference between driver and transistor

I asked a question earlier question, "Is it safe to run Logic ICs at their maximum output current?" asking if it was safe to run logic ICs at their maximum current. From what I understand, this is ...
3
votes
1answer
62 views

Timer activated by Reed on AC solenoid

Let me start by saying thank you for taking the time to read this - I really appreciate it! To the point: I am trying to create a 2-digit timer that resets and then starts at the activation of an ...
0
votes
1answer
279 views

How can I convert binary into multiple 7 segment displays [closed]

I've been trying to make a decimal calculator using binary adders that feed into 3 x 7 segment displays. I cant find an efficient way to do this. If someone could point me to the correct resources, or ...
0
votes
1answer
65 views

Issue with 7107 IC

I am having trouble with the 7107 IC. I have 5 of them on my PCB: 3 being used as current measurement and the other 2 are being used as a voltage measurement. Only one of the 5 are displaying ...
0
votes
1answer
98 views

7 Segment Display Segment C Kmap Confusion

I am working on the Kmap for the Segment C on the 7 Segment Display. The list of numbers that light up the 7 segment displays segment C are as follows: The Kmap I came up with, without grouping yet, ...
0
votes
1answer
54 views

7 segment display

i recently bought a 7 segment display for research purposes. I have connected this to the raspberry pi and i got an output. The thing is that, the segment has 4 digit display and all the displays show ...
-1
votes
1answer
121 views

74ls148 to 7447 to 7-segment connection. Why is it showing output 0-7 only

We have a project that requires the use of comparators, 74LS148(For Flash ADC), 74LS47 and a 7-segment digit display to show numbers 0-9. The problem is that it only shows an output of 0-7 in the ...
0
votes
2answers
121 views

7 Segment display driver

I came up with the circuit below to drive a single 7-segment display from an Arduino via a shift register (74LS595). Is the circuit correct/good enough or am I perhaps missing something critical in ...
1
vote
1answer
98 views

LED display flickering when connected to an ESP8266

I'm building a simple clock using an ESP8266 chip and a 7 segment LED display which is driven by a HT16K33 chip. The ESP8266 uses 3.3V, the display can handle 5V. I want to use a simple USB cable as a ...
17
votes
2answers
2k views

Seven-segment display seems to draw little current

I bought a 1.8-inch seven-segment common cathode LED display from AliExpress. So no datasheet available. I used a 1 kΩ resistor and a 5 V source, as to put a max 5 mA in the LED. I measured 1.6&...
0
votes
2answers
335 views

circuit ~ 7 segment display number didn't run in order

I am doing a simple 7 segment display circuit using ne555,74ls90 and 7447 ic I connected everything up but the number run 0,2,4,6,8 and did not go to 1,3,5,7,9 and continue... what is the main problem ...
0
votes
1answer
73 views

Move 7 segment display off board, how?

I bought a relay that has a 7 segment display on it. It's placed "incorrectly" according to what I need so I want to move it off the board as simple as possible. (Because I'm not that good at this). ...
0
votes
4answers
152 views

Making a counter that goes from 1 to 6

How do I make a counter that goes from 1 to 6? I have a 555 Timer connected to a 74LS390N counter which is connected to a 7 segment display module. I can't figure out how to make the counter's output ...
-1
votes
2answers
758 views

Pinouts of 4-digit Seven Segment Display! [duplicate]

I have a display as in photo I sent you. But it has no label so I can't get data sheet. It has seven pins only. How to know its pin configurations? Please help me.
0
votes
2answers
2k views

HEX to 7 segment decoder for a common anode 7 SEG display [duplicate]

is there any integrated circuit HEX to 7 segment decoder for a common anode 7 SEG display that generates codes to display hex digits from 0 to F as shown in the photo. Thanks
0
votes
3answers
281 views

How to convert 9 bit binary to BCD for 3 Seven Segment Displays

I have been learning logic gates and binary so I made an 8-bit addition and subtraction calculator. When I add or subtract, the output is 9 LED's in regular binary. I have researched ways to convert ...
0
votes
1answer
646 views

7-segment display BCD decoder with normal hex values [closed]

I'm trying to find a 7-segment display BCD decoder IC with normal HEX display. Most of the decoders that I managed to find have an output like this: These hex values just look awful. I previously ...
0
votes
2answers
131 views

Is it safe to apply a voltage to a cup of water, and then use the water in that cup as a voltage source for other electronics?

