How to Pair HC-05 Bluetooth Modules

A fast explanation on how to pair two HC-05 bluetooth modules!
!!!!!!!PLEASE READ IF YOU ARE HAVING TROUBLE PAIRING YOUR BOARDS !!!!!!!
COMMON ISSUES:
Issue 1: This method works ONLY with an Arduino UNO. (edit: One user claims it works with an Arduino Mega as well but I have not tested myself. Could be an option if you have a Mega). Once the boards are paired you can use whatever you want, but for programming in AT Command mode you MUST use an UNO.
Issue 2: Some boards require the button to only be held during power up (as seen in video). Some boards require the button to pressed at power up AND when hitting "enter" on AT commands. Some boards require the button to be held at ALL TIMES in AT mode.
Issue 3: ERROR: (7) when trying to use the AT+BIND command. Your address be entered in this exact format XXXX,XX,XXXXXX 4 characters (comma) 2 characters (comma) 6 characters. If the address given by the slave module is not in this format, you must add zeros at the beginning of the section to make up for it. i.e. If the address given by your slave is 13:EF:C76A you would enter that as 0013,EF,00C76A. If the number of characters is correct an you're still getting the error; check that you do not accidentally have a space at the end of your string (very common).
Issue 4: The Baud Rate for AT Command Mode is 38400. The default Baud Rate for communication between modules is 9600. This can be changed with the command AT + BAUD
If you are still having trouble, post in the comments. I also offer pre-paired boards from my store: www.patrickstefanski.com/store
NO-INTRO TUTORIALS - Don't you hate when the first 10 minutes of video is the creator talking about what he's going to be doing and why he is going to do it? GET TO THE POINT! No-Intro Tutorials are designed to cut to the chase and dive right in.

[@PatchBOTS]

If this process isn't working for you, please read the video description. I've updated it with a few of the most common problems. If that doesn't help, search through the comments, i try to respond to every question. If that doesn't work, post your new issue in the comments and I will get to it. If that doesn't work, I sell pre-paired boards in my store. Link in the description!

[@maulanafahman9332]

bray ngubah ke 38400 baud ratenya gimana

[@JonahStubbs]

Did you do this for your clone comm pad?

[@JonahStubbs]

And could you make a video all about your clone comm pad because I want to do what you did but I’m not sure how you did it and would like an explanation and how-to.

[@ArcaneStellaris]

It worked for me with an arduino mega for AT Command mode stuff

[@PatchBOTS]

@@ArcaneStellaris that's great to know, I'll add it to the description

[@MakerProjectLab]

Great explanation. Clear and concise. Well done. Subscribed.

[@PatchBOTS]

Maker Project Lab perfect!

[@PatchBOTS]

After checking out your channel I sub'd right away. Really looking forward to going through your video roll. Great stuff!

[@vedansh29]

tHE MOST EASY VIDEO FOR THE THING I SEARCHED FOR

[@PatchBOTS]

Thanks!

[@mewintle]

Super clear and concise. I wish all instructional videos were this good! Thank you!

[@PatchBOTS]

Really nice feedback thanks!

[@andrewmagdaleno5417]

This video really helped out a lot thank you for the clarity and speed!

[@tchiltchil]

Great video and explanations.Thanks from Nairobi

[@BHANUPRAKASH-nc8hz]

It worked , with easy with your clear cut explanation , thank you very much sir.

[@reinerhildebrand5915]

Excellent tutorial! Clear explanations, no intro, no background music, no bla-bla, just pure information. Greetings from Berlin!

[@ELECTRICALTOOLBOXPH]

Thank you so much! Brief and concise..

[@adkeco]

You gave me all I needed to know... in 5 minutes. Outstandingly clear and concise. Cheers!

[@Tokke_ALT]

Its a very good and clear video. Can u make another video that you program a simple ting with it like a press on a button sends signal to the slave and lights up a light. Can u also make another video where u can send with both that u can use them like a chat, or is it not possible.

