Tutorial: Data Transmission using light | Li-Fi

[@ashhkz2203]

Probably one of the greatest and simplest videos i have seen on serial communication over light fidelity... Loved ot

[@snehithkumar8148]

DID IT WORK FOR U?

[@SwapneshKoli]

Same question it didn’t work for me may I should try it again

[@shan_singh]

That was a really great explanation and thanks for providing code much appreciated

[@electronicsandprogramming9794]

Thanks for your comment. It is always nice to have your work appreciated. :)

[@thejasembeddedsolutions]

this a gd tutorial for one who start with lifi technology .

[@literpaper]

its a very clear tutorial, thanks.

[@Drfau1710]

Wonderful explanation.

[@GlobalStreams]

I have modified this project to send image using the same circuit and uses a modified version of arduino program used in this video. However the problem is that it takes a lot of time to transfer the image data. i have reduced the period to 2 and it is receiving data correctly but it is still very slow is there any way to reduce the delay in processing the bytes

[@manishsonawane1828]

Hi! Thanks for this video! I want to follow this and complete my project on LiFi Technology for my course in Masters degree. I really need your help. I just have a few queries. 1. How is the Potentiometer connected here? Can you please tell me which pins go where and to what they are connected? 2. Can I use Lazer-Photo Transistor instead of LED-LDR? 3. How can I connect the Arduino to the laptop and upload the code? Would I be able to find any other video for that? 4. Is it possible to use pair of LED-LDRs to make simultaneous communication between two laptops instead of one-way communication? Please suggest. I have a subject 'Transmission technology' in my course and I have selected this topic LiFi. Please help brother! We can connect via email/WhatsApp or any other platform. Thank you very much in advance!

[@crazyman176]

number 4, yes it is possible, we created multiple versions based on this exact project. We created a custom protocol to send and receive files simulatonalsly. But we ended finally with using UART. You can use SPI as well. check OPENVLC.org for beagleboard, or nerdcorner for raspberry pi. You can use the arduonis as a modem, basically sending the data it receives and send to a laptop via UART.

[@lucaliberato8191]

Sei un drago kitemmuort!

[@Jaya.M78]

Hi sir....great project! Just wanted to ask you....is this related to Signal Processing?

[@electronicsandprogramming9794]

Hello Ashwin. I wouldn't say so.

[@osmanefe8130]

Working good. Thank you bro.

[@johnhu9137]

good job. if i want to transmit 720p video , any solution recommend?

[@025_h_mohitkumardora5]

sir can make this with only one Arduino instead of two?

[@electronicsandprogramming9794]

Hello, unfortunately no.

[@025_h_mohitkumardora5]

@@electronicsandprogramming9794 ok 😅

[@mominator_]

Bro do you have a tutorial to see how things are connected together on the Breadboard?

[@salimirangi2000]

Very nice job. Can you please attach a more clear photo of how everything is wired?

[@FahadAndFarrukh]

Hello Salim, A schematic is provided in this link. github.com/SaadOjo/DIY_Li-Fi A0, A1 and A2 represent the analog pins of the arduino while D3 is the digital pin. Please let me know if you have any other questions.

[@nandinikumari9456]

I tried this project and it worked. Thank you for this video sir . But i am not able to make code for transmitting sensors data through LED. Could you please help?

[@ghadahh9616]

hello, can i ask you how did you connect the Potentiometer please ? cuz in the schematic it is not so clear unfortunately

[@vinolicam4140]

great job! thank you for the explanation!

[@electronicsandprogramming9794]

Glad you enjoyed it!

[@thomaswang3281]

great project

[@ebraheem5585]

What is the photodiode you used to detect the visible light .. Idk if i will get an answer its been 3 years

[@EEffectStudio]

Hello, I would like to ask, the press button which is connective between A0 of arduino receiver and ground why we need it?

[@daCount0]

Interesting project - btw the sound of your keyboard is a littel too loud

[@ankitaraychowdhury4630]

I am trying to implement this project.. but at the receiver side nothing is coming. can you suggest anything to fix the problem??

[@KartikMore-bj3pd]

Hello sir I have one doubt about the transmitter side what value of resistor you have used it seems small I mean smaller than 220ohm so please help me with this. Thank you

[@adarshaadhi9455]

i have 5 sensor values, and i converted thoese to strings and it is recived properly. but i cannot able to retrive it

[@mofeezurrahman9397]

Getting some random characters as output. But they are repeating as the original text should have. How to solve this issue?

[@ajayreddy6845]

Instead of getting the transmitted data on serial monitor ,how to get it on a LCD display

[@J4Jevins]

Instead of Serial.print(buff); Use LCD print..

