Arduino and the 4 digit 7 segment led display

Arduino and the 4 digit 7 segment led display - Anything Arduino Ep 21

День тому

In this arduino tutorial I explain how to work with the 4 digit 7 segment led display, and the difference between the four digit display and the one digit display, and how you can connect four one digit display to work just as the four digit one. I then show how to multiplex the common pins to be able to write different numbers to each digit. To see how the numbers are made watch Anything Arduino Episode 7 where I make the arduino sketch that we use and alter in this video.
Link to Anything Arduino Episode 7, working with the 7 segment LED display:
• Connecting a 7-segment...
All episodes of Anything Arduino: • Rock solid encoders wi...
To download sketch files go to duinos.net:
duinos.net/show/?id=250

КОМЕНТАРІ: 276

@techsguild 8 років тому

Love the video, the explanation was perfect, the speed was perfect, and you're easy to understand. Thank you for taking the time to teach this. Thumbs up!

@nastybuttler7880 6 років тому

Dude, you just saved me probably about an entire day of figuring this out. I'm making a clock with these.

@sprinkdesign7170 8 років тому

Thanks Kristian. I have watched a good few of your tutorials, and find them really helpful. You have a great way about you - your teaching method and personality is so relaxed and positive, it's really a pleasure to learn from you. It's great you are covering just the right topics and difficulty level for people like me, who are just getting past being total novices, but still need to grasp the basics. Keep going!!

7 років тому

Thank you very much for your kind words. It means a lot to me, because this is exactly what I try to accomplish :)

@remotecoderz 5 років тому

Nice work. I was able to get the "dot" to light up and alternate between the digits. You never mentioned using Pin 3, and hooking it up to Arduino pin 13. Gave me something to figure out. Thanks for that. #learningArduinoIsFun

@chernoblyat1901 2 роки тому

Definitely better than most tutorials on UKposts

@guilhermereichardt916 7 років тому

Pretty nice tutorial. I'm trying to make a watch of this display using arduino and this video just gave me a pretty good start on how to work them. Thank you

@amd43gaming55 4 роки тому

Very well explained and simple to understand. This is my first working project with arduino. I am also going to repurpose it into a small digital clock. Thank you for the great tutorial.

@vasantj6514 7 років тому

This was a nice video explaining with pin configuration. Thumbs up !

@leef_me8112 3 роки тому

Very nice tutorial, especially explaining that 12 pins of a 4 digit display are the same as those of 4 individual displays.

@GreenHatPIrate 3 роки тому

"It switches very fast" you answered my question. Well explained thank you

@johnmellor6065 7 років тому

found it extremely helpful in getting started , well explained thanks

@godsonshaiju3670 2 роки тому

Just awesome. The video was so detailed. It was so easy for me to follow along because of how precise the video was. Thank you so much. Very greatly appreciated! P.S. I subbed!

@dirx59 5 років тому

Thanks!!!, you're a great teacher.

@illyakuzmych7813 2 роки тому

Loved the video Kristian! Great help

@ernstpaulswens 6 років тому

Great explanation, thanks!

@AHElectronics 8 років тому

Great job!!!! You made it so easy for me to understand!! Thanks a lot for the video!!!

8 років тому

+AH Electronics Thanks for the kind words. Make sure you see the latest episode (22), for how to connect a four digit led display with only three pins... :)

@guidovlaere 7 років тому

Great tutorial, good to understand and helpful. Thanks very much!

@andrasparanici5491 4 роки тому

Thank you very much! What I needed!

@lordhendrickson8585 4 роки тому

Thanks. I am trying to make a video game device like a nintendo game and watch using arduino. I found this very helpful.

@lainpilledaddy6963 8 років тому

this helped me a lot!! its awesome : )

@fr5893 4 роки тому

Thanks for this!

@TheLionOfAfrica 4 роки тому

Thank you very much, a great explanation. you explain well.

@hasanyuksel5185 4 роки тому

Very nice work. Easy to understand. Thank you

@Dajavoutube 6 років тому

Hello Kristian, Excellent videos, very informative and well presented. Question: I want to run six 4 x digit 7 segment displays (each with a resistor of course). Would I need to connect a separate power source so as not to overload the Arduino? If so what voltage would it need to be please?

@NegosyoManila 2 роки тому

so nice!!! Fully watched!

