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

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
54 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 ...
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1answer
41 views

4518 and Arduino

First off, disclaimer; I'm a computer scientist in the progress of my first baby steps in electronics. I'm trying to hookup a 7segment with a 4511, 4518 and an Arduino. The 45-series chips and the ...
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1answer
109 views

CLK net warning for stopwatch code on FPGA nexys2 board?

I'm coding for a stopwatch which displays 10ths of a second on the rightmost two displays and seconds on the left two displays. The synthesis completes properly but after I make the UCF file and try ...
0
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1answer
51 views

What type of display digital watches use? [closed]

I need a "thin" seven segment display to buy. It should be in size of a digital watch. It can be both seven segment display or character display. How should I search? When I seek for 7 segment display ...
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2answers
90 views

How to make a duplex 7 segment display

I have built the circuit below and have been using a 7 segment display which is meant to be designed to work with the circuit. However there is no clear diagrams showing which wire on the display ...
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1answer
72 views

Improving my impulse counter circuit

I just started studying electrical engineering this semester, and I'm currently working on following impulse counter: The circuit is basically a power supply regulated to 5V, a pendulum acting as ...
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4answers
148 views

Shift Register Counter

I am working on a project with my MBED microcontroller and I'm running into some snags, because I'm new to it and getting myself confused with how exactly everything works. I have my MBED hooked up ...
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0answers
74 views

High-voltage seven segment LED display driver problem

I've a circuit similar to THIS project, with a 74LS04 as inverters instead of 74HC54 (tested 74HC04 and CD40106 too) and ULN2003 instead of ULN2803. The circuit seems to work perfectly but when I turn ...
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1answer
52 views

Logic in displaying numbers in 7 segment 4 digit display

what is the logic in displaying desired numbers in 7 segment 4 digit display. Ie, how to know the leg combinations to see the desired number in the display
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118 views

Additional current source for large LED-7-segment-display

I have two sets of LED-7-segs. Each with 4 Digits, all 4 inch tall. One set CC, the other CA. Combined they consume some smooth 1.68A / 1.4A according to the data sheets. That is manifold the ...
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0answers
104 views

Possible to copy a circuit from 1 Logisim .circ file into another Logisim .circ file?

I'm using Logisim to experiment with Electrical Circuit design, and I was wondering if it is possible to copy a circuit created in 1 Logisim .circ file and place it into a different Logisim .circ file ...
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17 views

Fractional Decimal to Base7 Conversion with Radix Points? [duplicate]

I was hoping someone on here could help explain Decimal to Base7 conversions with Radix points. I'm pursuing my Bachelors Degree in Computer Science with 12 courses remaining, currently in a Computer ...
0
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3answers
138 views

Decimal-Binary-Hex-Base7 Conversions with Radix Points?

I was hoping someone on here could help explain number base conversions with Radix points. I'm pursuing my Bachelors Degree in Computer Science with 12 courses remaining, currently in a Computer ...
0
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3answers
266 views

2 Digit 7 Segment Display Driver

I need to display the temperature acquired by my LM35 on a 2 digit 7 segment display. What I have is LTD383-R2 Common Anode Display. Datasheet here. The display has 1 Anode pin + 14 Cathode pins for ...
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4answers
300 views

Rotate a 7-segment display in firmware

I have a board with a 7-segment display controlled by an AVR. I need to rotate the display's characters in the firmware, so that the display is read correctly when physically rotated 180 degrees. ...
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1answer
77 views

Count number of hours elapsed

It's been a long while since I played with circuits, I'd appreciate a sanity check of the following design; I'm trying to count the number of hours since the reset button was last pressed. Ideally ...
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2answers
125 views

Using NPN Darlington to switch on PNP

I'm trying to separately switch on the digits of a 2 digit common anode 7 segment display (specifically the Lumex LDD-E2802RD because it's small and cheap). I think that the easiest way of getting my ...
0
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3answers
460 views

How to make 7-segment display count up ?

I've connect 7447 decoder and 74193 counter as shown in the picture but I have not used 555 timer yet. Is there any way to test the circuit before using 555 ? I've connected the pins (up and down) ...
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1answer
119 views

7 segment count jump from 00 to 05

I'm new at coding and need some answers, I doing some mini project and I got caught in some errors I'm not sure, I'm doing a ''photocopy'' machine and I have to code it in C under the Microchip MPLAB ...
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2answers
1k views

How to connect 7447 decoder to 7-segment display?

I've connected a 7447 decoder to 7-segment display as shown in figure. When I connect an input, the LEDs doesn't form numbers but they light up randomly. I just want to know the right way to ...
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4answers
93 views

Outputting a clock signal from an FPGA

Referring to question here: Click here, I'd like to use the 16 channel LED driver to run my 7-segment displays. I'm using a Spartan 6 LX9 FPGA to implement a 16-bit microprocessor that will take care ...
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1answer
194 views

Driving 7-Segment Displays using a microcontroller

Before I start out, let me just point out that I'm new to hardware design. In fact, this is just hobby for now, but might turn into something later. Because of this, I don't follow any standards per ...
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1answer
169 views

Simple high side driver for multiplexed 7-segment displays?

How can I best drive and switch high side power (for multiplexing) between the 7 displays with as few components as possible, for under $2. I am trying to simplify a design. I have a custom board ...
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2answers
109 views

Shift registers(?) failing after being left on a while

Resolved: SLCLR on SN74HC595 was not tied to VCC, so behavior was inconsistent. I have a custom built board that is running seven 7-segment displays, multiplexed using SPI from an 5v Arduino Pro ...
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406 views

Possible to use 7447 to drive common-cathode 7 segment display?

