Make a scrolling text display with CD4094 shift registers!
ฝัง
- เผยแพร่เมื่อ 29 พ.ค. 2024
- Learn how to use CD4094 shift registers in a fun project! In this scrolling text display we learn how to control many LEDs with a microcontroller and CD4094 shift registers.
This PIC microcontroller project uses CD4094 shift registers to display scrolling texts (up to 6000 characters). This project uses eight digits, but it can be expanded to much larger numbers of digits. Check out the companion article on my website for more details and an up-to-date list of all components: www.friendlywire.com/projects/...
Thanks for tuning in, and let me know in the comments if you have any questions!
Website: www.friendlywire.com
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Timestamps:
00:00 Overview of the scrolling text display
00:51 Introduction
01:04 What you need
01:53 CD4094 shift register explained
03:58 Schematic
05:40 Building the circuit
09:26 Building the enclosure
19:11 Flashing the PIC16F1455 & custom texts
21:10 Outro & first 6000 digits of pi
Great project! Thanks for going into as much detail, really informative.
Thanks so much, I am really glad you liked it! Do you have something else that you want to learn about with microcontrollers? I am always interested in new ideas :)
Fantastic demonstration of how shift registers can ultimately drive dot matrix/UHD panels from only a few CPU signal lines
Glad you find it useful! Stay tuned for my next video where I talk about the TLC5916 driver IC because the CD4094 I use in the above video are too weak to drive larger displays. Should be out in a week or so :)
method #2 and red filter reminds me of vintage gear and pinball machines. A fun project and so well explained!!
Thanks, glad you like it! :) The CD4094 is not an LED driver, so now I always recommend to use the TLC5916 instead (on which I also have a video).
Thank you for explaining CD4094. I had problem with driving led matrix that is using this register.
Glad the video was helpful! :) Let me know if you have any questions, I am happy to help!
Appreciate your hard work
Glad you like it! :)
Good job Dude. very well explanation and very well presentation...
Thank you, glad you like it! :)
I discovered your channel through a post on Reddit, and I must say that I am not disappointed. I am French and my English is not perfect, and yet I absolutely understand all of your explanations. The projects are simple and really, it's nice to see in 2020 projects without arduino but with PICs. Thank you very much for what you are doing, and I sincerely hope to see more content soon. I am obviously subscribed
Thank you so much, I am glad you like it, it means a lot! I have no plans of stopping anytime soon :) Do you have something you are particularly interested in? I am always looking for new ideas!
@@FriendlyWire You're welcome. Well i don't know .... Something with logic gates ?(i have a board for that i can send the schematic to you if you want. just send me a PM on twitter @aigreek) or more CD40xx project (i love these chip ^^)
@@AiGreek2425 Thanks, I like that idea. Most of my planned projects/tutorials focuses on PIC microcontrollers, but good old CMOS circuits are also a lot of fun! I'll get in touch on Twitter :)
Really well done video. Nice project!
Clever idea bending the wires of the display.
Thanks so much! It works well with the CD4094, but if you want to use the 74HC595 register instead it's more difficult that way.
@@FriendlyWire Well I'm all for doing things the easy way - so I guess I'll go with he CD4094 if I try something similar :-)
@@JeremyCook I discovered this by accident, but it does make me wonder whether the CD4094 was designed for this purpose... :)
@@FriendlyWire Ha, as with many excellent discoveries :-)
@@JeremyCook Thanks :)
Another great project. Again, well explained and presented. And a very clever idea using the dollar store wooden pencil box -- somebody's thinking outside the box 😂.
Thanks so much, glad you like it! I was waiting for that comment, in fact, I wanted to make that joke in the video at first :D
@@FriendlyWire LOL. You can always count on me for a pun or two.
@@MindFlareRetro I'll keep that in mind ;-)
aweson video
Saludos,
Thanks so much, I am glad you like it! Let me know if you have any questions :)
Do you think this can be done without a micro-controller? I am trying to do something similar to this, just only using the Tx and Rx wires. I would simulate my own clock using a 555 timer and i would use the start bit, as it exits the shift register to, hopefully, trigger the OE and some how Reset. Does this sound possible to you?