@simonjcacapit629 4 роки тому

thanks for the video!!!

@omkarkhade4602 3 роки тому

Thank you for this tutorial.

@irminsul2 5 років тому

great vid! . .thanks - but why do you not use resistors before the LED?!

@ronaldobrito1172 8 років тому

Thanks a lot friend, this video is great!

@LUCKY007725 8 років тому

Dear Mr. Kristian, I saw so many videos on Arduino projects of different peoples but you are fabulous because of your presenting style, so easy and very different. I need your favor regarding one of your previous episode-4 (Temperature & Humidity Controller), from this episode i made an egg incubator by adding two more relays and also display (16X2 LCD). it is working very fine but for incubator we need different temp & humidity at different time, for that i need to add some buttons to change them directly without any editing with programming. Please make an episode with connection of episode-4 with addition of buttons & LCD/7-segment LED. I am waiting for your valuable response Thanks in advance

@pickledavis 5 років тому

The code on your site is corrupt but I was able to figure out what is going on based on your training! You do man!

@ilyesouali575 4 роки тому

You'r helpful thanks

@amruthanair9988 4 роки тому

nice tutorial....... respect from INDIA

@adrianxie1298 4 роки тому

Great video, very helpful. :)

@andywylie287 2 роки тому

Thanks for the informative video :)

@moritzwallner 6 років тому

Thank you! :)

@shwetharamesh6701 3 роки тому

So cool!! Thanks a lot!!!

@false79 8 років тому

Thank you for this! Subscribing

@Abdul1774 2 роки тому

Kristian this video helped greatly, although I was wondering if you could assist by using this same code, but adding in a way to display numbers that are entered from the serial monitor?

@acatisfinetoo3018 4 роки тому

How would i go about turning this into a digital clock? Yours is the closest i have come to understanding how to do this.

@trippermostafiz 4 роки тому

Thanks so much sir... Such a nice tutorial... Respect from Bangladesh

4 роки тому

Many thanks for your kind words from Sweden. ;)

@trippermostafiz 4 роки тому

@ Sir, Can I have your email or any other contact(whatsapp or others)?? I need to contact you...

@chef9576 3 роки тому

Do we need to also put capacitors for this display?

@goofranshaikh9689 5 років тому

Sir can u make digital clock based on this I m facing difficulty in displaying hrs and minutes

@ayendelossantos6338 7 років тому

hello ! how would you program a 7 segement 2 digit display??

@ShivamKumar-rp8kr 3 роки тому

Thank you!!! It worked

@puneethkumar703 3 роки тому

Hello Shivam, Good day wokwi.com/arduino/libraries/SevSeg you can play with the Arduino simulation here 😀 You can also tinker with the Arduino code for multiple other interfaces here wokwi.com

@indikaudayasaranga988 3 місяці тому

so good video. learnt someny things

@fanch4727 8 років тому

Merci beaucoup

@getachewalemneh1189 8 років тому

hey can you help me with interfacing 4x4 keypad and 4 digit 7 segment ? on arduino

@dzikr_family-Food.Water.Energy 6 років тому

tx for sharing ..

@patrickesterbrooks 7 років тому

can you build a counter with the MAX7219 chip?

@diasenivy 5 років тому

Hi, im trying to finish my project but im having trouble in my codes. How can i make the zero remain in the 1st tube after looping and so o , until it goes back to the first one and loop again? Thank you

@kaustavsamanta5738 5 років тому

Really thank you

@libertyhillprecisionfirear5947 2 роки тому

How can this unit display constant voltage output? x.xx from the other breadboard. example in Paul McWhorter's episode 9. he uses a multimeter but couldn't you just send the data to the display unit?

@fanazonagaming 2 місяці тому

Thanks man

@aravindkumar-yx9wv 8 років тому

super one bro..

@nihadabbikar5788 3 роки тому

I really liked the way you are making the things simpler but when I have done in the same manner as you showed in the video but it is not getting any output and from where is this 4 in 7 segment getting power as you have not connected any supply to it

@puneethkumar703 3 роки тому

hi Niha The Module doesn't need an external power supply. Each LEDs are driven using Arduino Pins itself. To power on an LED, The Arduino pin connected to the Anode of the LED will be driven high and the Arduino pin connected to the cathode of the display will be driven low. hope you got the idea. Please visit: wokwi.com/arduino/libraries/SevSeg has an online simulation page of Seven segment display

@rosagunto 8 років тому

Hola como puedo poner varios sensores de dht11 uno en cada habitación y sacar los gráficos

@powerwizzardz3372 8 років тому

thank you

@arifibrahim3724 8 років тому

why I am getting this message 'D1' was not declared in this scope. i have done same thing.

