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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52 views

Way to connect test points on circuit board when both sides of board must be accessible?

I have a commercially made circuit board with multiple 7-segment displays (HSP-H103) soldered into it. I need to test the displays to make sure all of the segments work for each one. The problem is ...
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Help with 7 seg LED design (ws2811)

Upon review of the design below, I noticed that the MOSFETS are in fact P-Channel and utilize a pull-up resistor. That orientation will only provide a current path when the signal from the WS2811 goes ...
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106 views

How can we multiply two 2-digit BCD numbers?

I am designing a PIC18F4520 microcontroller based system. By using this system I want to multiply two numbers. Each number is a 2-digit BCD number. Such as 73*27 and I want to see results as 2715 at a ...
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82 views

3 digit of 7-segment on logisim [closed]

I'm working in a project, which will show an arithmetic result as a 7-segment, I know how to do a one digit 7- segment on logisim, but this makes the result limited from 0 to 9, and my project ...
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53 views

How to use TM1637 on a PNP driven 7 segment display

I am trying to get this 20-year-old board working again for a few days now, constantly feeling I am close to the solution, but I can't get it to work. The segments Led[3..5] are wired to connector P3 ...
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53 views

Addressable like 7-segments number display

Scenario I'm planing to start a project that is a number display. It consists in 2 components: The controller: a smart component that knows which number to display The (single) digit: it display a ...
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63 views

What components do I need to display an analog DC current value on a 7-segment display array?

(See edit below) Original Question: This is the first PCB I've ever tried to build and I need a little help getting pointed in the right direction. I've spent hours researching things and I think I'...
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How to apply if-else condition of inputs and display the output on 7 segment display on Proteus

I am fairly new at using Proteus. This is my second time using it. This is not a homework question. I am trying to figure out, if i have 7 doors leading to a vault and 2 are main doors, 5 are internal ...
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35 views

Driving two 7-segment displays with a single shift register and BJT transistors

I'm building a circuit containing 8 switches representing 8 bits in a byte. I have two single digit 7 segment displays to display the two hexadecimal characters that represent the byte value. I'm ...
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1answer
45 views

How to drive segment display and sens button press at the same time? Understanding this schematic

I have a very simple board that has been designed by the Italians back in 2001. It has 3 7segment common anode displays, 2 buttons, and a few LEDs. I have to interface with it but I don't know how it ...
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2answers
171 views

How to create a short circuit

I am doing a personal project to learn a bit about electronics but I do not have much prior knowledge about it. I am using a STM32L476RG microcontroller, a 3 digit seven segment display (common ...
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I am designing a 7 segment display but I am finding it a little bit hard to associate them

I am new in this domain and I want to design a 7-segment display from 0 to 9 and then from A to F. I made the truth table composed of 4 inputs and 8 outputs each output for the corresponding pin of ...
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54 views

How to display 20 2-digits numbers?

I'm working on something where i need to display 20 independent 2-digit numbers that are located in different places. In current prototype there are 20 extruded in plastic numbers with led backlight. ...
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7 segment display issue

I had a 7 segment, 4 digit display hooked to a very large board with et6226m (similar to tm1650), so i decided to desolder and pack it by putting the driver in between the 12 pins of display. Tested ...
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3answers
83 views

7-segment resistors

I am building display using this 7-segment module with following setup. I have problem with understanding 7-segment datasheet. According to the table typical forward voltage per segment is 8 V at 20 ...
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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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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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171 views

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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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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85 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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1answer
43 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
89 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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186 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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76 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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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
361 views

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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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
173 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
966 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
175 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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246 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
154 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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274 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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2answers
181 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
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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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1answer
157 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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1answer
242 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
257 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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1answer
42 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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1answer
142 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
162 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
121 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
349 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
612 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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130 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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208 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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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
105 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
95 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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