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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34 views

Soldering Header Pins Together to Multiplex Single Digit 7-Segment Displays

To multiplex two or more single digit SSD’s, each corresponding pin must be connected to that of the other displays, such as in this schematic. I’ve accomplished this with 4 displays by using a ...
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4answers
218 views

74HC4094 vs 74HC595

I'm planning a large display board where I'll have to display 150 7 - segment digits. Which shift register is preferred here? 74HC4094 or 74HC595 or something else since I'm planning to chain these ...
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Displaying 6 bit numbers on two 7-segment displays

I designed 6 bit binary adder which should add two numbers in first complement. The numbers are being input via registers. I have to display the numbers and the result on two 7-segment displays via ...
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41 views

Read serial data from unknown source using Raspberry pi

I have a fuel dispenser, which has one keypad and two displays, each display has three of 7 segment LCDs. I want to control the fuel dispenser with a PC or a phone. The way to do this in my knowledge ...
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56 views

received data through UART showing on 7 segment display using ATmega16

I am writing code for Atmega16 for receiving data from another PCB through UART. I want to display the data on a 7-segment 4-digit display, but when code for UART and 7-segment is enabled the data is ...
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36 views

pausing d flip flop output

I want to make a digital timer that counts to 99 minutes 59 seconds the problem is that i want to use 4 digit 7 segment display so i have to oscillate the input of the bcd to 7 segment display between ...
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2answers
67 views

How do you make a digital counter circuit which counts to 10 minutes and 15 minutes, it will give a signs buzzer? [duplicate]

I asked in this site before, but apperantly I don't quite understand. I want to make a digital counter circuit which it counts to 15 minutes for my big project in my campus . When the circuit counts ...
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136 views

How can I make a 10 minute and 15 minute buzzer timer? [closed]

Basically, I have a big project going on in my campus which we were told to make digital counter. So when the timer counts reach at 10 minutes (by this case, the timer counts is shown by 7-segment ...
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70 views

Correctly driving dual 7-segment display

After receiving some feedback on my other question, I have improved my design. I am still using a stm32f030k6 to drive a two-digit 7-segment display, but I am using the common-anode HDSM-291C in ...
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82 views

Powering LEDs through microcontroller pins and transistors

I'm working on my first ever PCB, and would like to include two 7-segment displays. The device will be powered from mains, so power consumption is not an issue. I have chosen the Broadcom HDSM-293L, ...
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3answers
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Replace/refresh 7 segment display of vintage 80's clock radio

Past two weeks working on this clock radio because I love the looks of it and it is also pretty rare (it must be restored in original condition or better). Fixed almost every non-working feature such ...
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4answers
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Why does the seven segment display have decimal point at the right? [closed]

All the seven segment displays I’ve seen so far have their decimal point to the right of the main digit. Why is this so? A decimal point to the left will be able to represent more possible ...
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Implementing Moores or Mealys State Machine to display different numbers in 4-Digit 7-Segment Display using VHDL

Ok so i am here again, i posted this question some hours earlier and the answer was to use a state machine in order to achieve it. Now the the question is how do i implement it. I would like it to use ...
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1answer
103 views

Displaying different numbers in 4-Digit 7-Segment Display using VHDL

I am trying to display 4 different numbers on my display. Currently I am using a dip switch to input the number and displaying the same number in all of the digits. ...
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1answer
434 views

Seven Segment display VHDL code issue [closed]

i am trying to use a seven segment display to show the numbers 0 to 9, using BCD and the dip switch the FPGA Board includes to determine the High and Lows. I found some relevant code but, my FPGA has ...
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2answers
136 views

How can I code in a buzzer while using a 7-segment in an 8051

I'm currently working on a small queuing system where whenever someone presses a button (which I have linked to INT0), my 8051 would increase the register and would display a higher number on the dual ...
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174 views

7-segment LED display max current

I have a simple question, but cannot find the answer anywhere and the datasheets are not very clear. Each 7-segment display have maximum current per segment. If this current is 40mA, single digit ...
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1answer
99 views

Why did the 74xx family never have a hexadecimal to 7-segment-display chip? [closed]

The 74xx family of TTL ICs has several BCD to 7-segment-display chips, such as the 7446-7449, which could display digits 0-9. However, there does not seem to have been a hexadecimal to 7-segment ...
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1answer
152 views

How to assign different pins in Pin Planner in Quartus?

I am trying to make the 7 segment display of my FPGA work. I found some working code, but I got issues with the pin planner. The FPGA is this, a knockoff Altera Cyclone IV E EP4CE6E22C8. The code : <...
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127 views

How is the common anode 7-segment display in Ben Eater's setup working?

First question in this community, and I'm a beginner when it comes to circuits. In Ben Eater's video on using an EEPROM for combinational logic, he uses the output of an EEPROM to drive a common anode ...
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1answer
30 views

CD4543B Direct LED Driving Capability

I bought some 7 segment decoders specifically the CD4543B and the datasheet https://www.ti.com/lit/ds/symlink/cd4543b.pdf mentions "Direct LED Driving Capability" Does that mean I do not have to use ...
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135 views

Keypad saved shifting display using Verilog

I'm designing a number exchange module, and so far I've been able to make it display on Seven Segment Display (S-S-D), like if I press 0 it shows 0... etc. I'm using 2 sets of 4-bits S-S-D (Common ...
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182 views

Multiplexing common anode 7 segments using only 2 shift register, darlington array, and transistor

I'm trying to multiplex up to 8 digit common anode 7 segment display using only 2 shift registers chained together in series driven by arduino. So it would need only 3 pins (trying to save up pins ...
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1answer
225 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. ...
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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 ...
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28 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 ...
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81 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 ...
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1answer
124 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 ...
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4answers
147 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 ...
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1answer
112 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 ...
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2answers
237 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 ...
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3answers
423 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 ...
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114 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
171 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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44 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
88 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 ...
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1answer
75 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
495 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
87 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
245 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
66 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 ...
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1answer
218 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
204 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
195 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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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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633 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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84 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
169 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
1k 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
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

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