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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.

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Displaying value on 2 line 4 digit 7 segment code [on hold]

I have using arduino Uno . I have used serial in parallel out to display the parameter. Here i am pasting the piece of code. Totally i have 8 digit of 7 segment display.Dissect & Dissect2 split ...
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3answers
86 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 ...
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1answer
91 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 ...
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0answers
37 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 ...
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1answer
60 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
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1answer
46 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 ...
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1answer
57 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 ...
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1answer
55 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 ...
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1answer
46 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, ...
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1answer
40 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 ...
0
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1answer
58 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 ...
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2answers
91 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 ...
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1answer
62 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 ...
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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&...
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2answers
217 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 ...
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0answers
100 views

TM1637 transistor led strip 12V

I wanted to ask you a question. I should go to control the led strips starting from a signal generated by an integrated ... The integrated in question is the tm1637 this normally goes to drive a 7-...
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1answer
65 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). ...
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4answers
144 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 ...
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2answers
562 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.
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2answers
886 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
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3answers
223 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
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1answer
405 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 ...
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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 -...
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1answer
331 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 ...
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10answers
6k 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 ...
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1answer
75 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
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3answers
92 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 ...
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0answers
624 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 ...
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1answer
116 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. The following schematic I drew in Logisim, and it works, but it is a ...
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4answers
233 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 ...
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1answer
221 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 ...
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4answers
185 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
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1answer
123 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
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1answer
560 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 ...
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2answers
3k 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
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1answer
630 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
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2answers
241 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
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2answers
761 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 ...
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0answers
75 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 ...
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1answer
225 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
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2answers
70 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 ...
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2answers
426 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 ...
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1answer
48 views

Create time counter with display with capacity for several hours

I am rather new to this and as part of a hobby project I'd like to end up with a simple display showing a time counter. Starting at 0 and going up from there, being able to support several hours (so ...
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3answers
942 views

8 bit code in 7 segment display without splitting into four bit [closed]

How to connect two 7 segments display to display 0 to 99 number by sending 8 bit code ( without splitting code into 4 code ) using 7447 ic?
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0answers
400 views

7-segment decoder RBI/RBO pins

I know that RBO/RBI pins are used to blank leading zeros in a multi-digit display, but I've never used them once. How do they work? I mean If I ground an active low RBI pin, does that automatically ...
0
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1answer
169 views

What is the minimum number of lookup tables needed to implement a decade counter connected to a 7 segment display? [on hold]

I'm a student, new to thinking of digital circuits in terms of lookup tables and I'm having trouble working out this problem, in fact I'm not sure where to start. Can anyone help? The maximum number ...
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1answer
556 views

How to drive a 9V common cathode 7 Segment using Arduino and transistors?

I want to make a 4 digit timer with 9V CC 7 segment using arduino. I tried the circuit below to switch the segments. simulate this circuit – Schematic created using CircuitLab The segments ...
0
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1answer
286 views

One digit on seven segment display not working

So I have a circuit using the 4510 and 4511 chips as well as 3 seven segment displays on a PCB (designed and created). What it is meant to do is count up to 9.99 in 1's, 10's and 100's by cascading ...
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3answers
491 views

Detecting Switch input in ARM 7 and multiplexing two seven segment displays

I am trying to multiplex two seven segment displays, once a switch input is detected. If a switch is pressed then the seven segment displays should show 1 If ...
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2answers
777 views

Two multiplexed 7-segment displays flickering

I'm working on a temperature sensor. I've got: LM35 (Sensor) LM741 (Op-amp to amplify LM35 Vout to 5V) PIC 14F458 The temperature is shown on two 7-segment displays with only one BCD converter (...