I know that the 74(LS)47 is designed to drive common-anode displays. However, is it possible to make it drive a common-cathode display? What is the simplest (in terms of components) way of doing this? ...
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2answers
379 views

How to drive a single 7 segment display with I2C?

I am looking for a solution to drive a single 7 segment display with I2C. I found some websites that shows 2 or 4 digits with I2C but I didn't find a solution for driving a single digit. I'm making a ...
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2answers
138 views

Difference between 7446,47 etc

I have looked in the data sheets, as well as the TI article, but I am still unsure of the answer to this question: What is the practical difference between a 7446 ("BCD to 7 segment decoder/driver ...
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1answer
135 views

7 Segment display binary to decimal

I have a few questions about 7-segment LED displays. When we build a circuit using 7 segment (common-anode) and decoder (7447), we also use 4 tactile switches to make combinations. Should I directly ...
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2answers
161 views

7-segment display driver IC [closed]

Which IC can I use to control 7-segment display? I want to make simple projects like a reaction timer but I don't have an Arduino or some other microcontroller available. What ICs can I use instead?
3
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1answer
124 views

How to read SAA1064 7-segment values

I have a central heating system that displays it's info and error codes on 4 7-segment displays. These displays are driven by a SAA1064, like so: This SAA1064 (datasheet here) receives it's ...
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1answer
115 views

Display for outside (sun)

I am currently working on a little project where I would like to have a display which would have to support this format: 00 00:00:00 This would have to be used outside on a motorcycle ...
0
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2answers
174 views

Driving three large 7.5v common anode 7-segment displays with Arduino

I'd like to drive three common anode 7.5v 10ma 7-segment displays using my arduino uno and a few 74HC595N shift registers. The problem is the uno only outputs 5v 40ma on the digital pins. I am ...
2
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2answers
90 views

low power displays

What kind of displays can I use effectively with a coin cell battery (CR2450)? The backlight or the entire display would be on only when necessary. From previous answers I know that a liquid crystal ...
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1answer
139 views

7-segment driving circuit not working as expected

I have designed and built the following 7-segment driving circuit utilising an Arduino Micro in order to try and further understand electronic circuit design: simulate this circuit – ...
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1answer
829 views

Display digits on 7 segment 3 digit LED display with Launchpad

I have a 7 segment led display with 3 digits (BT-M512RD-DR1 ) and Valueline Launchpad MSP-EXP430G2 I connected LED display according to this answer and here is my version of the sketch But I am ...
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128 views

Help with ICs, 2-digit 7-segment displays, 74HC4515

Can someone show me how to connect two DC56-11YWA 2-digit 7-segment LED displays to an Arduino Uno or Mega2560 using two 74HC4515s? Is there another IC that I will need in addition? I want to display ...
3
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2answers
194 views

How to “deserialize” a digital output to 4 digital outputs

I am working on a small test project for my Arduino and as part of it, I want to display a number on a 7-segment LED system. My first setup involved just direct links to the 7-segment display and ...
2
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2answers
201 views

BCD to 7 Segment Decoder Schematic: Need help fitting in page

I am working on the schematic for a BCD to 7 segment decoder right now. I understand the logic, but it is the design of the schematic that I need help with. Here is my schematic so far: As you can ...
2
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2answers
390 views

How to filter out the mains power supply spikes?

I'm purposely dropping AC from its normal levels (230VAC @50Hz) just to analyse the behaviour of a DC motor drive board that I have. When the AC mains voltage falls below 180V, the 7 segment display ...
2
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1answer
623 views

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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2answers
148 views

Reducing power consumption in controlling 40 7-segments [closed]

Following that post here: Designing a large 7-Segment display To give you the basic approach I did that: form the uC to shift register followed by ULN2003, then connected 8 7-segments together Put ...
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3answers
179 views

Seven Segment problems,voltage and current

I want to ask a question about a project I am making, I am using a seven segment. Here is Information about the seven segment: http://www.4project.co.il/documents/doc_188_54.pdf I want to use this ...
2
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2answers
1k views

Weird ULN2003 to 7-segment behaviour in Proteus

I'm trying to drive a 7-segment common anode, in the following connection, however there is no output the comes from the ULN2003 at all, its like when it gets a 0 in the input, it gives a tri state ...
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1answer
285 views

Designing a large 7-Segment display

I'm trying to design a product that have the following features for mass production, and I'm asking from your experience, how to get the lowest price for the components, quality of the chips in terms ...
0
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1answer
181 views

How to connect 3-digit display and suppress leading zeroes?

I searched a little and it told me to use with more than one display, connect (Ripple Blanking Output) from most significant 7447 to the of the next 7447. Which number would be most significant? ...
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2answers
301 views

What seven segment display do I have? [closed]

I'm having a surprisingly hard time figuring out which seven segment display I have on a board I'm looking at. It is common anode, as there is one pin tied directly to Vcc. It's like this, except ...
3
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1answer
263 views

Why is my LCD stop to work correctly when my pump is running? [duplicate]

I have a 8x8x8 lcd/led/button module (tm1638 chip) connected to my Arduino r3. When I attach a pump (GPH350, 1.5A, 12V to the same power supply (12V, 5A) - my display stops working correctly (only ...
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0answers
387 views

MAX7219 interfaced with ATmega128 producing strange results on 7 segment display

I have built a circuit using an ATmega128 interfacing a MAX7219 decoder to control a 7-segment display. I would appreciate if anyone could help me figure out a problem I'm having with my setup. I am ...
2
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3answers
1k views

Cheap 4 digit 7 segment display driver

Can anyone recommend a cheap ( less than $4 ) driver chip capable of driving a 4 digit, 7 segment display with the center colon? I'm very familiar with the likes of the MAX7219 and similar but they ...