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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51 views

Displaying a 4-bit ALU result as 3 digits [on hold]

I have managed to design (using Logisim) a 4-bit ALU that adds, subtracts, multiplies and compares. Everything seems to be working fine. However, I am having trouble figuring out how to display the ...
3
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1answer
91 views

Display Double Digit Numbers on 2 seven segment displays

I'm making an Arithmetic Logic Unit(ALU) for an assignment and I'm on a point. So according to my circuit design on the link shared below, I am able to output 1 digit of my alu. It is a 4 bit ALU so ...
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2answers
88 views

Why can a 74HC595 drive 8 LEDs?

I don't understand, I have seen many people use the 74HC595 to drive 5V across 8 5mm green LEDs via 220Ohm resistors at the same time, whereas the datasheet says that the maximum Vcc current is 70mA. ...
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1answer
42 views

NPN or PNP for multiplex seven segment display?

I want to put three multiplexed seven segment displays on a pcb module which then will be connected to another board through a 1x12 Pin header housing an ATMega (so assume in the following that Pin 11 ...
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2answers
63 views

LED radio display - How to control multiple segments at a time?

I have a display from an old radio (I think it was a Watson). Now, there are different wires connected to it: Let's call the first two A and B and one of the others (it seems to be not so important ...
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1answer
65 views

converting an analogue signal to be viewed on a 7 segment display

How do I convert an analogue signal to a digital signal and display it on 7 segment LED's. This must be done without using any programmable micro-controllers. It's for a school project. The analogue ...
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1answer
57 views

Arduino based clock with 4 pieces 4" 7 Segment LED Displays

I was going through multiple tutorials on how to create an Arduino clock with 7 segment displays. I planned to build one and purchased 4 large (4 inches) 7 segment 1 digit displays. The displays run ...
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2answers
71 views

Using 7-Segment Display on pic18f

I want to show a decimal number between 0-99 on 7-segment display by using 2 push buttons. These buttons will be used for incrementing and decrementing the number on display. I'm using pic18f assembly ...
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2answers
47 views

MAX7221 experiencing 40C temperature rise above ambient

Each MAX7221 (2) in my current design is getting very hot. I used the FLIR One to get a general measurement. I observed a 40C rise above ambient. I'm not sure what the root cause is. Perhaps ...
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2answers
55 views

BCD to 7 Segment is producing too little voltage

I am trying to use a BCD to 7 segment decoder to power my 7 segment display. This is the decoder I'm using ...
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3answers
122 views

Increase voltage from 5 to 12V to deactivate a display

I'm developing a timer based on this project: Digital Stop Watch with ATmega8 by Avinash Gupta (I cant put the link, because my reputation is too low) Original schematic: At first, I made the same ...
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4answers
94 views

Can this shift-register circuit be simplified?

I've created a circuit using a shift register to drive a 7-segment display which is all controlled by an Arduino Uno. The circuit appears to work fine, I have a sketch running which simply counts ...
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1answer
62 views

0.56inch 7segment display failure

I am Nikhil from India, working as an embedded programmer. I made half inch 7segment display based digital clock. But after few months few 7segment displays got damaged. I got same complaints in many ...
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1answer
56 views

Using a PAL for a seven segment display

I know next to nothing about PAL. I was wondering how one goes about programming a PAL (an old TIBPAL 16L8-25CN in my case) to drive a seven segment display, sort of like a HEF4511B. Right now I just ...
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2answers
74 views

VHDL: How does one assign custom values to identifiers of an enumerated type?

For a design with seven segment displays, it will be easier in modelsim simulation if one can see the actual display value going into the seven segment display e.g hexadecimal D which is "1000010" in ...
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1answer
70 views

What is the pin to light up colon in Basys 2?