From research it appears that water level detection circuits, such as the one I have included below as a diagram, work on the principle that when the water is high enough to submerge both the +ve and -...
1
vote
1answer
438 views

How to use a double 7 segment with atmega32

I'm learning Embedded Systems and how to use ATMEGA32 MCU. Now I'm trying to display a fractional number to the 7 segment but it just won't display! But if I move the handle of the potentiometer -The ...
5
votes
10answers
7k views

7 segment binary to hex

I'm trying to display a 4-bit binary number on a 7 segment LED as a hexadecimal number (0-F). I have an assortment of 7400 series ICs including the 7447. But that one only works for BCD (0-9). The ...
-1
votes
1answer
87 views

7 Segment Dual Common Anode Connection

I just received this item and I have tried to connect it but I cant seem to find anywhere datasheet for this as all tutorials I have seen, the connections are at the bottom and at the top and in this ...
0
votes
3answers
93 views

How would you search for this type of screen?

I have this cooking thermometer with a very small screen. For my DIY projects I'd like to buy some of these screens in bulk (say 10 or 20) and use them with arduino but I can't find a proper name to ...
1
vote
0answers
726 views

Clock Frequency for 4 digit 7 segment display in VHDL

I am using basys 3 and VHDL to create a stopwatch and I need to do it for both the 7 segment display of the basys3 itself and for a external 4 digit 7 segment display. I am given the clock divider ...
1
vote
2answers
183 views

Improvements to 7-segment decoder

I am just learning to build circuits, and I thought I would try my hand at building a 7 segment decoder using just logic gates. I drew the following schematic in Logisim, and it works, but there ...
-1
votes
4answers
318 views

Sn74ls47N chip not working in this setup

So for electronic engineering we have to make a basic bcd to decimal decoder, and an Sn74ls47N was provided as a decoder, and the 7seg being like any other standard 7seg. Me and my buddy have it wired ...
1
vote
1answer
245 views

Is my 7 seven segment Common Anode or Common Cathode

I am making a stopwatch, i bought a common cathode 7 segment and i installed resistors gave ground(-ve wire of battery) to pin 3 and positive to each segments including DP but i didnt glow, after that ...
0
votes
4answers
206 views

Simple transistor switching circuit

What should I do to the circuit: so that the LED is lit. Multisim file I know Q1 does not have ground nor is the VCC connected to the Q2. The above is part of this commercially sold driver board ...
0
votes
1answer
163 views

Reducing ground level fluctuations when Multiplexing 7-Segment Displays

I am using a microcontroller to multiplex 6x 7-segment displays. Segments are driven by 2N3906’s and displays by a ULN2003. Average segment current is around 9mA, so instantaneous LED current pulses ...
0
votes
1answer
880 views

4ِ-bit adder in Multisim

I want to design a 3-bit by 3-bit number adder circuit. The result must be in BCD. And I want to show the result by using 7-segment displays. I built this circuit. I'm not sure from it, and when I ...
0
votes
2answers
4k views

8-Bit Binary to BCD Decoding for Three 7-Segment Displays

I've created a circuit that uses both binary and BCD counters to convert an 8-bit binary number into three BCD numbers, which then feed into BCD to 7-segment decoder chips, and finally to common-anode ...
2
votes
1answer
910 views

Driving a Strange 12-Pin, 7-Segment, 4-Digit LCD display

I am putting together a project that requires a 4-digit numeric display and wound up ordering this. Unfortunately, something I completely failed to notice when ordering the LCD was that its pin ...
2
votes
2answers
244 views

Display 7 segment HDSP-N101

I'm new in electronics and I have a doubt. Recently I bought a 7 segment display to practice with Arduino, but I don't know how it works. I have searched at the Datasheet: I suppose that my display ...
0
votes
2answers
1k views

7 segment led light up specific decimal point

I have a 12 pin 7 segment led (ATA8041AB) which is working fine using my code, it just that when I try to light up the decimal point led, it either light up all dp or dont light up at all. here is ...
1
vote
0answers
80 views

Reading multiplexed or charlieplexed display, is it possible and how?

What I try to do is reading a 7 pin display with 35/36 segments/LEDS. I want to do this to know what the device is doing. Why? Because I want to know I can do it (it is possible anyway) and to be able ...
0
votes
1answer
283 views

Where can I find a datasheet/info of/on this “music speakers” 35 segment LED display with 7 legs?

Bought some "music speaker" thingies, some with bluetooth and some without. They are cheap, for sure, about 3 or 4 euro's. With some capacitor tweaks, they seem to be very plausibel to use (why is the ...
0
votes
2answers
89 views

Max amps/volts for a 7 Segment LCD

I recently bought this LCD screen for a project: https://www.jaycar.com.au/4-digit-field-effect-lcd/p/ZD1886 This LCD screen is just for testing at the moment, the final project will use these (I ...
1
vote
2answers
569 views

Having an issue connecting two 4-bit Synchronous Up Down counters

That's a Traffic Light circuit I designed on Multisim. I used 2 74LS191 Counters, 2 74LS47 Decoders, 2 Seven Segment Displays, a 555 timer and a J-K flip-flop as you see. It should count from 29 down ...