[@israelflorescovarrubias145]

great explanation but it don't works for me, i have problems con the reciever could helpme please?

[@ريحانهجليلكريم-ص6م]

hi I Have same project I use laser in tx and laser receiver, I tried your code but its don't work, also tried and put laser receiver in digital pin without threshold value also don't work, Can you help me, please

[@fortheloveoftajweed7013]

I have been trying to replicate it for server also days now Everything seems fine but I’m stuck at my receiver LED not Turing on Can you help me figure how I could do it

[@rainakn8300]

Hello, According to the code the data is transmitted serially ryt? So while receiving without knowing the start bit and stop bit won't that be difficult during reception?

[@rainakn8300]

Can you help with the code if we have to convert this data that is received to voice?

[@prabhudevbetsurmath7270]

I am not understanding which wire went were on the breadboard can you provide a slow video of connection or a proper image of connections.

[@lilyfeng9891]

Hi so my transmitter (led light) and receiver can only receive the right message when I hold them in a certain angle, and I tried many different led lights and still can't solve the problem. BTW my led lights cannot provide visible lights under the code, is that the problem?

[@electronicsandprogramming9794]

Hello, so it must be related to the threshold issue or perhaps your LDR is too slow. The first thing that you can do is to check that the first part of the code where we only test is if the led turns on when you press the button. If that part works well it means that your threshold is setup correctly, otherwise you should adjust the potentiometer until this part works well. If this is working correctly you can change the speed of transmission which you need to do for both the transmitter and the receivers, you need to change the TIME_PERIOD definition in both codes but make sure that you change them such that both have the same value. Increase the time period to make the transmission slower.

[@lilyfeng9891]

@@electronicsandprogramming9794 Thank You! So I did check the first part and adjusted the potentiometer, and now it lights up when the transmitter is transmitting the signal. However, the serial monitor still outputs rubbish letters unless there is some sort of pressure on both the led light and LDR in order for the correct message to show. I tried to changed the time period but the same problem happened. I check the frequency of the led light in the LDR light, it blinks at the same rate with/without pressure. Please help me out. Thank you so much

[@lilyfeng9891]

@@electronicsandprogramming9794 Nevermind! I found the problem from one of the comments, it is the number of the threshold. My can only receiver letter at a minimum of 350.

[@zekernz1019]

hey can u help me build this?@@lilyfeng9891

[@chevurusrivarshini6276]

@@lilyfeng9891 hi, i am facing the same problem can you please help me

[@rushabhbannore808]

Hi bro can we use two pc for it Please reply its urgent for me

[@marwanyounes6015]

Professor I have connected the wires like you did in the video but something is wrong and I have noticed that when you were trying the circuit the wires in the transmitter wasnt like shown in the circuit, they were connected to A4 and A1 , so I am lost at which pins should I connect to the receiver

[@electronicsandprogramming9794]

Hello Marwan, If you look at the top of the code you will see that the pin mappings are written. Please try to follow them. Also note that there are two folders the ones with '_code' suffix are older so please use the other ones.

[@salatonsimel9064]

@electronicsandprogramming does the button have any use on the new updated code?

[@electronicsandprogramming9794]

Hello Salaton, The button is only used for testing purposes.

[@alijaafar12]

you don't clear the diagram right please could you explain how the wire is connected from wich bin goes to wich bin please I want to make this project

[@TejasL-v8m]

How did u set the threshold?

[@darshanravikumar5300]

Is there any restriction to the color of the LED?

[@electronicsandprogramming9794]

No as long as your receiver is sensitive to those wavelength of the led you choose.

[@Sneha-tp4gy]

Hello sir, our Arduino receiver is not receiving the data from transmitter... Sir what are the three connections on potentiometer It is not clear in the video

[@ALAAHUSSEIN-h2i]

❤

[@marwanyounes6015]

Professor, is there is anything connected to the +ve of the board apart from the 5v from the Arduino , I cant see it properly in the video

[@electronicsandprogramming9794]

Hello Marwan, One side of the Potentiometer is connected to +ve. Voltage.

[@vishnudeepak4826]

Hello sir; I want to implement this project in software like Proteus. Can u help me in that.

[@cemaldinc6008]

hello can ı use the arduino uno r3 for both side. This project is about my graduation project thank u for answer.

[@electronicsandprogramming9794]

Yes Jamal, You can use uno on both sides.

