A numeric display consisting of seven segments
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1answer
49 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 ...
0
votes
1answer
57 views
Alternative for MC14543B
I'm following a tutorial that use a MC14543B chip.
The chip is defined as "Bcd-to-7 Segment Latch/decoder/driver"
Datasheet is here: ...
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0answers
49 views
Seven segment display flickering [closed]
I am using pic 16f72, my problem is i have to read two ADC values and i need to display it in seven segment display. For each ADC value i have three individual segments. For each segment i have given ...
0
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1answer
94 views
Are these LEDs glowing due to leakage current? How to prevent it?
I've been trying to develop this circuit for a multiplexed display with two seven segment digits and five SMD LEDs. For simplicity, I've only shown one digit (LEDS 1 through 7) and two SMD LEDs (8 and ...
3
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4answers
310 views
Displaying a 2-digit integer on two 7-segment display
I'm having trouble displaying a binary number into a display. I'm not sure of how to split a number in binary into its individual numbers.
For example, if I want to display 25, I want to split this ...
2
votes
1answer
155 views
Seven segment display becomes dimmer as more segments are lit
I've got a common cathode, two digit seven segment display (LDD-N512RI-RA) hooked up to the GPIO pins of a microcontroller (Coldfire MCF52233 DEMO). The problem is that the brightness of the display ...
1
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2answers
236 views
How to control a seven-segment display with 4 digits?
I've taken this seven-segment display with 4 digits from a broken micro wave. Any ideas how to find out how it works? Finding an appropriate data sheet would be great.
-4
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1answer
209 views
I'm driving a large 7-segment display using a microcontroller [closed]
I've seen that others are using TPIC6a596, a combo 74HC4511+ULN2003A, and also TLC5916. Just to confuse things more (for me anyways), there are also MAX7219 ICs that seem appropriate (maybe not for ...
1
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2answers
235 views
7 segment LCD works on breadboard, not on stripboard
I am using a 7 segment 3 1/2 digits "raw" LCD (like this one) using 4 CD4543 controllers and a MSP430. I use one of MSP430's pins to create a 30Hz square wave that I feed into CD4543's phase input. ...
2
votes
4answers
342 views
Need a LED Display
PROJECT:
I'm building a Digital Clock controlled by a Arduino micro-controller. I want it to display the hours, minutes and seconds on a LED Digit Display. Therefore, I need to have several digits, ...
0
votes
3answers
177 views
Revolutions (pulse) per minute counter circuit?
Does anyone know how to set up a circuit by using counters, decoders, 7 segment displays and a 555 timer to show the revolutions (pulses) per minute from a photo-transistor?
I'm doing this as part of ...
3
votes
2answers
237 views
Reverse engineering a 12 pin LCD?
I just found a broken "laser projecting alarm clock". I took it apart, and am interested in only the laser projection arm. This consists of a laser diode (although I suspect that this is actually just ...
-1
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1answer
150 views
Does someone make a 7-segment or LCD display in an industrial enclosure that I can drive with RS232 or RS485? [closed]
I'm working on an industrial machine (factory automation) that has a nice PC-based control interface but it needs a secondary display of a couple lines of numbers.
Is there an off-the-shelf product ...
2
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3answers
213 views
Can a laser display numbers like in an LCD 7 segment display [duplicate]
Possible Duplicate:
Is there a way to convert a 7 segment display to be displayed by a laser beam?
Before you read this, please note that I am a only a child with a growing interest in ...
1
vote
2answers
398 views
solution for driving multiple 7 segment LED display from 3 volt µC
So I am looking to drive 6 digits worth of 7 segment LED digit display...
I want to use a 3v PIC, the interface IC's that I am finding (ICM7218AIPI+ for instance) list voltages like 2-6V, but upon ...
0
votes
3answers
218 views
How to control the brightness of this 7 segment LED display?
This is how I tried to connect a BT-M512RD-DR1 LED panel, but it doesn't really work. This is the datasheet. Basically I have just used 2 wires of the 10 k\$\Omega\$ potentiometer. There is no ...
3
votes
1answer
456 views
Driving 3 digit seven segment using Arduino Uno R3 and a Demux
I have to light up 3 digit 7 segment displays using Arduino Uno R3. I have got myself 3 BCD-to-7 segment display decoders. I figured I need a 4-to-16 Decoder, so I bought one and it turned out that it ...
