HC-05 Bluetooth Module with Arduino-MIT App Inventor

แชร์
ฝัง
  • เผยแพร่เมื่อ 19 ธ.ค. 2019
  • Lets learn how to use HC-05 Bluetooth Module with Arduino Uno. In the end, we'll learn from writing arduino code to create Mobile App using MIT App Inventor. The lesson start with introduction to classic HC-05 Bluetooth Module. Also we'll explore how to create Android APK and its installation on Android Smart Phone.
    The process is six step as follows:
    1. Setup Circuit HC-05 Bluetooth Module and Arduino Uno (VCC, Tx, Rx, GND)
    2. Write Arduino Code to control LED using Mobile App
    3. Create Mobile App using MIT App Inventor
    4. Generate APK and send it to Phone using MIT AI2 Companion App
    5. Pair HC-05 Bluetooth Module with Mobile Phone
    6. Finally Test mobile App and Control LED connected to Arduino Uno
    For Any issues watch troubleshoot guide: • Solved Issue: No HC-05...
    Download Files from: github.com/binaryupdates/arud...
  • วิทยาศาสตร์และเทคโนโลยี

ความคิดเห็น • 777

  • @SciencewithRishit
    @SciencewithRishit 2 ปีที่แล้ว +76

    These days very less people care about explaining what is happening in their code and how it is working and even the viewers copy the code from others without understanding it , which is bad. Thank you for explaining !!!

    • @hanumareddy6392
      @hanumareddy6392 ปีที่แล้ว +3

      Ya

    • @supersingersarveshjayan4805
      @supersingersarveshjayan4805 ปีที่แล้ว

      Totally agree

    • @Silentmessengerqun
      @Silentmessengerqun 11 หลายเดือนก่อน +1

      Thank you. I totally agree and it’s sad😢

    • @brunodragas8661
      @brunodragas8661 4 หลายเดือนก่อน +2

      @SciencewithRishit, I have a problem, I am able to pair the module with my phone but the part when he opend the app and clicks the button to find the devices, there is just blank for me, there is no device shown. Can you please help?

    • @SciencewithRishit
      @SciencewithRishit 4 หลายเดือนก่อน

      @@brunodragas8661 Give me some time I will tell you.

  • @boyano8
    @boyano8 4 ปีที่แล้ว +2

    Thanks to add so many details on this video, is not usual to have long videos in youtube but this one was very helpful to understand the whole picture.

  • @gogreen6604
    @gogreen6604 3 ปีที่แล้ว +8

    I've seen many such videos, but yours is the best imo because I am not familiar with programming but your video made it so simple to understand. Thank you and keep them coming 👍

    • @xeither289
      @xeither289 2 ปีที่แล้ว +1

      JESUS IS THE KING OF THE KINGS

  • @gartmorn
    @gartmorn 3 ปีที่แล้ว +29

    Great tutorial which covers everything you need to know to use hc-05 with your phone. It is especially good for beginners. Keep up the good work.

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

    • @VickidYT
      @VickidYT ปีที่แล้ว

      @@xeither289 God

  • @festusabayomi3917
    @festusabayomi3917 3 ปีที่แล้ว +21

    Your tutorial is amazing, simple and very clear. Great job

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

  • @albundy3166
    @albundy3166 3 ปีที่แล้ว +4

    Thank you for this, i never thougt it could be so easy to connect my phone to arduino

  • @GaryMcKinnonUFO
    @GaryMcKinnonUFO 4 ปีที่แล้ว +15

    Thanks for the detail, great stuff.

  • @navybrandt
    @navybrandt ปีที่แล้ว +2

    I know this is an older video, but thanks! I'm excited to use this in a project of mine.

  • @lordofdawn6871
    @lordofdawn6871 2 ปีที่แล้ว

    I clicked this 👍 ,because you explained very well and very simple.Thanks!

  • @anokhautomation4453
    @anokhautomation4453 3 ปีที่แล้ว

    Congratulations Mr UMESH.i am ramesh here, expecting more helpful tutorials from you.