@grzegorzdabrowski6204 8 років тому

Hello, Why you don't use resistors between segments and arduino?

@nuvaintereseaza 7 років тому

The resistance of the segment is high enough so the current will be under 0.04A or 40mA, the max the arduino can handle.

7 років тому

Lazyness, because I was more interested in the Arduino coding to get it to work. But you are right, that for a correct design resistors should be used.

@moynagurilocal8888 5 років тому

Sir please create a digital clock code for me....

@SickCookie12 Рік тому

hello! this tutorial really helped me build! Is there a place where this code is posted? I wanna test it out with the clock

Рік тому

I think there is a link in the description?

@thisoldjeepcj5 Рік тому

Good fundamentals.

@homer101sterr 7 років тому

For me, digitalWrite(D1, LOW) turns on the first digit, and pinA through pinF on HIGH turns those segments on while pinG on LOW turns it off. Not sure why mine are opposite.

@AwesomeSmiley87 6 років тому

Me too

@nastybuttler7880 6 років тому

I think there are two different versions of this 12 pin unit. My book was saying that if it is common Anode to do one thing, but if it is common cathode to do another thing. I might be wrong, my book has a lot of errors due to probably being translated from google translate.

6 років тому

As Nasty Butler says, there are two versions, one with Common Anode and one with Common Cathode. The Cheat sheet contains the data for both variants, so if you watch this and its companion videos I think you will figure it out ;)

@user-wd5pr5nu1k 6 років тому

got the same

@principaldogradegreecolleg2861 6 років тому

Same here

@kilomikesierra7840 7 років тому

THX for nice video I had no problem when doing EP7 for 1digit, but I get all reversed output on 4digit I think it's matter of cathode and anode So, should I have to fix all the codes from HIGH to LOW, LOW to HIGH? is there any way to fix it more efficiently?

7 років тому

Well hardware wise it is as simple as moving the common pin from +5v to ground or vice versa. Now if you still get inverted the you need to look at this table from an earlier video: duinos.net/show/?id=197 And use the other codes.

@kilomikesierra7840 7 років тому

Thanks a lot I'll try it :)

@PerryCodes 8 років тому

8:00 ... got a little trippy for a second ;)

@vlhy1 6 років тому

Hello Kristian, how do i turn on the decimal point on the 4 digits 7 Segment Led. I have troubles doing that. Hope to hear from you!

6 років тому

Hi, I believe there is one more pin for that, by connecting the last pin aswell, you will get the decimal point aswell. You have to add it to the code accordingly... Hope it helps! :)

@donaldhenke2750 4 роки тому

CAN YOU HELP? I HAVE A 4 SEGMENT CLOCK MODULE THAT HAS 3O WIRES ON THE BOTTOM AND AM HAVING PROBLEM GETTING PINOUT OFIT.

@hashimiqbal6822 5 років тому

What is the white board for and where do i conect the wires on their. IS their anyway to include a rotary knob to change the digits

5 років тому

I don’t know what you mean with white board? Do you mean the protoboard? Yes you can add a rotary encoder no problem. Just make the numbers advance when you turn the knob. Look at further on in the anything arduino series for how to get a rock solid encoder working.

@cameronmoon4690 4 роки тому

Also works with Atmel 2560 project

@veronicastanley-hooper9861 5 років тому

When I use this tutorial my 'blacked out' segments (set to low) are still somewhat (very slightly) illuminated. Would using a 220 resistor in someway on the pin set up help to make them completely blacked out?

5 років тому

Hmm, could there be a short somewhere? Either that or something might be wrong with the Arduino? Do you have an external power source or do you use the power from the arduino?

@veronicastanley-hooper9861 5 років тому

Kristian Blåsol -Thank you. I am using your tutorial for my class afterall. I rewired everything and when complete with code the project worked! Thank you so much!

@somegremlin1596 2 роки тому

Don't you need resistors too?

