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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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How can I use a transistor to control the segments on this 7-segment display?

Pictured here is a 4-digit 7-segment display: Datasheet I'm designing this to have a microcontroller controlling it through a shift register (2, actually). The shift register doesn't have much power ...
Steam Ranger's user avatar
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1 answer
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7 segment display usage

The Digital trainer kit we are using has 7 segment display, I wish to use it to realise the output for the 3 bit counter. How exactly can I use it? Where to give inputs? I'm attaching the picture of ...
user14822524's user avatar
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2 answers
65 views

Seven segment display special characters/symbols [closed]

How can one add these symbols in seven segment displays? I would like to add some symbols of pwr,ch1,ch2,ch3 to my product. Does anyone know what this is called and who can do manufacturing of this?
funtastic rdj's user avatar
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2 answers
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Start counting from 1 and go up to 9 | 7-segment Display

so I have this circuit in Falstad that counts up to 9 (from 0 to 9) but I need to it to count from 1 to 9. In falstad I am using a counter, 7 segment decoder and a 7 segment display. Any thoughts on ...
Albii's user avatar
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3 votes
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Troubleshooting a HT16K33 + 14 segment LED showing segments when not addressed

I'm working with a board that has multiple 14 & 7 segment displays all being addressed using an HT16K33 where various segments are either not displaying or are being lit when they shouldn't. In ...
nageeb's user avatar
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Why is my 4digit 7segment display not showing all segments

My 4digit 7segment display is not showing all of the segments, the image is of it showing 8888. I have never used this display before and it has been lying around for a year or two does anyone know ...
Ghostboo124's user avatar
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1 answer
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Can single digit 7-segment displays use free digits from a multi-digit multiplexer?

The title's a bit convaluted, so I'll ellaborate. I'm driving a 4-digit 7-segment display with a multiplexing controller, the kind where it sets one display at a time and relies on persistence of ...
Steam Ranger's user avatar
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Scalable Voltage Display

I am trying to create my first PCB, and I am trying to measure and display scaled voltage and current output from a few different sensors on several seven segment displays. For example, one of the ...
tyster02's user avatar
-2 votes
1 answer
67 views

A question about the use of 4017 and ULN2003A [closed]

Can someone please help me understand the use of CD4017 AND ULN2003A with the 7-segment display?
Abir El Abdellaoui's user avatar
0 votes
1 answer
57 views

How can I implement my binary countdown from the output of JK flipflops to two seven segment displays from 15-0?

I am currently making a 2-way traffic stoplight. The stoplight signals are now fully functional. I have no idea how I can implement the 4 bits (not including my MSB because I just need to display 15-...
Yuan Marquez's user avatar
1 vote
1 answer
81 views

6 to 0 count down timer

I'm making a 60 second timer. I already made the 1st digit in my previous question. I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar ...
Noobielectrix's user avatar
0 votes
3 answers
99 views

74HC93 glitching problem

Solved: Apparently, on the 555, you need to connect pin #4 to VCC to avoid false triggering. (Thanks ericgibbs) I have a circuit that utilizes a 74HC93 4-bit counter. The clock signal for this counter ...
Michael's user avatar
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0 answers
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Unable to drive 7 segment 6 digits multiplexed display using 74HC595 and arduino

I have reverse engineered some existing circuit that was given to me which consists of a multiplexed 6 digits 7 segments displays driven by 2 darligton arrays and BD227 transistors. The original ...
floxia's user avatar
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2 votes
1 answer
130 views

Implementing 7-Segment Display Transitions [duplicate]

I'm working on a project that involves displaying the following words on three 7-segment -displays. A S U F O E C S E F U N Each word should transition to the next after a one-second interval (I ...
Michael's user avatar
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3 answers
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Words on 7-Segment Displays [closed]

I'm working on a project that uses three 7-segment displays. My aim is to show the words 'CAT', 'DOG', and 'FOX' using the 3 displays, one word at at time with a 1 second delay in between. To achieve ...
Michael's user avatar
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0 votes
3 answers
92 views

Why does adding this capacitor cause other segments to come on when they should not?