  • @josiahmitchell530
    @josiahmitchell530 4 ปีที่แล้ว +6

    Thanks. Great tutorial and very helpful for learning!

  • @edkrest
    @edkrest ปีที่แล้ว +4

    Man... You were born with the explanation gift. Keep up with the good work.

    • @BINARYUPDATES
      @BINARYUPDATES  ปีที่แล้ว +1

      Hi Eduardo, Appreciate your kind words
      Good luck and best wishes!
      Thank you so much

  • @imvijayan
    @imvijayan ปีที่แล้ว

    Thank you very much for teaching the method in the easiest way that any one can understand easily.

  • @garyjones3364
    @garyjones3364 3 ปีที่แล้ว +1

    Thanks, you explained so much in such little time. Thanks!

  • @anokhautomation4453
    @anokhautomation4453 3 ปีที่แล้ว

    Nice tutorial ,very well explained ,i am already created an app by following your instruction.thank you very much.post again same like helpful tutorials .

  • @ferrey7121
    @ferrey7121 3 ปีที่แล้ว +1

    Thank you so much, your video help me a lot. Your explanation is the best❤

  • @abhijitrashinkar
    @abhijitrashinkar 3 ปีที่แล้ว +3

    Hello! Umesh (if I have not mistaken)
    I must say what a perfect tutorial, I appreciate all your efforts and time, everything was so neat and clean, many many thanks for this video, thousand likes from me.
    Abhijit

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Thanks Abhijit for your word. It means a lot for me.
      Wish you a good day

    • @brunodragas8661
      @brunodragas8661 4 หลายเดือนก่อน

      ​@@BINARYUPDATES I have a problem, I am able to pair the module with my phone but the part when he opend the app and clicks the button to find the devices, there is just blank for me, there is no device shown. Can you please help?

    • @fedironaldo
      @fedironaldo 3 หลายเดือนก่อน

      ​@@brunodragas8661me too

  • @art_drag9488
    @art_drag9488 4 ปีที่แล้ว +3

    What a super tutorial...i hope you make other app inventor tutorlal like this

  • @jherico2534
    @jherico2534 6 วันที่ผ่านมา

    This one fix my connection issues, Great job brother!

  • @ngotrongnghia5084
    @ngotrongnghia5084 ปีที่แล้ว +2

    Thanks for the video man, very detailed and easy to understand. But if I want to catch the GFSK signal, which software should I use ? (I am doing the circuit on Proteus)

  • @julio10004
    @julio10004 3 ปีที่แล้ว +1

    Why do you need the Serial.print(Incoming_value) and "
    "? is it required by the blue tooth protocol to echo back what you received? I am curious because no class is listening, so they would just accumulate in the blue tooth buffer. Or are you using simultaneously the monitor through the USB interface?

  • @MegaPaulster
    @MegaPaulster 4 ปีที่แล้ว +1

    All worked! thanks a million!

  • @patelaneesh9542
    @patelaneesh9542 ปีที่แล้ว

    Thank you so much, better than any proffesor.😎

  • @naboulsikhalid7763
    @naboulsikhalid7763 ปีที่แล้ว

    the explanation, the details of all process of creating the app make this youtuber a best example to follow. Thank you. you got huge LIKE and SUB

    • @BINARYUPDATES
      @BINARYUPDATES  ปีที่แล้ว

      Thanks you Naboulsi for your kind words.

  • @andresr.acostam.8070
    @andresr.acostam.8070 4 ปีที่แล้ว +2

    From Colombia,
    it works perfect

    • @BINARYUPDATES
      @BINARYUPDATES  4 ปีที่แล้ว

      Hi Andres,Thanks for leaving comment

  • @croftpianos8294
    @croftpianos8294 4 ปีที่แล้ว +3

    thank you for a brilliant tutorial

  • @asthayadav518
    @asthayadav518 2 ปีที่แล้ว +6

    Thank you so much for the video sir!❤
    I wish I could have found this earlier🤗

  • @suvrodeepdas1220
    @suvrodeepdas1220 3 ปีที่แล้ว +1

    The Most Detailed Tutorial ever!