2
votes
3answers
390 views
How to connect multidigit 7seg common anode/cathode display to cascading shift register?
How can I connect this type of 7 segment display to cascading register like 74HC595? I know I can use 7219, but at the moment I have those cheap registers and would like to see if it's possible.
Not ...
3
votes
3answers
170 views
Why can't resistors be used to connect cathode pins to GND instead of segment pins to VDD with a 7-segment display?
When using a common cathode 7-segment display, is there a reason that two resistors can't be used to connect the two cathode pins to GND instead of using seven resistors to connect the seven anode ...
4
votes
2answers
567 views
7-segment LED display with multiple digits
I was looking at the datasheet for the LTC-4627JR, and it looks like each digit shares a common anode, and each segment shares a common cathode.
My question is given this configuration, I don't ...
2
votes
1answer
106 views
Strange Results With a 3x7 Segment LEDs
I'm trying to get a CPS03631BR 3 digit 7 segments LEDs to work. I've wired it to my Arduino UNO like this:
And I'm using this code, which should light all the LEDs digit-by-digit, then light ...
2
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1answer
146 views
How to drive this 7 segment led?
Is there a single IC solution which will act as serial parallel driver for this 7 segment led
5
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1answer
408 views
LCD modules with I2C or SPI interface
I would like to add an LCD to my current design (a project that is to be produced in low volume, around 50 to 100 units).
A small display size (around 8 or 16 characters) should be plenty since it is ...
2
votes
1answer
172 views
DIY LED panels with even illumination?
This is an electro-optical question.
I'd like to make my own large 7-segment-type displays using discrete LED devices.
What's a method to get an clean, even illumination of the segment from the ...
1
vote
1answer
630 views
How to connect this 7 segment LED display to Arduino?
I have the following LED display, which I want to hook up to Arduino UNO.
According to datasheet, there is clock pin. Do I have to build external clock source for it or I can feed it from Arduino?
...
1
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1answer
98 views
Can a CD4056BP drive an LED display
I bought some 7-segment LED displays along with some BCD-7 segment decoders. The clerk said he didn't have the exact part I asked for and instead gave me a Texas Instruments CD4056BP. He said it was ...
2
votes
4answers
2k views
Logic gate counter on 7 segment display
Using logic gates with general purpose transistors, I want to display numbers on a 7-segment display depending on the 2 pushbutton input. If both buttons are not pressed, I want it to say 0. If 1 is ...
1
vote
1answer
225 views
7 segment display flickering when using switching power supply
I have two 4 digit seven segment displays that work perfectly fine when I use the LM7805 however, when I use the switching power supply, some segments sometimes flicker on their own.
Can anyone please ...
1
vote
4answers
672 views
How do I exchange LCD display with 7-segment LED's?
I have bought a cheap radio controlled clock, and I want to make a hack that replaces the existing LCD display with 7-segment LED's.
With my voltmeter in AC mode, I can measure voltages(with respect ...
1
vote
2answers
158 views
Do I need to solder on my DE2 board to replace a broken segment?
I've already posted a question here about this when I realized that all things were not right with my Altera DE2 board:
Is this display broken or is it a bug?
After verifying that the segment indeed ...
1
vote
1answer
444 views
Multiple 4-Digit 7 Segment Displays with Arduino
I have 3, 4-Digit 7-Segment Displays from Adafruit, and the included docs/ libraries say I should connect the display to pins A4 & A5. However, I have three of the displays, so I am looking for a ...
5
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2answers
701 views
Multiplexing 2 digit 7Segment with one Bit
I want to control a 2 digit 7-segment LED with a MSP430 micro controller. The display has 8 input pins per digit (8th pin is the dot, which I do not need) and two ground pins (common cathode). The ...
2
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2answers
1k views
Driving a large 7 segment display using a micro-controller
I need to drive a large seven segment display (segment length is a about 2 inches) using a micro-controller (PIC 16F877). I've driven normal seven segments directly from PICs without issues, but I ...
5
votes
1answer
244 views
Multiplexed Display
Need to develop a user display for a home appliance with:
Two digit temperature display (Seven Segment).