I am trying to make a clock in a Basys2 board but I can't find in documentation the pin to light up the colon of the 7segment display. Where is it?
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1answer
65 views

Comparator and 7 segment display

I am trying to make a 7 segment display that displays the symbol <, > or = depending if a > b or a=b or a < b by using the output of a comparator(7 outputs from the comparator according to the ...
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2answers
47 views

Discrete Logic with Seven Segment Displays Problem

As a small project, I decided to make this circuit from Gadgetronix. However after wiring it, the display is stuck on 20 and when I activate the pushbutton, the 0 (display of IC2) just dims, and when ...
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0answers
77 views

FSM 4x7 segment displays Verilog

I got problem getting around Verilog. I am trying to create a FSM that displays numbers on one of the displays and on the next state to display a string. I did make the string to be displayed ...
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1answer
109 views

How do digital watches use so little power (and how do I do that?) [duplicate]

The title of the question is pretty self-explanatory. I did a quick back-of-the-envelope calculation for my own digital calculator watch (the Casio CA-53W for those who are interested). The battery ...
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2answers
70 views

How would I create this kind of circuit?

I'm just starting out with electronics, this should explain why my "schematic" is so readable. I'll attach it and explain further. I know how to create a simple circuit with the main slide switch and ...
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3answers
186 views

Is the there an intended PCB layout for the MAX7219/MAX7221 I'm missing?

The ordering of the segment pins (14-17, 20-23) on the MAX7219/MAX7221 common-cathode LED display driver is unusual, to say the least: The order of these pins is similar, but not identical, to the ...
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2answers
76 views

How to power a big high voltage 7-segment array with minimum parts, without frying my wimpy power supply?

I am trying to design a clock with a big 8-digit 7-segment display formed by about 250 LEDs, but with a power draw limit of 1A from a 5V USB phone charger. Each stroke is four LEDs in series and ...
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1answer
319 views

hexadecimal seven segment display verilog

I have a 4 bit output number as output. How can it be seen on seven segment display as hexadecimal number? I'm new and mentioning verilog. case example: ...
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1answer
115 views

How to “unground” a low state of a not gate

I have a seven segment display(LTS4680AE) and the anode of each segment keeps getting grounded. So I basically have a 4 bit adder which adds two 4 bit numbers and produces a 4 bit output. This ...
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1answer
43 views

Voltage to segments on 7 segment display?

I am thinking of purchasing an LTS4680 seven segment display for one of my projects.Here is the ...
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3answers
437 views

How to display a double digit decimal value on a seven segment display?

I recently finished a 4 bit adder project and I wanted to "extend" it.Right now,the output is represented by 4 led's(1 for each bit).I want to display the answer as a decimal in a seven segment ...
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3answers
131 views

Designing logic for 7-segment display [closed]

I want to design the logic of a 7-segment display driver. As for the specs, I want it to have 4 inputs coding the binary value of numers 0-9 and 8 outputs for the display. I am not really sure where ...
0
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1answer
77 views

7 segment LED display not working when using common pin as cathode?

I am trying to wire up a 7 segment LED display but when I connect the common pin to ground and the LED pins to V+ the display doesn't work. However when I use the common pin as an anode and connect it ...
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2answers
599 views

4 Digit 7 segment display LED missing one light (on all four digits) [closed]

Hi I ordered online a voltage meter and got this tiny cute little fast refreshing pretty darn precise reliable meter. HOWEVER I am missing on all four digits the left lower vertical light piece. What ...
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1answer
97 views

How can i connect 9 7segments to a 3x4 keypad using only diodes making each 7segment displays only one number? [closed]

I want to make each button in the keypad to display one number using only diodes without using any decoders or ic. thanks in advance
0
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1answer
55 views

How to Separate 7 segment power supply

I'm trying to drive a multiplexing double digit 7 segment (5261AS) using Arduino and two shift registers (74595) I need to separate power supply for the 7 segment to avoid overloading current from the ...
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0answers
30 views

How to control four 10-pin 7 segment display [duplicate]

I'm a student trying to make a device for our research project so I'm quite (if not entirely) new to electronics. I'm planning to make a 4 digit display using four 7seg display using arduino and each ...
0
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1answer
181 views

How to convert BCD to multi-digit 7-segment?