  • @AppuTheLabrador
    @AppuTheLabrador ปีที่แล้ว

    Thanks So much for explaining it soooo clearly.. I had tried this project with many other videos but all failed.. Yours succeded.. TYSM!

  • @sjarmantemeisie
    @sjarmantemeisie 3 ปีที่แล้ว +1

    I want to ask if this tutorial can also be used for the nrf24l01 module?
    thankss

  • @makgadget9167
    @makgadget9167 2 ปีที่แล้ว +1

    Thanks it helped a lot I never thought app inventor would be so useful

  • @baseermirza2947
    @baseermirza2947 4 ปีที่แล้ว +2

    This was such a great explanation. Thankyou!

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Glad it was helpful for you Mr. Baseer. Thanks

  • @waronua4kiwis
    @waronua4kiwis ปีที่แล้ว

    Thankyou for your effort in making this tutorial. I got it working with Serial1 on a Pro Micro 32U4

    • @BINARYUPDATES
      @BINARYUPDATES  ปีที่แล้ว

      Hi Cliff, Glad it helped
      Have a good day
      Thank you!

  • @wagnermouradossantos5716
    @wagnermouradossantos5716 3 ปีที่แล้ว +1

    It is an amazing class. Thanks for sharing.

  • @harry._fr4108
    @harry._fr4108 3 ปีที่แล้ว +1

    where theres a bulb,can I use a motor and instead ofa USB cable can I also use a 6v battery

  • @Kwatch
    @Kwatch 3 ปีที่แล้ว +1

    the bt module is 3.3v and arduino is 5v on rx and tx so how did you connect it without blowing it up. I've been told to use resistors to reduce voltage. can you confirm if this is necessary or not

  • @arkarwin3730
    @arkarwin3730 3 ปีที่แล้ว

    Thank you so much bro. It is easy to understand that you explain. It is very helpful for me.

  • @julio10004
    @julio10004 3 ปีที่แล้ว

    Thanks! Super clear! Appreciated

  • @efiratoglu
    @efiratoglu 3 ปีที่แล้ว +1

    You made my day! Great details, great content! Thumbs up!!!

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Awesome! Thank you Mr. Ender

  • @sandronani730
    @sandronani730 8 หลายเดือนก่อน

    Thank you very much my friend!!! Simple essencial explanation.

    • @BINARYUPDATES
      @BINARYUPDATES  8 หลายเดือนก่อน

      Hi Sandronani, Welcome my friend!
      I hope you enjoyed this Bluetooth HC-05 video
      Have a good day!

  • @daddyroy9913
    @daddyroy9913 3 ปีที่แล้ว

    thankyou so much sir
    I got many things from your video
    i like to make more such programme so we can undertand to creat application using this site

  • @mog99lie
    @mog99lie 3 ปีที่แล้ว +1

    Thank you, it works great and got me started with bluetooth.

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Hi Mr. Robert, Glad it helped you. Cheers

  • @donthulalaya6800
    @donthulalaya6800 2 ปีที่แล้ว

    Thank You so much.It's a clear video.It helped me with my college project

    • @BINARYUPDATES
      @BINARYUPDATES  2 ปีที่แล้ว +1

      You are most welcome Donthula

  • @anands6127
    @anands6127 ปีที่แล้ว

    It worked till now!Able to do it first attempt

    • @BINARYUPDATES
      @BINARYUPDATES  ปีที่แล้ว +1

      Congratulations Anand
      Best wishes!

  • @bryanbischoff1008
    @bryanbischoff1008 3 ปีที่แล้ว +2

    Great Tutorial! Thank you for taking the time to make this =)

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Hello Bryan, Glad it was helpful!