Four LEDs for 'Power ON' and three 'Modes of Operation' of the appliance.
I came across a ...
4
votes
3answers
2k views
4026 + 7-segment display: do I need transistors?
I'm a beginner and, as an exercise, I'm building a digital clock using without a microcontroller. The main IC that I'm using is a 4026, which counts and converts do 7-segment led format.
The leds in ...
2
votes
5answers
914 views
Why is there a delay in a common anode 7-segment display?
I have a common anode 4-digit 7-segment display. I have each segment cathode connected to a 330-ohm resistor, and the resistor is connected to a shift register. Each segment cathode is connected to ...
2
votes
1answer
357 views
Inexpensive Frequency Counter and Display for clock generator
I have the desire to add a frequency display for a clock generator. Certainly not necessary, I can use my DNN, but it would be nice, I found a veritable plug & play frequency counter and LDC ...
3
votes
1answer
2k views
Using 4 digit 7 segment LED
I have a 7 segment display that has 4 digits. What will I need to make use of this? Can a single microcontroller handle the operation? I mean PIC16F690...I saw also a MAXIM chip that drives these kind ...
2
votes
1answer
160 views
Need details on 35-year old Unisonic VFD (from a calculator)
I have a very old Vacuum Fluorescent Display that I took out of a Unisonic Calculator, that I'd like to resurrect in a clock.
It's a cylindrical glass tube, about 4 inches long and 1/2 inch wide - ...
2
votes
2answers
530 views
Can't figure out this seven segment display
I recently bought four of these seven segment displays: http://www.electrokit.com/en/leddisplay-7segment-58mm-red-green-ca.49450
I'm having no luck however to make it to work, and since there is no ...
4
votes
3answers
2k views
Improving brightness of multiplexed 7-segment led display
I have a two digit 7-segment LED display which is driven multiplexed by a microcontroller. PORTA is for the anodes. In my code I shift a 1 through ...
18
votes
4answers
1k views
Why do 7 segment LCD displays break apart when I brush my teeth?
This question might sound silly, but it is very serious (although geeky, I must admit).
When I use my electric toothbrush in front of my alarm clock (one of those with a big red LED display), the ...
3
votes
5answers
3k views
How to power 24 7-segment displays with Arduino?
I'm working on an Arduino project where I need to power 24 7-segment displays (model Kingbright SC56-11YWA).
I decided to control them using 8 bit shift registers (model 74LS164N). This is ...
2
votes
1answer
327 views
LED Driver IC STLED316S
I am struggling with reading the datasheet for the STLED316S 7-segment/Discrete LED driver IC.
I'm writing code for an STM32 chip, but also using Arduinos as well. I'm having no problems writing the ...
1
vote
1answer
992 views
Arduino + Max7221 + Common anode 4-digit 7-seg LED array?
I'm trying to hookup a common anode 4-digit 7-segment LED array to my Arduino via a Max7221 IC.
Here's a hard-to-see (sorry!) pinout for my LED array (my LED array is the bottom common anode one, ...
-1
votes
2answers
243 views
Displaying numbers on 7segment with switches [closed]
I need to do this:
I have 8 switches in a row. Switches are named 1-8 from the right side.
When I turn this on, on 7-segment display should be number 3 - Then user has to press switch number 3. When ...
0
votes
1answer
285 views
Multiplexing segment LCD
I have a segment LCDs of 29 segment and a single BP.
I can display the digits as i wish with a 40 Pin PIC microcontroller.
But now my problem is to multiplex two LCDs of above type, so that i need ...
0
votes
3answers
701 views
Binary to BCD converison
I have an 8-bit number that the values ranges from 0 to 99. I need to convert that to a proper 8-bit BCD representation of the number using digital circuits.
In case you need to know, the original ...
1
vote
1answer
788 views
Creating a one-digit scoreboard using logic circuits
I'm creating a one-digit scoreboard on a breadboard. Naturally, I have a BCD to 7-segment decoder and a 7-segment display. But I don't know how to automatically increment the display. (It's for a ...
0
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2answers
353 views
Linking two 4511's to drive two independent seven digits displays
I kind of remember to had linked two seven digits displays. using a single 7 bits output with two 4511's linked together, but can't find nothing about that in Internet.
The only way I had found is ...