[@devindavis1833]

This would a fantastic addition

[@hasanadmani6388]

amazing tutorial finally got everything to work great job!!!!!!!!!!!!!!!!!!!!

[@kingsleyjide4486]

New subscriber here! this video was concise and full of value.. I have a question, is it possible to add more than one address for the master to connect to whenever any of the added addresses are in range?

[@PatchBOTS]

Not that I'm aware of, but check more recent firmware guides.

[@DanGahagan]

I was trying to do this with a Arduino Nano and was not successful. Bought a Arduino Uno and it took 2 minutes =) Thanks!

[@PatchBOTS]

Great glad you found the solution!

[@jozzetrick]

Hi, I have a HC-5 and when I try to repower it using my power supply it worked but 5 second after it didn't work anymore the light is not blinking, and the resistor is very hot it even melts the plastic cover in it. Do you know how to fix this problem?

[@ilikekids8095]

It fried up.go buy another one pal

[@dashl5069]

it is not working with my nano, it has had other problems like not using the normal USB drivers (SDTI are the most common I believe) however I cannot see why this would not work, any ideas? Thanks

[@PatchBOTS]

@swishy _ fishy In the end you can use a Nano for your project, but it appears you need to use an Uno to do the AT mode commands. Others have had the same issue using a nano which was resolved by switching to the Uno.

[@gpTeacher]

Thanks very much for very clear instructions!

[@PatchBOTS]

You're very welcome! Glad it worked for you!

[@davidhead6549]

Cannot get HC-05 to accept AT commands. Have followed instructions to the letter on two different modules, with two different Unos, and two different sets of jumper wires. Have tried all of the

[@PatchBOTS]

Sorry not sure what could be wrong there.

[@enestastan7147]

I have a question. What about the passwords that we configured? I applied exactly the same procedure but master could not connect to slave just because I have changed 1234 default password to something else. When I reconfigured the slave's password to be 1234 master could connect to it? If pasword matters (which seems so) how can we let the master know or bypass the password of the slave?

[@arivnidunami3047]

what i looking for, thanks. good video.

[@webslinger2011]

Need to add zeros for binding the address if not complete. Also, I've used Invootech method to connect the modules.

[@ajayjoseph4626]

kzbin.info/www/bejne/eIm7cpZ8hLmheNEm32s This is incorrect. If you want to transmit data or to enter AT command on ARDUINO connection should be made tx - tx and rx - rx. In case of FTDI modules its cross connection tx-rx and rx-tx for both purpose. I spent half a day trying to fix it following this tutorial so please rectify it.

[@PatchBOTS]

The method in the video works for the boards listed in the description of the video. I run all my bots wiht Rx->Tx Tx-->Rx to transmit. Sorry if you had trouble.

[@mcbain2k]

should be tx - tx and rx - rx for AT Command Mode this is said in the Video before. tx-rx and rx-tx is for Arduino cross communication.

[@luiscostoya7879]

I know others have probably asked but I cant seem to get a response at all from the AT command. I get the show blinking to happen but when I type AT on to command line I get nothing in return. Im on an Arduino Uno, made sure to set baud to 38400, and TX -> TX + RX -> RX. Not sure what could be wrong, any help would be appreciated.

[@steve_lion8563]

I have the same exact issue

[@marsanishadraa]

Great video thank you!! I follow your instruction to write AT in serial monitor and the reply is OK so when I write AT+ROLE=1 there's no response in the serial monitor, what should I do?

[@almeespinosawild2196]

you found any solution?

[@marsanishadraa]

@@almeespinosawild2196 actually I already finish that 2 years ago😅

[@govorilegko]

The best explanation ever on how configure and pair 2 HC-05 modules. Very clear. But I cannot even turn on the light (pin 13) on Slave from Master. I don't understand what I do wrong way. Can you make some simple code and really pair 2 modules?

[@PatchBOTS]

What exactly are you trying to do? What input are you trying to use on the master side to turn the light on on the slave side?