@SANJAYGIRI 5 років тому

bro you teached me exactly what i am searching . thanks a lot bro . love from INDIA🇮🇳🇮🇳

@DirtyKnees 7 років тому

you are a Godsend

7 років тому

Well thank you! *blushing* ;)

@bendecker5508 8 років тому

How would you light up the semi-colon in the middle of the display?

8 років тому

+Ben Decker There is most probably a pin for the dot or colon as well... Although it is another module. You can hook it up and go through all the pins until you find the one that lights up the colon. Then just add another pin to the sketch and set that pin HIGH or LOW to turn it on and off...

@mohdghouse2739 4 роки тому

Please can you make a video how to send text from android app using wifi module with 7 segment display

@waszqba 5 років тому

How can one combat the issue with ghosting? I mean, "1" has the "0"'s afterglow because of the Arduino not switching segments fast enough

5 років тому

Look at this video instead where I use two 595s to control the leds. By latching everything in the 595s I think that ghosting is eliminated. ukposts.info/have/v-deo/knerlnebZHea2Zc.html

@arduinomaquinas Рік тому

Good work friend ❤😉👍👏👏👏👏👏subscribed Brazil

@Nyqn_cat 5 років тому

the website wont let me get/find the sketch

@gentsejdiu3501 7 років тому

I have searched in other youtube videos but only now I figured out how to work with 7 segment display arduino. I have also a problem, I want to work with lcd 16x2 display , I have wired up , but its not showing text , I don't know how to make it work. Do you have any tutorial about 16x2 display too?

7 років тому

Not yet, I have way too many videos that are not done yet, the 16x2 is one of them... Hoping to get there someday.... Hope you find some other video that can explain it to you...

@gentsejdiu3501 7 років тому

can you send me a good link that works to show text to 16x2 because I didn't find any tutorial that works . It just turns on the light but no text..

@KnitterX 6 років тому

So now you have 12 output pins going into the clock? Does it not need to be connected to ground somehow? I mean it works. I just don't quite understand why. It doesn't look like a closed circuit to me. Why does the display not have a ground pin?

6 років тому

Ah, well any of the Digital pins on the Arduino can be either 1 or 0/High or Low/+5v or GND. This opens up for loads of cool tricks. In this circuit there are four "common pins" one for each digit, so when you send voltage to the leds and connect the common pin of a certain digit, that digit lights up and not the others. Because we are "multiplexing" between all the digits, I only set the digital pin low (GND) for that specific digit we are working with. The other three are high (+5V) so they are not lit. Then we do this really really fast and it looks like we have four digits... Hope that messy explanation helped... ;)

@KnitterX 6 років тому

Yes, that helped. I understand it now. Thank you. :)

@taeyeonjjang5120 7 років тому

hey can you give me the list of all the materials you used? thanks

@amanrishav3429 5 років тому

Hey Kristian!!!PLease help me with the code.The code Shows only 0.It does not counts to the next digit.I have used 4 individual 7 segment LED's .And I have Commom Anode Type LED Segment.Please do provide me with the code.Please.

@justken5 3 роки тому

is this the same for common anode or common cathode ?

3 роки тому

It is the inverse for one of them. All high pins should be low and all low pins should be high for same result. :)

@elienghaus573 4 роки тому

When i do the simple sketch in the beginning with just one digit, it stays at zero and does not count does anyone know why this is?

@starfirrxvx6654 8 років тому

there is a 4 segment driver that can convert a a number from the arduino to the 7 seg in exmepl y write 1000 , 1000 will show on the 7 seg ... u have any idea whats that ship name and how it works please??

8 років тому

+starfirr XvX Could it be this one? www.sparkfun.com/products/9622

@starfirrxvx6654 8 років тому

i guess it is ... can u make a rtc clock with 7 seg display?? using decoders ??? it's kinda hard to do it so will you make a video on it?

@teejn7434 4 роки тому

Do you need to use dupont wires or can you the normal wires?

4 роки тому

You can use any wires of course. DuPont wires are just for prototyping and testing.

@tiagoaguiar9534 8 років тому

My display has a colon and 13 pins, is the 13th the one for the colon or is it wired diferently?

8 років тому

+James I cant find a pinout for a 13 pin variant, but yes, one of the pins is probably the colon. You can always find which pins is which by putting voltage over the pins. Once you find the ground pin the rest should be quite straightforward... Use 5v and a resistor in series while probing...