[@cemaldinc6008]

u used arduıno nano can ı used arduıno uno for both sıde

[@electronicsandprogramming9794]

@@cemaldinc6008 yes

[@cemaldinc6008]

@@electronicsandprogramming9794 thank u so much one more and last question i implement the github.com/SaadOjo/DIY_Li-Fi/blob/master/image_2020-10-07_152426.png this photo because the circuit you build is looks little complex. Still the circuit scheme is working isnt it? if it is working i will pray for u Long days :D

[@FlirtyWithPencils]

What is the highest speed we can attain through this? And how can I transfer data from my embedded to laptop-based software in fastest way?

[@electronicsandprogramming9794]

Hello Indrajeet. Well this setup is not really optimized for speed. First you would want to use a phototransistor instead of the LDR as it is much faster, secondly instead of bit-banging just use the hardware uart it would be orders of magnitude faster that way. I hope this answers your question.

[@snehithkumar8148]

by the way at last where have you given input text?

[@mofeezurrahman9397]

Hi Did it work for you ?

[@XxGamesTreeXx]

Hello in the tx side of serial monitor i do not see any text.Only blank page and my text does not trasnmitting.Do you know what is the problem is ?

[@electronicsandprogramming9794]

Hello. The transmitter does not have any serial output. It is expected to be like this. The reason it might not be transmitting is perhaps the thresholds are set differently. Each transmitter receiver pair must be tuned properly.

[@daliausama9148]

May you please wirte up the components used in details?

[@aligeologist3944]

Hello..Dear sir .. the heart rate sensor and the temperature sensor were connected, and then the TX library was combined together and currently I am having a problem with the RX. Can you help me solve the problem? Thank you

[@electronicsandprogramming9794]

Hello Ali, were you able to get the test code working as shown in the video? By the way I would like to remind you that this project is purely educational and not actually an efficient way to transfer data as it uses bit-banging (en.wikipedia.org/wiki/Bit_banging) if you need this for a real project you are better of using UART of the Arduino and just substitute led/phototransistors instead of using wires.

[@aligeologist3944]

@@electronicsandprogramming9794 Thank you very much, dear sir .. Where can I find the appropriate code for this operation to transfer data by led?

[@electronicsandprogramming9794]

@@aligeologist3944 The code is in the description. I am also pasting it here. github.com/SaadOjo/DIY_Li-Fi

[@abdullahhasanali1424]

the serial monter dose not show any thing why ?pleas tell me solving

[@electronicsandprogramming9794]

Were you able to get the circuit setup correctly and work as in 8:26?

[@abdullahhasanali1424]

@@electronicsandprogramming9794 the circuit is correct but doesnt show any thing .there is no any proplem in joint there are proplem but Idont know it .if you have suggestion please tell me

[@beyzacagl7466]

Hello, I want to do this project. But is it possible to do the same project with infrared led and infrared receiver?

[@electronicsandprogramming9794]

Yeah why not. You won't we able to see the light turn on though so it might make debugging a bit difficult. Btw are you from Turkey? Your name sounds Turkish.

[@beyzacagl7466]

@@electronicsandprogramming9794 Yes, I'm From Turkey. Thanks for your reply. I'm doing my engineering project. These have to be infrared receivers and transmitters. So there will be changes to the arduino code, won't there?

[@electronicsandprogramming9794]

@@beyzacagl7466 I also graduated from here, from ODTU :) Yes you are right there is no need to change the code. So you are doing your bitirme project. We also had to use some infrared sensors in our project (kzbin.info/www/bejne/aIbQkJKdecmrbrM) and I can give you a tip. You can use the camera of your mobile to see if the led works, it can sense IR wavelength.

[@beyzacagl7466]

​@@electronicsandprogramming9794 I also study in Ankara. Thank you for your help. I'm trying to develop a prototype for Li-Fi technology. This is the beginning . If I have questions, Can I ask if it's okay with you?

[@electronicsandprogramming9794]

@@beyzacagl7466 Sure, you can ask. I am a little busy nowadays but I will try to reply to you if I have time. Good luck with your project.

[@ruairimc2177]

Hi, I followed the tutorial ( I just didn't use a potentiometer) and although some text comes through the string that I am trying to send does not. I have altered the period time and the threshold but it still does not output the message clearly, any help would be greatly appreciated. Btw I'm using a 10K resistor for the LDR and a 470 for the LED. Also if I was to use a phototransistor instead of an LDR what code would I change?

[@electronicsandprogramming9794]

Hello, Can you do the first part and make sure that the led turns on when you press the button. Maybe the setup is such that the led is inverted.