[@govorilegko]

everything is okay, thank you

[@EVERYTHING-tw5vm]

thanks alot

[@IanZ_Forge]

Thanks mate! This helped a ton! God bless

[@ashinthaCARBON]

huy, I did the same thing as "AT+ROLE=1" it says ok, but when I try to verify it's still in the slave mode. Can you tell me how to fix it

[@Rotellini-9809]

hey hope you see this comment, i followed the procedure with an arduino uno everything is ok the module respond ok to every command i send but when i try to change the role to 1 it just stays 0, even if i get an ok after the command AT+ROLE=1

[@ranidusoysa8789]

In my case it is not bind. when I bind serial monitor shows 'OK' but still not bind. can you tell me why is that? --Very urgent--

[@galacticxranger9863]

i want my bluetooth hc 05 to connect to any device so if I use ur tutorial then I can connect my phone to the slave module and then I can use it . am I correct?

[@wiseThingz]

as I tested, to get into AT command mode, you only need to hold down the button while switching on HC-05. immaterial if u have made EN/KEY pin HIGH

[@emyalfaro]

Thanks a lot for this! New subscriber =)

[@PatchBOTS]

Much appreciated! Thanks for watching, glad it worked out for you

[@emyalfaro]

I got everything working just in 5 minutes! Thanks again!

[@costathiago2562]

Guys an arduino uno outpu is of 5 volts!!!! Dont do what the tutorial says!!!!

[@ziyujin9106]

Great video thank you!! I follow your instruction to write AT in serial monitor but there is a problem in writing AT+BIND. Can I know why?

[@Dheazzo]

Can I use these modules to transmit audio between two devices

[@richard1001001]

Great video. Would you mind if I asked a question? I want to remotely control some 12v lights, but need to use a standard toggle switch. How would you connect a switch to one of these units. I am a new boy to these products so my knowledge is limited. Thank you.

[@PatchBOTS]

Well it would be connected to a microcontroller on both ends so connect the switch to that and transmit the on/off data

[@dgrek9459]

Yeah its very similar to wireless controlling of an LED just you will need to wire your micro controller to your 12V power supply and lighting to give it the input from the switch which is also wired to a separate micro controller

[@munch15a]

So ive gotten it too AT command mode as indicated by the flashing light but thats as far as it goes the serial monitor will not give me any feed back ?

[@dashl5069]

I have this problem too with my nano, what board are you using?

[@josephnavinkumar3089]

im using a uno board but it still dosnt work

[@dgrek9459]

@@josephnavinkumar3089 some hc-05 boards have issues in the 38400 baud rate. There are codes I have found online to allow you to try this same tutorial in the 9600 baud rate. Try looking for these

[@lustrals1273]

I don't have a reset button on my Bluetooth module, please help

[@rohitchaturvedi2271]

Hc 05 logic pins are 3.3 v, UNO is 5 v, can it tolerate ?. I saw in a Great Scott video to use a voltage divider between tx of uno and rx of hc 05.

[@PatchBOTS]

Yes, should be fine without for programming but you should probably use one for regular use

[@nenorse]

For the Arduino Nano - I needed to drop the voltage to 3.3v on the RX Pin by connecting a 1k and 2k resistor. (search google for connecting HC-05 to Arduino Nano)

[@iggyboyTV]

it is possible that thus setup is control by mobile phone?

[@Poult100]

Good tutorial re pace, no padding, no 5h1tty music and once the bid description is read, all is well. One other small comment; the paired flash is not synchronous. They both flash together to begin with but normally gradually drift in timing. Not important but some may worry.

[@andrecartagena3201]

Nice, your also very smart

[@hairiyaacob6289]

great explaination. just a quick question: do we really need to make a potential divider for the TX connection from arduino using 1k and 2k resistors. is it really necessary?