    • @naveedzahid9272
      @naveedzahid9272 3 ปีที่แล้ว

      I have also made the same circuit but it also works on ac power also check out this link
      th-cam.com/video/1NLt_T59LSg/w-d-xo.html
      Same code and Same app used
      In link go and check out

  • @aarontello6085
    @aarontello6085 3 ปีที่แล้ว +2

    ¡Gracias! Me sirvió mucho, muy bien explicado

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

  • @erfanelmtalab5117
    @erfanelmtalab5117 3 ปีที่แล้ว +1

    Really great tutorial! Thanks a lot

  • @TheDanzman1211
    @TheDanzman1211 2 ปีที่แล้ว +1

    THIS IS A GREAT TUTORIAL!!! You should be a professor! I like the accent too 😀

  • @tinothankachen4405
    @tinothankachen4405 2 ปีที่แล้ว

    How can we understand which digit is uploaded for each function (on or off) in the app.
    Example like 'Arduino Bluetooth rc car' which is available in play store

  • @isuposs
    @isuposs 3 ปีที่แล้ว +1

    This was a helpful video. Thanks!

  • @roy_shuvo
    @roy_shuvo 4 ปีที่แล้ว +1

    thank you bro.... great tutorial

  • @lauriegraham5924
    @lauriegraham5924 2 ปีที่แล้ว +1

    Awesome instructions it was easy to follow and worked great. Thanks for sharing.

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

  • @sagarsavaliya5460
    @sagarsavaliya5460 3 ปีที่แล้ว +1

    Such a nice explanation. Thanks

  • @shahruliman5544
    @shahruliman5544 4 ปีที่แล้ว +2

    thanks for the video tutorial :)

  • @muralisaravakota3082
    @muralisaravakota3082 2 ปีที่แล้ว

    Bro. Your tutorial as easy as 'ABC' to learn, Thank you.

  • @stevemcgowan3017
    @stevemcgowan3017 3 ปีที่แล้ว

    hi i have campervan with solar and 3 mppt controllers.vw t4.would like to make arduino control with touchscreen display.nextion lcd led screens i @t trying to learn,ive got arduino uno r3 will that work.?so battery voltages usually 12.2v to 14.5 when solar or dc to dc charger on when running van .and want to use blutooth module to monitor from house with van outside.what do you think?steve

  • @MrNomercy2012
    @MrNomercy2012 2 ปีที่แล้ว

    Learnt how to create and generate app. Overall it was a good learning experience as i am a beginner. Thank you very much.

    • @BINARYUPDATES
      @BINARYUPDATES  2 ปีที่แล้ว

      Hi Venkat, Glad it was helpful!

  • @kknmitkelompok3889
    @kknmitkelompok3889 11 หลายเดือนก่อน +1

    hey man thank you for sharing that awesome knowledge
    i just wanna ask you something, if i want to add some feature to that app, the feature is add alarm notification in that app when the bluetooth connection suddenly lost
    so, how i build the codeblock with that condition?

  • @abdelwahebtrabelsi8294
    @abdelwahebtrabelsi8294 3 ปีที่แล้ว

    Very clear and nice tutorial. Thanks

  • @palomaramirez2360
    @palomaramirez2360 4 ปีที่แล้ว +4

    Thank you very much, you are a life saver! :D

    • @BINARYUPDATES
      @BINARYUPDATES  4 ปีที่แล้ว +2

      Hey Paloma, Glad it helped You!

  • @kabandajamir9844
    @kabandajamir9844 ปีที่แล้ว

    The world's best teacher thanks

  • @user-dp3fw9vw7j
    @user-dp3fw9vw7j 3 ปีที่แล้ว

    Спасибо за видео. Хоть я и не пониммю английский, но я все понял как делать.
    Thank you for the video. Although I do not understand English, I understood how to do everything.

  • @farahmahdi4771
    @farahmahdi4771 2 ปีที่แล้ว

    Thank you sir God bless you

  • @akinaktas9093
    @akinaktas9093 7 หลายเดือนก่อน +1

    Good job! 👍👍👍👍

    • @BINARYUPDATES
      @BINARYUPDATES  7 หลายเดือนก่อน

      Thank you Akinaktas!

  • @greggil3454
    @greggil3454 4 หลายเดือนก่อน

    such a nice tutorial without a fuss of setting app mobile app keep on man !

    • @BINARYUPDATES
      @BINARYUPDATES  3 หลายเดือนก่อน

      Glad you liked it. Thanks a lot!