[@ruairimc2177]

@@electronicsandprogramming9794 Yeah, I have completed the first part and successfully got the LED attached to the receiver to turn on when the transmitter LED is on. I found that the LDR works at a THRESHOLD value of 900. Maybe this indicates that the LDR is not good enough and thus I have a phototransistor that I can use. However, if I try to send the string "Hello" only the He will transmit and the rest is just rubbish letters.

[@xaej1he144]

Is this working ?

[@zekernz1019]

did it work for u?@@xaej1he144

[@abdullahhasanali1424]

I used LDR 4mm it is permissible or not

[@electronicsandprogramming9794]

Yes, it should work fine.

[@abdullahhasanali1424]

@@electronicsandprogramming9794 please can send me dirgram of circuit in tellegram Eino98

[@lilyfeng9891]

hi instead of letting the words show on the computer, do you think I can change the code to let it display on lcd?

[@FahadAndFarrukh]

Yes, it should be quite easy.

[@lilyfeng9891]

@@FahadAndFarrukh okayyy thank you! Another question, so I do not have a long breadboard with me, can this project work with two half breadboard? one for the transmitter and one for the receiver?

[@FahadAndFarrukh]

@@lilyfeng9891 Yes for sure. You can even have isolated power supplies. It will kind of act as a optocoupler.

[@lilyfeng9891]

@@FahadAndFarrukh THANK YOU SO MUCH! if the serial monitor is only showing a bunch of question mark, is it because the light is not strong enough?

[@electronicsandprogramming9794]

@@lilyfeng9891 May be you need to properly set the potentiometer. Are you able to get the first part of the project working? I mean does it work like in 8:26?

[@armanx2]

Now build array of lights to get bigger bandwidth ;)

[@electronicsandprogramming9794]

Actually if we replace the photodiode with a phototransistor we should have a much higher frequency and more bandwidth. If speed is your concern just connect a photodiode to uart it would be much faster, bit-banging has its limits.

[@armanx2]

@@electronicsandprogramming9794 I have very limited electronics knowledge , I'm web developer :) thx for tipis though.

[@mehdielmamoun8441]

hello can you tell me the value of the resistence used in the experience for the transmettre and recrever

[@electronicsandprogramming9794]

The Potentiometer has a value of 10K

[@adarshaadhi9455]

how can I separate the strings that were received? i have 5 separate integer value that needed to be retrieved at the end

[@electronicsandprogramming9794]

Hello you need to create a string parser. You can use comma as a delimiter.

[@adarshaadhi9455]

I cant do it. I cant locate the starting of the string. Its seems impossible. Do you have any example code that could be used as a reference. Ive been trying for last 5 days.

[@ItsAnvitGaming]

Hii can you give a list of the components you used

[@FahadAndFarrukh]

The components are listed here. create.arduino.cc/projecthub/saad-saif/wireless-data-transmission-using-light-diy-li-fi-69eb0a?ref=search&ref_id=wireless%20data%20transmission&offset=0

[@raghavendramirji2]

Hello, Could anyone tell me if first part (before 8:44) is possible with only one microcontroller (Arduino UNO R3)?

[@frgxcv6164]

2 needed

[@ayosh7886]

How can we transfer any text i don't want him be fixed have any idea

[@electronicsandprogramming9794]

The text can be easily changed, you can see it in the transmitter code. Furthermore you can modify the code to receive text from the computer through serial and then transmit it out.

[@SureshKumar-nk2ok]

sir how can i increase the distance with Li Fi

[@HiHello-h6q]

use laser

[@rainakn8300]

can you please provide the block diagram and methodology. It will be helpful or my projhect

[@FahadAndFarrukh]

did you check out the github repository. Please follow it here. github.com/SaadOjo/DIY_Li-Fi

[@rainakn8300]

Yes, but I want detailing of the project. Can you please tell me how tgis can be implemented in real life? Which implemented practically what all will be the requirements?

[@FahadAndFarrukh]

@@rainakn8300 I tried to add all the details in the video. The connections and procedure is all there. What is not clear please let me know.

[@rainakn8300]

@@FahadAndFarrukh your video 's explanation is awesome. I want to know if we have to implement this on street lights how would it be like?

[@FahadAndFarrukh]

@@rainakn8300 Actually, this setup is more academic than practical. The first thing you should do is to use a photo-transistor instead on LDR as the LDR is too slow for any practical speeds. Also it is not the best idea to use software bit-banging instead a hardware based solution would be better. As a matter of fact the UART of the Arduino can be used directly and the TX RX lines can be replaced with a fast led and a photo-transistor. If you really wanted to use on the street as a practical solution the best way would be to replace the physical layer of the OSI model from ethernet to a custom lifi based solution. If you are interested I can try to do that and make a video on it.

