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 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
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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
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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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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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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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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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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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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
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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
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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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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
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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
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1 answer
86 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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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
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3 answers
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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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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
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1 answer
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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
192 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 ...
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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
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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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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
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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
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5 answers
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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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Understanding the RAM address of a 7 segment 4 digit display (HT1668)

I've salvaged a 7 segment display and I comes with an ht1668 driver IC with half duplex SPI for communication. I was reading the datasheet and understood the communication side, but couldn't ...
chethanRaj's user avatar
4 votes
3 answers
521 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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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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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
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3 answers
319 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
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2 answers
278 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
319 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
293 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
225 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
207 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
296 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
282 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
555 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
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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
118 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
715 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
365 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
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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
1 vote
2 answers
158 views

Is BCD to 7 segment display a decoder or a driver?

In my book it specifically says that for decoders only one output is high for combinations of each input. And also the number of outputs are 2 power of number of inputs. None of these are true for BCD ...
Jack's user avatar
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How do I connect a D flip-flop to a common anode 7-segment display?

I have a circuit in which I have an SN74LS175N D flip-flop, which outputs Q and Q’, and an INND-TS40Y6AB common anode 7-segment display. My goal is to make it so that when Q is true, only the “a” line ...
alejanndro's user avatar
2 votes
1 answer
85 views

Reset of TM1638 display driver

I am trying to run a TM1638 display off the 6-pin program header of an ATMEGA328P that uses pins PB3, PB4, and PB5. The screen works fine, but the programmer works only if the screen is not connected. ...
Jay Dee's user avatar
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2 answers
340 views

Unable to display entered digits via KEYPAD-PHONE in Proteus correctly

I've started doing some project that includes displaying entered digits via keypad phone in Proteus. I'll leave a screenshot below, so this post doesn't look undefined. You've probably seen this ...
schottky diode's user avatar
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Activating an Active Buzzer from PWM Signal of an LED driver

I would like to turn on an active buzzer TMB12A05 using the decimal place output channel of a TM1638 display driver that is designed to drive LEDs using a PWM signal. I considered using a passive ...
Jay Dee's user avatar
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-2 votes
2 answers
508 views

How do seven segment displays show black numbers?

Usually, seven-segment displays emit red coloured light, which is understandable. But in digital watches, the common colour used for the numbers displayed is black. But black light itself can't be ...
Balu's user avatar
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2 votes
2 answers
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How do you cascade two 7-segment decoder ICs together?

We used one 74LS47 IC in our lab, which we connected to a 7-segment display and tested the outputs. Now our instructor has told us to cascade two 7447 ICs together and implement it on a 7-segment ...
Bukharian1776's user avatar
2 votes
0 answers
277 views

Reading 2 digit 7 segments with ESP32 using TM1650 maybe?

I have been trying to contact a forum member that has done a modification to his pool equipment in order to control it remotely instead of having to go to the box every time and check on the codes. ...
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