  • @jakubjanzuber
    @jakubjanzuber 3 ปีที่แล้ว +6

    Thank you so much, this video really helped me in my project.

    • @souravb613
      @souravb613 3 ปีที่แล้ว +1

      Tshshdkdmdjdhdjjdjhsud

  • @sindugokulapati9834
    @sindugokulapati9834 2 ปีที่แล้ว

    thank you for the detailed explanation

  • @arduinoprojects4404
    @arduinoprojects4404 4 ปีที่แล้ว +2

    THANK YOU SO MUCH

  • @victordavialmeida8594
    @victordavialmeida8594 3 ปีที่แล้ว

    Hello brother, I'm working in a project where I'm using this tools that you presented, first of all, thanks for the video, second, I'm registering all the references because its a graduation work, I would like to reference your name in my project, I would be very happy bro, thanks !!!

  • @MehsahEditZ
    @MehsahEditZ 6 หลายเดือนก่อน +1

    Bro thank you walla you saved me I have a competition and didn’t know how to make app thank u ❤❤❤❤❤❤❤

    • @BINARYUPDATES
      @BINARYUPDATES  6 หลายเดือนก่อน

      Hi Mehsah, I'm happy to know you found this MIT app inventor and Bluetooth HC-05 tutorial useful. Wish you all the best for your competition. And hope you'll great great bluetooth mobile app. Good luck and Best wishes!

  • @catwatch7569
    @catwatch7569 3 ปีที่แล้ว +1

    Great job..Jazak Allah

  • @circuitdesolator
    @circuitdesolator 3 ปีที่แล้ว +1

    Nice work. Easy to follow and in complete details 👍🏼💯

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Glad you liked it!

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

  • @akrikas3266
    @akrikas3266 4 ปีที่แล้ว +1

    i need to send 'rfid UID' information to the remote Xbee from router Xbee connected to arduino uno. im much annoyed.could you please help me !

  • @MuratBuyukaksu
    @MuratBuyukaksu 4 ปีที่แล้ว +2

    Great video. Thanks.

  • @asmaechouiya3602
    @asmaechouiya3602 3 ปีที่แล้ว +1

    thank youu for all details

  • @mishrajit
    @mishrajit 3 ปีที่แล้ว

    Great work, dude..keep it up.

  • @mikehensley78
    @mikehensley78 3 ปีที่แล้ว +1

    Great tutorial! You can also change HC-05 Name and PIN. I had no idea about the MIT inventor app. Are you going to make more tutorial videos about the HC-05? I subscribed just in case you do! :)

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

  • @TheUSDesigners
    @TheUSDesigners 3 ปีที่แล้ว

    Is it possible to have bluetooth model for communicate with 5 same bms ?? because all those bms have the same signal and only the last bms connected is capted by the application and the 4 others are like witthout bluetooth signal ! (ANTBMS and MYBMS APP)

  • @constantinmarginean3644
    @constantinmarginean3644 4 ปีที่แล้ว +1

    very good tutorial, thanks

  • @theo74828
    @theo74828 9 หลายเดือนก่อน

    Well... There is just one thing I want to tell you: THANK YOU!

    • @BINARYUPDATES
      @BINARYUPDATES  9 หลายเดือนก่อน +1

      Thank you so much! I hope you enjoyed this video.
      Best wishes!

  • @clusterbx
    @clusterbx 2 ปีที่แล้ว

    Hi. This is a very good video for a newbie like me. Please made more of such videos. Thank you very much. Appreciated your sharing.

    • @BINARYUPDATES
      @BINARYUPDATES  2 ปีที่แล้ว

      Hi Steven, Glad it was helpful!
      I'll surely adding more content in days to come around Arduino and Bluetooth
      Best wishes
      Umesh

  • @rubenquintanar6612
    @rubenquintanar6612 3 ปีที่แล้ว

    This is the *** ONLY *** Video tutorial that i tried and it actually WORKED!!!
    Thank you so very much for making it so very detailed and yet simple for novice users.