I have a BCD input in the form of 8 wires (eight bit number, up to 511 decimal) and I want to display it on a seven segment display. I have found a product which has 4 1/2 digits and a converter, but ...
0
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1answer
147 views

Problem with 7-segment display: dimly lit when off

I'm driving two large seven-segment displays using two shift registers (74HC595). The displays have a forward voltage of 12V and a max forward current of 20mA. I'm feeding data and 5V of power to the ...
0
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2answers
54 views

Appropriate Brightness for LED Displays

This may be a question strongly depending on application and opinion, but I'll give it a try. I am designing some controls for an industrial application, including cap touch buttons and LED 7-segment ...
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3answers
151 views

Driving 2inch 7segment display using pic microcontroller

I want to drive 2 inch 7segment display(common anode) using pic microcontroller. The forward voltage of segment is around 7v. The emitter of the pnp transistor is connected to the12v power supply. ...
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1answer
110 views

Using a LS248 7-segment driver, but segments are dim. Can't figure out why

I'm building a project where I want to use two double-digit 7-segment-LED displays (green, common cathode). From what I've read, a shift register wouldn't be able to source enough current, so I ...
1
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2answers
562 views

Driving two large 7-segment displays using Arduino and shift registers

I recently started a project in which I want to control two 7-segment LED displays using two shift registers (74HC595) and my Arduino. I thought I had the basic ideas mastered, but I ran into some ...
0
votes
1answer
75 views

7 segment display orientation problem

So i am completely new on this topic. i have a problem which looks something like this. i have a light which is designed with a 7 segment display which gives the reading of various parameters . the ...
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2answers
1k views

Proteus ISIS Fast simulation

I want to display my output on 3 seven segment displays, I am doing that by serially switching them on and off. I have taken some help from here : ...
0
votes
1answer
750 views

7-segment blue LED display at 3.3V

I'm driving a blue 7-segment LED display with a TI CD4026BE on a 3.3V circuit. I cannot find any data sheet for the display part. It has a common cathode pin layout and it's marked FJ5161AB on the ...
0
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4answers
338 views

4 digit 7 segment CC - all digits count the same number

Ultimately I'm looking to build something that's going to count revolutions as part of a guitar pick up winder. I've got a circuit hooked up with 4 x 4026 counters going into a 4 digit 7 segment ...
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1answer
353 views

Design a Decoder using Logic Gates to display letters on a 7-Segment Display

The task I got is to design a similar circuit to a standard BCD to 7-Segment decoder, except only using Logic Gates and to display a eight letter character word, for example: SHELFLES As I have ...
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4answers
2k views

Help on 74LS47 and 7 segment diode

I'm quite new to electronic chips and I'm trying out my first project which is a requirement for school. My problem is that my circuit doesn't light up. here is the image of my project. I need help ...
0
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1answer
249 views

Current sourcing octal buffer/line-driver for 7+1 segment LED multiplexing?

I would like to multiplex 8, 7-segment LED displays with two, 8-bit shift-registers. The required current for one segment is 20mA. I have no desire to overdrive the ...
0
votes
1answer
431 views

What's the difference between a decade counter and a “Divide by 10 counter”(MOD 10 Counter)?

I have a project of creating a digital clock out of multiple 7-segments. In order to display digits 0 to 59 in 2 7-segments which is better and easier to use: cascaded decade counters or a "divide by ...
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2answers
220 views

How do i hook up this 2-digit 7-segment display

I have a 2-digit 7-segment display. I'm not able to determine the common anode pins even after consulting the datasheet. Where are the anode pins?
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1answer
229 views

what is the value of resistor used for 4 digit 7 segment 12 pin display?

refer circuit http://www.instructables.com/id/Arduino-4-digit-7-segment-display/ .Here no any resistor is use is there any need to connect resistor for a b c d e f g .And is there any alternative for ...
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2answers
305 views

multisized 7-segment displays in a circuit

I want to use 1-inch & 2-inch 7-segment display in a digital clock based circuit(six 2-inch display in a row & six 1-inch display in another row). I am using 74hc164(serial in parallel out ...