That is an interesting question! If you search for "single wire 74HC595 drive" you can see how you can control that shift register with just one data line :) I am not sure if that works exactly for the CD4094, probably not because the tolerances are different.
Great video and project! Curious does the little microcontroller in the box send the clock and strobe 90 degrees out of phase? Thanks
Hi there, thanks for your kind words! I am not sure if I understand your question, so I will attempt to answer it as best as I can :) When I am sending out the bits for the segments I first set the data pin, then put clock to 1 and then back to 0. After I have done this for all eight bits I pulse strobe to 1 and back to 0. During the time that strobe is active, clock is always kept low. So there is really no overlap between the clock and strobe signals. I hope this helps? Let me know :)
@@FriendlyWire I understand what you are doing!
On my design I will simply invert the clock with a npn inverter so when clock is high, strobe is low, and when clock goes low, it will send a high to the strobe on the relative negative going clock, which is a positive going strobe.
If you look at the data sheet for the 4094 it states it clocks the shift register on the positive going clock, whilst the storage is clocked on the negative going pulse.
p.s. my needs are totally different as in my experiments i have a rough 4 bit shift register set up, with a clock on 2 4013s.
The Data pin is fed from a noisy signal from a Monotribe filter, which in turn its filter cutoff is controlled by the value generated by the 4 bit A/D fed BACK to the filter control (moddded by me).
In a sense it is recursive as the filter opens up on 1111 to A/D whilst on 0000 A/D the fed back cutoff is lower. As the Monotrbe has a 1 bit noise generator upstream from a 12db resonant filter, the actual "quality" of the noise fed to the comparitor that triggers the data is based on what value the A/D generates.
I will prototype this test circuit with a 4094 and see what effects I can generate for music.
Again, I really liked your project! I always watch others videos for ideas for my music applications.
My goodness, I just saw your comment, sorry for the super late response. Thanks for your explanation of the clock logic. I have seen people use a single wire interface to address a 74HC595 shift register, perhaps it is also possible for the CD4094. :)
Let me know if your music project is up and running, I would love to see it.
@@FriendlyWire here's a rough demo of the mark1. th-cam.com/video/J84iEge3GqQ/w-d-xo.html. i am working on a much better mark2 in the fall.
In the video do you use the displays common anode or common cathode?
They are common cathode displays. You can see a more detailed list of all components on friendlywire.com/projects/scrolling-text/#components .
If you want, you can also use common anode displays, but then you have to invert the signal that is sent to the shift registers and turn all 1's to 0's and vice versa :)
Let me know if you have any other questions, and have a great day!
Really happy to see this video but only one question remaining as Which type of shift registered is used??? And if the strobe line are connected in parallel then is it not that all display operates simultaneously on contrary to your first part of explaination that only one display is on at a given time???
Hello Victor, this project uses the CD4094 shift registers. The schematic is at 4:00, and you can also find it in the article here: www.friendlywire.com/projects/scrolling-text/#ch2 . The strobe line updates the CD4094 outputs, yes :) Where did I say that only one display is on at a given time?
@@FriendlyWire really sorry for the mistake sir ,it's not in this video but on the other video were the host tells in the assembly of multiple digit display only one digit display is functional and rest will be off and only due persistence of vision we see all the digits simultaneously.
So kindly explaine on this sir as out of several videos that I had reached only this video give me a clear insight.
@@victormaxwellpeters9771 I am a bit confused :) This video here uses the CD4094 shift registers. In this case, all LEDs are on at the same time. We also call this method "direct drive." The other video you are referring to is probably the MAX7219 tutorial. The MAX7219 is an LED driver that multiplexes 8x8 LEDs. In this drive method only eight LEDs can be on at any given time.
The source of confusion is maybe this: both the CD4094 and the MAX7219 use a serial data interface to receive data. In other words, they both use a clock line, a data line, and a strobe line to receive their "instructions" of what they need to do. The CD4094 is very simple, it just receives eight bits. The MAX7219 is more complicated, because it can receive actual commands that control the 64 LEDs.