    • @xeither289
      @xeither289 2 ปีที่แล้ว

      JESUS IS THE KING OF THE KINGS

    • @georgejetson4378
      @georgejetson4378 ปีที่แล้ว

      @@xeither289Really? What about Allah? or Zeus?, or The Flying Spaghetti Monster? I bet my God can beat up your God!

  • @guilloip
    @guilloip 3 ปีที่แล้ว +1

    Thanks, I was great. Only one suggestion: the returning value of funtion "BT.connect_to(List1.Selected)" is true o false, depending if the connection is succesful or not. So you should restore it in "List1.Selected" because it has no sense , but, more important, becuase it might be confusing for the one watching your video. You should store it in a temporal variable, or, even better, check it and do somthing if it is false.

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Good point! I'll make sure while making next video lesson on HC-05 Bluetooth Module with Arduino. Thanks for your suggestions. I appreciate it

  • @ouchanihida3327
    @ouchanihida3327 3 ปีที่แล้ว

    You advise me what type of GBS modules that will be compatible with a Bluetooth module and at the same time an SD card . You can advise me because I'm a little lost thank you

  • @momeerehman973
    @momeerehman973 4 ปีที่แล้ว +1

    Your videos is so in4mative and helpful. And your guidance mathod is amazing and easy for us, keep it up bro👏👍

    • @BINARYUPDATES
      @BINARYUPDATES  4 ปีที่แล้ว

      Thanks Momee, for encouraging words.

  • @creationworld5396
    @creationworld5396 3 ปีที่แล้ว

    You r genious sir,👍👍👍

  • @Labibatuabubakar4
    @Labibatuabubakar4 3 ปีที่แล้ว

    Thank you Sir.Allah bless you

  • @manjunathggavadi6936
    @manjunathggavadi6936 3 ปีที่แล้ว

    Plz teach how to create application by using Arduino, FSR, LED, Resistor, DC motor, Wifi module, DC motor driver, battery and potentiometer in one application, your way of creating and making us understand is good
    It helps us to create application easily

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      Yes Manjunath, those video lessons are on the list. Hope I'll make it and share soon on TH-cam Channel to cover all interfaces like WiFi, DC Motors, Servo Motors, Potentiometer etc with Arduino

  • @JontheRippa
    @JontheRippa 3 ปีที่แล้ว +1

    Wow Perfect 👌👍

  • @alexstr2905
    @alexstr2905 3 ปีที่แล้ว

    Thank you for this Tutorial

  • @blyzz_0
    @blyzz_0 3 ปีที่แล้ว +1

    I'm on Itceh cours and its cool bro from la baguette

  • @curiousman4614
    @curiousman4614 ปีที่แล้ว +2

    THANK YOU!!!

  • @mattimalo2894
    @mattimalo2894 3 ปีที่แล้ว

    Thank you of this!

  • @deepyaa3392
    @deepyaa3392 3 ปีที่แล้ว +1

    Can anyone explain how serial available is used and when we should use it?

  • @jabezadamraj
    @jabezadamraj 3 ปีที่แล้ว

    excellent tutorial.... thank you...

  • @manotoshsarkar6863
    @manotoshsarkar6863 3 ปีที่แล้ว +1

    Nice and detailed.

  • @assoumlabidi7313
    @assoumlabidi7313 3 ปีที่แล้ว +1

    thanks , great tutorial, that's exactly what i need

  • @yogeshchaudhari5833
    @yogeshchaudhari5833 3 ปีที่แล้ว

    THANKS SIR THIS WAS VERY HELP FULL VIDEO I AM TRYING AND IT DONE IN FIRST ATTEMPT

    • @BINARYUPDATES
      @BINARYUPDATES  3 ปีที่แล้ว

      You're welcome. Good luck for your very first Bluetooth Project

  • @pankajshevate
    @pankajshevate 3 ปีที่แล้ว +1

    Its much helpful. Thanks for the video.
    Could you please help me creating sound equiliser using laptop mic, arduino bluetooth and led strip?

  • @SciencewithRishit
    @SciencewithRishit 2 ปีที่แล้ว +1

    How can you directly connect a 3 volt LED to 5 volts without burning it? And Bluetooth module also?