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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8-bit BINARY for (3) 7-segment display using Shift and Add-3 Method

We have been told by our professor to create an 8-bit Adder-Subtractor and will display an output in decimal instead of just using LED's in Multisim. We know that in order to do this, we need to ...
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28 views

How to wire TLC59281 to a Raspberry Pi?

I have a 7 segment display that is driven by a TLC59281. How do I connect its pin to a Raspberry Pi in order to drive the display? Edit: It uses SPI interface. The datasheet can be found here.
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STM32 HAL VS dual 595 driven 7 segment display

I got this arduino shield with four 7 segment display what I'm trying to make work with STM32 nucleo. The displays are driven with two 74HC595 shift registers. I wrote the following code to control it,...
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74LS47/74LS247 BI/RBO-pin usage

I am currently playing around with a 74LS247 BCD to 7 segment decoder. The basic usage for decoding works perfectly fine. But I would like to test out everything this IC has to offer including the ...
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3answers
63 views

How to correctly address this three digit 7-segment display

I've purchased a mixed bag of random 7-segment displays and am trying to use a three digit 7-segment display marked as a "ELT-512HDB G C0019). For this I found the a datasheet with the pin ...
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36 views

Is this normal that pin 1 & 2 are shorted with HT1628 led display driver?

I just received from China, components to build my own induction cooker (yeah, I know it's strange but I want to add my own features on it ;-) ) and I'm a little disappointed with the build quality of ...
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80 views

7 segment display with given sequence [closed]

I need to design the 7 segment display which show the numbers of 1-7-2-9-0-2-0-9 with the flip-flops. But I can't make the karnough map because of the repeated numbers of 2-9-0. Can you help me with ...
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2answers
98 views

Slow turn-off time on PNP when driving 7 segment led

I know that there has already been question about optimizing PNP turn-off time, but my circuit is a bit different from that question so the solution presented there does not seem to work for me. Here ...
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71 views

Problem about number 2 display on the 7-segment display

Currently i am doing a project on blinking two LED at random interval of time and count the number of blinks in one minute. I encounter one problem which is when number 2 display on the 7-segment ...
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Verilog project - Binary to BCD - 0-49 2 digit display

I have an end of the year project where I must create an 4 operation ALU that outputs its result onto 7 segment displays in Verilog. 2 of those operations are multiplication and addition. Considering ...
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416 views

The circuit, especially 7 segment parts does not work at all

I made a circuit of experiment 19 from Make : Electronics 2nd Edition. It's called "time transitor." I made the first part of this circuit by referring the upper pictures, but when I connect ...
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259 views

32 bit to 7 segment display (FPGA)

After some research, I think I have quite a problem on my hands. I have a project on an FPGA where I store a 32 bit binary value in a 32 bit memory register. The stored value ranges from 0 to 4000 in ...
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Problem simulating transistor on Proteus

I'm using PNP transistor to be a switch for CC pin of 7Segment (Common Anode) led and trying simulating it on Proteus at first. Something weird happens is that no matter high or low level at B gate, ...
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118 views

Designing a electronic dice with Arduino, 74HC163 and a 74HC4511 decoder to a 7segment display

So im designing a electronic dice with a 74HC163 and the 74HC4511. My problem is that the counter counts 0-7 everytime (using only the 3 flip flop outputs, Q0-Q2) I would want the counter to count ...
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Drive a 4 bits 7 segments from ESP8266

After complex math and right wiring on my ESP8266, I finally light up my 4x7 segments display, one segment at a time. All the 4 selectors are connected to the 4 GND pins, so all four are lit up. Do I ...
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73 views

LCD substitute for 7-segment LED display? [closed]

For a project of mines, I use a 7-segment LED display, the SA52-11EWA, common anode. All OK, but the display is poorly visible outside, under the sun. Very annoying. So I thought to use an LCD display ...
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62 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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2answers
958 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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1answer
279 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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1answer
76 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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62 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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71 views

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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49 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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50 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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185 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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3answers
235 views

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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1answer
58 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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100 views

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
97 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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71 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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364 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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1answer
586 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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1answer
83 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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1answer
200 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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59 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
126 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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2answers
260 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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2answers
89 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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94 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
715 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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461 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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2k 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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221 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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2answers
509 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
299 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
714 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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