Let me know if this helps, or if something is not clear yet :)
@@FriendlyWire Thank you sir for the wonder full video and for having all those patients in the world to provide me with those wonderful insight.
The video link for the source of my question is given below th-cam.com/video/fYAlE1u5rno/w-d-xo.html
Best video
Thank you, Sabir, glad you liked it!
There’s no any different point that have fix digit on that 4094 ic? I want to install this display on motorcycle gear shifting that’s why I want to display fix digit in every time i shifting the gear. There’s no any separate pin which show own digit from 0-6.
Thanks for your interest :) I am not sure if I understand your question, though. You can connect only six CD4094 to the circuit, no problem. All you need to do is change the source code for the PIC16F1455 to display what you want. Let me know if I got it wrong :)
FriendlyWire I mean in your video you’re giving the pulse then it’s changing the number 0-9 but i am asking if I give negative supply in one leg it will show 1 in another leg it will show 2
I am sorry, I still don't know what you mean. What do you mean by negative supply? This circuit only runs on 5V. There is a full article here, maybe it is helpful? www.friendlywire.com/projects/scrolling-text/
FriendlyWire it’s okay will you make a video how to make fuel meter for motorcycles using 7 segment display?
I don't really know anything about motorcycles, so I would say it's probably unlikely. But I am sure that it's possible to use this circuit for what you want it to do! Have a look at the schematic and the other videos here, and that should get you started :)
Hi friend.
First of all, congratulations on your video, it is very interesting, I would like to do the same but with two CD4094 integrateds, since it uses three wires, and I would like to light a row of 16 LEDs independently. I would put a 12F675 and two 4094, if you could send me a code a style of the page in CCS.
The issue is that I of those 16 led's, because I want to turn on the led 3-4-5-7-8 for example and then if I press a button turn on the 1-10-11-14-16, for example.
It is to address an integrated PLL the MC145151-2 and thus change the frequency of a station from RX to TX. , when pressing the button it would be TX and when releasing it, it would go to RX. and so I change the frequency. Awaiting your reply and help, thank you in advance.
Regards.
Hi Xabi, thanks for your question! Not sure if I understand all, but if you only need two states for your 16 outputs then maybe it would be easier to do everything without a microcontroller and just hard-wire it with some switches? :)
I have not used the PIC12F675 in any project so far, but these little chips have all you need to convert this project, including the internal 4MHz oscillator.
Great project,is there any way to replace the microcontroller with an Arduino?
Yes, this basic concept works with any microcontroller. If you want to use Arduino, you can still use most of the information in this video, because it mostly focuses on how the CD4094 shift register works. But you will have to write your own program later on to send out the data, and that may look a bit different.
What software did you use to change the text
Hi, this is all done in MPLAB X IDE. Check out my video here that explains it: th-cam.com/video/e4Q2dYVedPY/w-d-xo.html :)
Bạn có thể làm điều khiển led 7-seg dùng Remote không?
Hey there :-) I am not sure if I understand properly, but this circuit works only without a remote. I think you could probably make it work with a remote, but that is a whole new project. I am planning to talk about infrared sensors soon, so stay tuned! :)
@@FriendlyWire thank you so much!
@@noithugian494 Happy to help, and thank you for your interest! :)
Which simulation software is it??
What part do you mean? :)
The circuit designed
@@ashiq3226 Oh, I see! This is Eagle by the company Autodesk. I use it to draw my schematics with it, but it cannot simulate anything. The animations (= colorful wiggly lines) are all done by hand by me.
Awesome project 👍
you can use esp32 to communicate with display with different values
thank you 🧡
Thank you, I am glad you like it! Yes, you can use any microcontroller you want to send the data. I chose the PIC16F1455 because it is very small and cheap, but still has a DIP package so it fits nicely on a breadboard. :-)
καλησπερα, εισαι ελληνασ? hi yannis are you greek?
Hey there :-) My name sounds like Yannis but it's actually Jens, I am from Germany :)
very good, bye
Thanks so much, have a great day!