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.
0
votes
3answers
92 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 ...
1
vote
3answers
79 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
votes
2answers
86 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 ...
1
vote
1answer
181 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
votes
1answer
39 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?
...
-1
votes
2answers
79 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
votes
1answer
243 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 ...
1
vote
0answers
82 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
votes
3answers
263 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 ...
5
votes
1answer
55 views
7-Segment Decoder outputs/LED display
What would be the difference in using a 7-segment decoder with active-high outputs vs active-low outputs, to driver an LED display?
-5
votes
1answer
97 views
How to change colour of a 7-segment display using the Arduino [closed]
Is it possible to change colour of a 7-segment display using an Arduino Uno?
1
vote
0answers
92 views
Counters VHDL multiplexer 7 segment
I am new to vhdl and my code may seem stupid but i am still struggling i am trying to make a bcd counter using spartan 3 kit i have a problem multiplexing the 7 segment and i know i should use ...
3
votes
2answers
98 views
Shift Registers Controlling Seven-Segment Display without a Latch?
I'm restoring a Model H Skee-Ball machine, and these old models have a bunch of hardcoded settings and unreliable switch detection, so I want to replace the main control circuitry with something ...
0
votes
2answers
80 views
How to cycle through bits of information for a hex display?
I am doing some work with a Hex Seven Segment Digital Display with a built in decoder that takes in 4 bits of information. Controlling it I have 4 cascading T-FlipFlops whose outputs are inverted so I ...
1
vote
1answer
645 views
Control 4 digit 7-segment (2 digits number each) using Verilog
How to program using verilog, where i want to control 4 digit 7-segment display, that will show 2 digits number for first and second 7-segment display, and the others with 2 digits number too. I know ...
8
votes
3answers
276 views
Low power, seven segment display
I want to display a 4 digit number on a small device that fits in a hand.
I have a CR2032 3V battery at around 230mA, my microprocessor is a 8051 (in a BLE112) usually uses about 0.9µA and I want the ...
2
votes
1answer
182 views
How to use Darlington arrays to source current in a 7-segment display driver
I'm building a driver for a large common-cathode 7-segment display using a shift register and BJT transistors (more details in this question).
I wanted to make it more compact by replacing the ...
1
vote
2answers
999 views
How to drive a 12V common cathode 7-segment display with 5V signals and BJT transistors?
I'm having trouble designing a driver for a large (5") 12V common cathode 7 segments display using a 74HC595 shift register and BJT transistors. Below are the schematics for the component (display) I ...
3
votes
2answers
344 views
Driving 7 segment displays through Raspberry Pi's GPIO
So I was thinking of wiring up four 7-Segment displays through the Raspberry PI.
I'd do that by multiplexing each of them, and came across this:
...
1
vote
3answers
379 views
Driving 12 Seven Segment Displays from an Arduino
I will be using the 14 input/output Arduino. My goal is to create a plane radio console for use with a flight simulator. I am very competent at writing code, but have little knowledge of electrical ...
0
votes
0answers
257 views
How to drive seven-segment LCD with CD4055 IC
I have a problem using DE-112 seven-segment (two digits) liquid crystal display with CD4055BE IC. As far as I know, LCD should be provided purely AC current, or it will be damaged with time.
I have ...
-4
votes
1answer
122 views
7 Segment display Stuck on number 0 [closed]
I'm new to circuits and am trying to make a 7 segment display decoder with a 4511. My display is stuck on zero, nothing happens when I press any of the switches, what could be wrong? Here is a photo:
...
-4
votes
3answers
188 views
Solderless Board IC decoder 4511
I'm new to circuits, I tried following this link http://www.electronics-tutorials.ws/combination/comb_6.html to create a 7 segment decoder. I have set up everything on a solderless board, but I have ...
0
votes
1answer
183 views
i2c + 7 segement serial display + ATtiny85
I have a project that requires a 7 segment display and I was trying to get away with using the smallest micro controller possible.
Does anyone see any problems with connecting an ATtiny85 to a 7 ...
1
vote
1answer
71 views
MM5452 with 4 digit parallel 7-segment LCD display
I have a question regarding the backplane connection for the MM5452. From this data sheet:
MM5452/MM5453 Liquid Crystal Display Drivers
It says that the backplane pins on the MM5452 connects to a ...
1
vote
3answers
167 views
Cannot find GND on 7 Segment Display Datasheet
I'm trying to use a 7 Segment Knightbright LED Display, however, after careful study of the datasheet, I'm unable to find what I believe should be the GND pin to power a segment!
...
-1
votes
1answer
175 views
Multiple 7-segment displays connected to P1 of AT89C51
I want to connect three 7-segment displays on port-1 of AT89C51. The display unit has to show some number count. My question is:
What should be the refresh interval for TDM signals on this port so ...
0
votes
0answers
204 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 ...
4
votes
1answer
242 views
7-segment output: 4-6V, LCD input: 3-5V. How to convert?
Problem:
I am thinking of using a chip that gives out 4-6V on 7-segment output
pins but the LCD only wants 3-5V input, so I need to convert somehow.
The display is a TN type, drawing virtually no ...
3
votes
4answers
358 views
Using a 7 segment display to show numbers 1, 2, 3 and 4 with four inputs
I have in my car 4 LEDs which illuminate in the instrument cluster depending on the gear the vehicle is in. This is a factory standard setup which I have already run feeds from ready for the next ...
2
votes
1answer
204 views
How do I control a seven segment display with a shift register and an Arduino?
I recently purchased 4 seven segment displays from sure electronics. They came with their own shift register board which combines the 74HC595 IC with the ULN2003. I want to be able to tie into this ...
2
votes
0answers
286 views
Alarm Clock 7 Segment LED display
I recently got an alarm clock from goodwill and took it apart and am probably going to use the display for some tests. Here is a picture of the front of the display:
The text on the left is ...
1
vote
1answer
414 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
2answers
229 views
Multiplex two I2C ICs into four 7 Segment displays
I currently have two PCF8574AN I2C 8-bit IO expander ICs. Is there a way I could have two seven segments be driven off one IC (So i could run four seven segments displays off the two ICs that I have). ...
0
votes
1answer
183 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: ...
1
vote
1answer
487 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
votes
4answers
3k 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 ...
3
votes
1answer
233 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
vote
2answers
472 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.
-5
votes
1answer
291 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
vote
2answers
317 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
713 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
271 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 ...
4
votes
2answers
571 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 ...
2
votes
3answers
322 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
857 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
312 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
699 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
1k 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
391 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 ...