I have designed and built a clock, that uses a microcontroller to drive a 4x7 segment common-cathode display. Each digit is driven sequentially, with all appropriate segments of that digit driven in ...
Sod Almighty's user avatar
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2 answers
52 views

Current Consumption of multiplexed 7 segment

I have a display with an one digit 7 segment , I want to use a multiplexed seven-segment and my regulator can just support 150ma of current . Now my question is that. Is the current that the regulator ...
hossein hamzekhani's user avatar
1 vote
1 answer
130 views

7-segment 4-digit display ghosting

Currently I'm tinkering with my ADC project with my ATmega328. I asked my microcontroller educator how I can fix this issue with the ghosting. I thought it had something to do with frequency or the ...
DariShard's user avatar
2 votes
1 answer
116 views

Digits on 14 segment display are mirrored one to another

I have a synth device using 2-digit 14-segment display, a Mutable Yarns Clone. The PCB design is here. It uses an STM32F103CBT6. I flashed it via JTAG without any issues. the display is driven by a ...
Михаил Спирин's user avatar
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1 answer
160 views

ATmega328P ADC 4-digit 7-seg display

I've been trying to program an ADC with my ATmega328P, coding it in C++, it should show a 0 to 1023 value number, but it keeps showing random numbers when I move the potentiometer: 0001, 0039, 0014, ...
DariShard's user avatar
1 vote
0 answers
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Is it possible to display DHT11 on a 4 digit-7-segment with a PIC16f877A?

I'm trying to display the temperature of the DHT11 on a 4-digit-7-segment. I simulated it on Proteus and the result always equal to 0. I wonder if the way I used timer to display the LED affected the ...
stevievei's user avatar
1 vote
1 answer
106 views

Trouble driving 4 digit LED display with a MAX7219 display driver and a PIC16F690 MCU

I am attempting to drive a 4 digit, common cathode LED display with a MAX7219CNG display driver and a PIC16F690 MCU for SPI communication. The LED display does not light up and appears to not be ...
Pat's user avatar
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2 answers
240 views

How can I find the datasheet of this 7-segment display?

This is a 1-digit 56.80 mm 7-segment display. I don't know if it's common anode or common cathode. I got this because that was the only available option at that moment. This is the description of the ...
Line Follower's user avatar
0 votes
3 answers
117 views

Using an LDR and PNP transistor to automatically dim 12 V common anode 7-segment displays

I have designed and built a GPS time derived six digit digital clock using an Arduino. the digits are LED 2.3 inch common anode 12 V devices (because that's what I had!) and, after much work to drive ...
Mark Borchers's user avatar
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0 answers
124 views

Interfacing TM1640 LED driver with 7 segment display and PIC microcontroller

I have a customized LED display in which AIP1640 driver IC mounted on it and I think it's equivalent to TM1640. So does anyone have a working library for this driver? I want to interface it with ...
SUJIT MISHRA's user avatar
4 votes
1 answer
1k views

How do we control a 7-segment display with a rotary switch to ground and 12v supply?

I am currently trying to add a 7 segment display to my motorbikes gear indicator. requirements dictated by the bike: there is a positional switch to ground for each gear. If you think it's like a ...
Ashley Reid's user avatar
2 votes
1 answer
266 views

How to display 2-digits data using two 7447 decoder?

I have designed a circuit to display the 2-digits data using two 7447 decoder. The design is shown below. I have two outputs, O1 and O2. O1 represents the ones digit while O2 represents the tenths ...
CJ. T's user avatar
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1 vote
3 answers
82 views

7 segment display malfunctioning with ATmega8A

I am using an ATmega8A and want to take 8-bit input and display the corresponding binary in decimal form on three 7-segment displays but when I do it some unwanted segments light up dimly. What can be ...
Kalash Changal's user avatar
2 votes
2 answers
371 views

Undesirable dim light of LEDs on 7 segment display

I have a 7 segment display (common cathode) with 2 LEDs in each segment, powered by 12V, each segment controlled with a transistor (NPN) and Raspberry Pi 3.3V GPIO (and 4026 IC). What could be the ...
solari's user avatar
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1 vote
2 answers
73 views

Raspberry Pi Pico controlling servo and timer

I would like to create a program that uses a Raspberry Pi Pico, this four-digit seven-segment display, SG90 micro servos, and one of these buttons. My idea is that every time the button is depressed, ...
Vorde Vord's user avatar
0 votes
1 answer
77 views

Is there a convention for 7-segment display bit order?

I guess I have two related questions about bit-order conventions when addressing 7-segment displays from microcontrollers... Is there a convention for the bit order of the segments? Is there a ...
BenHead's user avatar
0 votes
5 answers
187 views

How can I maintain constant brightness in dual-color (red and green), 7-segment display with different voltage drop across each color?

