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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153 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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2answers
408 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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1answer
339 views

Reducing ground level fluctuations when Multiplexing 7-Segment Displays

I am using a microcontroller to multiplex 6x 7-segment displays. Segments are driven by 2N3906’s and displays by a ULN2003. Average segment current is around 9mA, so instantaneous LED current pulses ...
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Constructing Excess 3 BCD to 7 segment decoder - circuit hints needed

I am currently trying to construct a circut for an Excess 3 BCD to 7 Segment decoder. Therefore the input range ranges from 0011 to 1100 in binary inclusive with the rest of the inputs being don't ...
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51 views

BCD 7447 powered by 7805 drops voltage

I am trying to use a BCD converter 7447 to display numbers on a seven segment display. Even before I apply any inputs or outputs, I observe that the VCC voltage of the 7447 drops (which is powered by ...
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1answer
52 views

Terminology for components found in Kitchen Timer

Apologies if this is a duplicate, by definition I'm not sure what to search for. I took apart a kitchen timer and found a few things I'd like to learn about, but couldn't find the right terminology to ...
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49 views

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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41 views

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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101 views

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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1answer
87 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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1answer
43 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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Clock Frequency for 4 digit 7 segment display in VHDL

I am using basys 3 and VHDL to create a stopwatch and I need to do it for both the 7 segment display of the basys3 itself and for a external 4 digit 7 segment display. I am given the clock divider ...
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392 views

power supply noise causing resets of MAX7219 LED driver

I have wired up an ESP8266 wifi uC to a MAX7219 7-segment driver. The setup works well, except that the circuit seems susceptible to external noise. The main issue I have noticed is that activating a ...
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798 views

Problem Refreshing 4-digit 7-segment display with UART on the MSP430G2553

I'm working on a program that: samples the ADC every half a second with timer interrupt sends a signal via UART on button press (port 2 interrupt) displays the ADC value to a 4-digit multiplexed 7-...
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1answer
3k views

7-segment display in VHDL?

So I'm currently writing VHDL code for a 7-segment display that will display (0-F) once each second. I have almost everything done, the only thing I'm stuck on is the controller. I need to have 4 ...
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30 views

How to test bench the seven segment correctly using ghdl?

I am trying to make a working test bench to this 7 segment, i am a student so i don't know a lot about vhdl, i was asked to do this task. ...
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49 views

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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1answer
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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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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108 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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97 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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141 views

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
52 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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45 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
76 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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556 views

7-segment decoder RBI/RBO pins

I know that RBO/RBI pins are used to blank leading zeros in a multi-digit display, but I've never used them once. How do they work? I mean If I ground an active low RBI pin, does that automatically ...
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1answer
180 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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1answer
402 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 ...