[@ajayreddy6845]

Can u help us with code for getting output on lcd

[@electronicsandprogramming9794]

Hello. You can use this video as a guide. Where we have Serial.write() replace it with lcd.print() and it should work. :) Let me know how it goes.

[@Kreo099]

please tell me how didi u received that final message u didnt show us when you send it

[@electronicsandprogramming9794]

I have a send byte function that I call for each byte. You can look at in in the receiver code here. github.com/SaadOjo/DIY_Li-Fi Please let me know if you have any other questions.

[@Kreo099]

@@electronicsandprogramming9794 why i get error after verfiying the code on arduino if u can send me the code of both trans and receiv thnk u very much

[@electronicsandprogramming9794]

@@Kreo099 can you please send me the error. You can open an issue on the github repository.

[@Kreo099]

@@electronicsandprogramming9794 i have copy the same code you type it in the video and look what i get like error Arduino: 1.8.13 (Windows 10), Board: "Arduino Uno" FU:5:23: error: expected initializer before 'setup' char* string = "this " ; ^~ C:\Users\abdelkrim\Desktop\FU\FU.ino:5:16: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] char* string = "this " ; ^~~~~~~ FU:8:1: error: expected initializer before 'void' void setup() { ^~~~ C:\Users\abdelkrim\Desktop\FU\FU.ino: In function 'void loop()': FU:17:21: error: 'string_lenght' was not declared in this scope for (int i = 0; i < string_lenght; i ++); ^~~~~~~~~~~~~ C:\Users\abdelkrim\Desktop\FU\FU.ino:17:21: note: suggested alternative: 'strnlen_PF' for (int i = 0; i < string_lenght; i ++); ^~~~~~~~~~~~~ strnlen_PF FU:19:20: error: 'i' was not declared in this scope send_byte(String(i)); ^ FU:19:3: error: 'send_byte' was not declared in this scope send_byte(String(i)); ^~~~~~~~~ FU:19:23: error: expected ')' before ';' token send_byte(String(i)); ^ FU:20:3: error: expected primary-expression before ')' token ) ^ C:\Users\abdelkrim\Desktop\FU\FU.ino: At global scope: FU:24:1: error: expected unqualified-id before '{' token { ^ exit status 1 expected initializer before 'setup' This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.

[@electronicsandprogramming9794]

@@Kreo099 okay thank you for the error. I will correct it and update the repository.

[@MrZero-se6hb]

Your Voice is very low. I am listening on full sound volume

[@sajjadkhan-gc2gp]

hello can anyone help me please what is the name of this other module used in the circuit

[@electronicsandprogramming9794]

Hello Sajjad, What module are you referring to?

[@sajjadkhan-gc2gp]

@@electronicsandprogramming9794 i got i was talking about Arduino nano ,sir let me know i use both uno instead of one nano circuit will work

[@electronicsandprogramming9794]

@@sajjadkhan-gc2gp Hey, Sajjad. It doesn't matter which one you use. As long as you use the same connections it should work. :)

[@electronicsandprogramming9794]

@@sajjadkhan-gc2gp Yes it will work

[@EEffectStudio]

Where can i change the text?

[@electronicsandprogramming9794]

In the code there is a string around the top, you can change it from there.

[@EEffectStudio]

@@electronicsandprogramming9794 do you mean the char text right?

[@electronicsandprogramming9794]

@@EEffectStudio Yes indeed :)

[@rasheedataliep5757]

[@summerkrinsky5369]

Didn't have a potentiometer so was trying this with just a 1k resistor -I had to change the threshold up to 400 to be accurate to the range I was getting out of the photocell- I am getting binary data transferred but it is not correct. It is consistently the same incorrect binary numbers corresponding with ascii characters- any suggestions? Really appreciate any ideas you might have thanks!

[@summerkrinsky5369]

also because of this higher threshold I tried slowing it down to 1000 as the period on receiver and transmitter and still not working

[@electronicsandprogramming9794]

Were you able to get the first part of the code to work?

[@nanagogo7832]

@@electronicsandprogramming9794 I have the same problem! The initial test goes well, but no matter how I change the threshold the characters do not appear in the serial monitor. Please help!

[@asphalt9phoque551]

Hello. I think you will have to use potentiometer to change threshold of the ldr. If you don't have it, try to cover the LDR so that only the light of leds can reach it, like in a dark room

[@sevgirumeysayldz1361]

Hello, I tried to do this project but the serial moniter not show any thing why ? Can you help me please