I am designing an interface for a dual-color, common-cathode, 7-segment display. The schematic for the display looks like this: As you can see, the red and green LEDs are tied together at the anode. ...
Nathan's user avatar
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4 votes
3 answers
550 views

Problem with resistor for seven segment display

I am a novice and have a problem with my seven-segment display setup. Basic requirements: I need to control two seven-segment displays with buttons, without multiplexing, with the physically smallest ...
Xhiwar's user avatar
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0 votes
1 answer
83 views

PWM Generator Array

I want to use an AVR microcontroller to ultimately control an array of RGB 8-segment displays. The only relatively cost effective RGB 8-segment I could find was here, but it isn't common anode/...
kando's user avatar
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0 answers
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Seven-segment display pinout

Im working on a project with a 4-digit 7-segment display. The display is a FQY3042BUR-21 0916. I designed the circuit in Proteus and there were 8 data pins (a,b,c,d,e,f,g,dp) and 4 digit select pins(1,...
Line Follower's user avatar
0 votes
3 answers
434 views

Powering a seven-segment display and microcontroller

I have two seven-segment displays. Each display requires about 12 V to power and each segment of the display needs about 20 mA (so about 140 mA worst case scenario). I have everything working if I ...
namarino41's user avatar
0 votes
2 answers
425 views

How to add multiplexer to my circuit to drive 7 segment display every 10 seconds from 2 different inputs alternately

I've been working on this project and got stuck at a problem in my schematic. I want to display the temperature and the count from the counters alternately every 10 seconds. In other words: display ...
Zipho Lunika's user avatar
4 votes
1 answer
465 views

How to drive 7-segment LED display directly from MCU without current limiting resistor?

I traced the PCB of ZK-MG Motor governer and found that it drive red 7-segment LED display without any current limiting resistor. I know it possible but (Q1)which technique does it use? and (Q2) Does ...
M lab's user avatar
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2 votes
2 answers
307 views

Turning on an alarm after counter reaches 99

So I'm working on a 2 month design project with the following description I'm trying to exhaust the possible ways to design this without using microcontrollers or ready-made chips. Some of the ...
Zipho Lunika's user avatar
4 votes
2 answers
228 views

How best to perform calculation on voltage and feed output to segmented display?

I'm working on an audio electronics project that uses frequency modulation. A potentiometer will control the tempo/modulation speed, and I'd like to convert the voltage value to a triple-digit value ...
Gabe Fernandes's user avatar
-1 votes
2 answers
227 views

NPN transistor not emitting anticipated voltage [closed]

I have 12 V connected to the collector of an NPN transistor. I have a pin of an ESP8255 (which emits 3.3 V) connected to the base. I'm trying to power a 7-segment display with it, but the emitter ...
namarino41's user avatar
2 votes
1 answer
298 views

7 segment display dimmed when off

I have a 7 segment display with a common anode which takes around 12 V. There's a 330 Ω resistor connecting each data pin to an ESP8266. To display each number, I'm just tying the requisite pins low. ...
namarino41's user avatar
3 votes
2 answers
1k views

What is the correct way to connect resistors to a common-anode seven-segment display with a microcontroller?

What is the correct way to connect resistors to a seven-segment common-anode display with a microcontroller? Where should I connect a resistor? Here I am connecting a common anode display (common = +5 ...
Rahul.In's user avatar
1 vote
1 answer
342 views

Why is my 7-segment display not working when output modules (O3-O0) are connected to BCD to HEX converter module?

I have used an 8051 interfaced with an 8255 taking inputs from port A and port 1 and showing the output from port B AND C of the 8255. I also made a decoder for BCD to HEX (0-F). The input value is ...
Kakashi Hatake's user avatar
2 votes
3 answers
659 views

What are the considerations of using a common anode 7-segment display over a common cathode?

Common anode: Do I need resistors here? Where would I connect them? Common cathode: Common anode seems simpler circuit wise - but I like the idea that "1" represents "ON" that ...
NonComposMentis's user avatar
0 votes
0 answers
113 views

Connecting a 7-segment display to a CD4543B decoder

I would like some help connecting a 7-segment display to a CD4543B decoder according to the instructions in the image at the bottom, and get the display to show the expected numbers. How is it ...
bittscoterie's user avatar
1 vote
1 answer
120 views

Why does the up down counter with 7-segment simulation always show X output? [closed]

Why does the counter output remain unknown (x)? I expect the counter to increment. ...
eg huaxin's user avatar
2 votes
4 answers
818 views

0 to 999 Hz frequency counter

I'm trying to build a frequency counter with a resolution of 1 Hz that will count any frequency between 0 and 999 Hz and hold that value. I've built the following in Multisim but I'm having trouble ...
Licentia's user avatar
1 vote
2 answers
404 views

D flip-flop circuit to show nine hex numbers alternately on one seven-segment display

I tried to make a circuit with a D flip-flop to show a hex number of F1D021301 alternately on a single seven-segment display, but it can only do F1D02130 or F1D0213 and return back to 0 and repeat to ...
Chingu Dev's user avatar
0 votes
0 answers
73 views

7 Segment display loops back to 9

I am trying to figure out why the 7-segment display at the top part loops back to 9 when the timer reaches 0. I want the timer to display 0 whenever it stops. What kind of adjustments should I make to ...
Justine Ogapong's user avatar

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