@tiagoaguiar9534 8 років тому

thank you so much for the help man :)

@domenicocaggiano3955 5 років тому

Thx bruh

@Leviathan0707 3 роки тому

i have a question, why don't you connect any current limiting resistor to the display. The arduino IO pin can only provide up to 20mA and i think a single digit take more current than that (given that all seven segment light up). That is just my personal question, love the great content and experiment that you showed to help us, keep it up mate !

3 роки тому

The simple (and bad) answer is that I am lazy... I should have done that, but I was focused on showing the programming and less of good hardware practice. :/ Lesson learned for me too ;)

@Leviathan0707 3 роки тому

@ thanks for the reply, that really clear things up for me. You are amazing ! Still replying to question on a 4 year old video, really appreciate it !

@puneethkumar703 3 роки тому

hi there. you are absolutely right. The resistors will limit the current and must be in place. Also, can you try this link: wokwi.com/arduino/libraries/SevSeg It is an online Arduino simulator link for seven segment display and it is a great addition for the useful tools you have.

@DupczacyBawol 6 років тому

You could just write one additional function like for example: PrintDigits(int value) to print given number on this display and forget rest ;)

6 років тому

True. I havent gotten into explaining functions yet... But thanks for the tip...

@bogu2359 2 роки тому

The one thing is missing to show how to display a variable which was generated as a result of some maths in code.

@earlybyrdy 2 роки тому

i'm new to arduino. why is there no ground pin?

@MrPkmonster 7 років тому

Firstly, it's great tutorial. It's clear about the pins in 7 segment. I am working on a project. I had a similar 4 Digits Led Segment like yours. However, it's a module which uses 2 shift registers 74HC595. So, how should I write the code to make it runs? Thank you

7 років тому

Take a look at episode 22 for how to work with 595 and 7segment LED displays... ukposts.info/have/v-deo/knerlnebZHea2Zc.html

@minefox6071 4 роки тому

No resistors?

@abdelwahedmounni6027 5 років тому

Hello, :( Could you help me please to purchasing an Arduino? yes Because when I am going to select this product I found that there's some Arduinos !!!. Arduino UNO, ARDUINO LEONARDO and Mega. So I want to ask you about a reference of Arduino that you using. Thanks a lot.

5 років тому

Uno is the most common one and works for most projects. Pick one that uses a dip28/dil28 circuit and not and chip. Then you can buy armel atmega328 chips and use one arduino as a programmer for those chips (see some of the early “anything arduino” episode where I show how to do this). Choose the Leonardo to be able to use the arduino as a usb device. For example as a multimedia keyboard(another episode of anything arduino). The mega is only necessary for really large projects where you need a lot of in/outputs. Hope that helps.

@christhompson8866 4 роки тому

Why is it that I have to flip all the high and low around to match what is being shown in tutorial? I have a Elegoo Mega2560 board.

4 роки тому

It has to do with if you have a common anode or common cathode led display...

@supunsaranga8142 6 років тому

can i get the aurdino code please

@ImadMessaoudi 8 років тому

GREAT job, can you help me to connect the 3 digit 7 segment led

@MasterfidgeTT 4 роки тому

probably the same with 3 common pins.

4 роки тому

Exactly! Don’t know why I missed this comment. Thanks for answering! 😊🙏

@MasterfidgeTT 4 роки тому

@ Oh lol im new to this im suprised i got it right

@electronicswithmadhan1052 11 місяців тому

I have tried this code in wokwi online simulator instead of using real hardware, in simulation I can't able to get the all the 4 digits correctly displayed simultaneously, what's the reason, can anyone tell ? Whether we get this only if we tried in hardware?

10 місяців тому

Do you get them to show one after the other? Maybe you are running the simulation in a slow mode?

@Couchman26 7 років тому

Hey great tutorial but I am having an issue with my board, I press upload code and there isn't any error but my board flashes yellow a few times then nothing happens on the led display EDIT: I fixed the problem, but now my display just has a static 9349 on it

@raresfuncenter2817 5 років тому

Hey, i have the same problem. How did you solve it?

@haroonzulfqar6068 Рік тому

i think u have to use resistors when connecting to digital pins otherwise ur led display will be damaged