[@PatchBOTS]

hairi yaacob you probably should yes. For just pairing them I haven't had any issues, but for long term use it's definitely on your best interest

[@ZHazarERULUSOY]

How many devices pairing this method

[@MicroModDude]

I’m new to this? You didn’t explain how to wire the boards.

[@ranner3]

So i used arduino mega 2560. During plugin into PC i held button. Beep says i am in AT configuration mode. I set all commands you mentioned and i was getting response OK. After test my bluetooths are able to pair because they both blink synchronized but they are unable to communicate and i dont know why.Both have same baud rates. Also i would like to ask i see ur mac address is xxxx.xx.xxxxxx this is format. When i check my mac addres its xx.x.xxxxxx is it because there are 0 digits hidden in it or its weird that i have diff format of MAC than you? Thanks.

[@nicknavarrete2838]

Hey, Ive been working with them using a different micro, UART is working, Role and CMODE are working. For whatever reason, the address I try to bind is not remembered by the HC-05. Any ideas?

[@robGamings08]

Hey so I followed your video, (great job by the way!), and they are blinking twice every 2 seconds like they are paired, but it’s back and forth and not synchronized. Is it still paired? I couldn’t find anything wrong with what I did.

[@lania4334]

Isn't it bad to take the pin directly to the Arduino without using resistor does it not damage the Bluetooth.

[@newtech6641]

i need a coding for this connectivity (aurdino ide)

[@amizu1006]

I succeeded in making the HC-05 blink slowly, but there was no response when I opened the serial monitor and entered AT twice (I entered the command within a second). serial monitor set to 38400 baud, I used an Uno R3

[@davidhead6549]

By the way, an excellent video.

[@davidhead6549]

fixes in the description.

[@thomasrokicki]

How to enable AT Command mode with no button?!

[@PurpleM13]

Is it possible to bind the master to 2 slaves ?

[@Greebstreebling]

Mmmm, what about the 3.3V logic level requirement? The HC05 Rx pin might survive for the duration of testing, but longer term you'll kill your HC05. It needs a logic level shifter for long term use, as per datasheet.

[@PatchBOTS]

Yeah you're totally right. A voltage divider is needed for long term use.

[@glindquist5635]

Thank you so much, saved me a lot of frustration!

[@isabelpestana1081]

Great video!! One question tho, can I use a arduino nano after?

[@PatchBOTS]

Yes. UNO is only needed for programming. Then you can use anything you'd like.

[@isabelpestana1081]

@@PatchBOTS thank you so much!!

[@davidhead6549]

Cannot get HC-05 to accept AT commands. Have followed instructions to the letter on two different modules, with two different Unos, and two different sets of jumper wires. Have tried all of the fixes in the description. Odd thing is the modules appear to be in programming mode with or without pushing the button at power up.

[@PatchBOTS]

I know you said you did everything to the letter, just double check these two things: 1. Your baudrate is set to 38400 in the Serial Monitor. 2. TX-->TX RX-->RX

[@byungshin8773]

Hi I do not know if you are still answering questions, but I am able to follow your steps to a tee except when I switch to the other bluetooth module. When I do, I am unable to get a response from the serial monitor. No matter how many times I type "AT", nothing seems to come out. Is this a problem with my own bluetooth module, or is there something I missed in the video?

[@PatchBOTS]

Troubleshooting: 1. Are you using an Arduino UNO? You must use an UNO to program. 2. Is the light doing the slow, long blinks representing AT COmmand Mode? 3. Is there a blank sketch uploaded to the arduino? 4. Is your serial monitor set to 38400 baud? If the answer to all these questions is yes then you may have a busted module, try another module with the same method to confirm.

[@julianwebb7477]

Hi, I follow all the steps but when it comes to sending the AT commands in the Serial Monitor it is not giving me any results back. I am working from a Uno, any idea why this will happen ? Thanks

[@UnofficialEngineering]

baud rate set right? You have NL + CL selected? Not sure about the new Arduino IDE.

[@machwasmakerspace362]

WOW... that's a how to the way I like it!

[@sufferwr1595]

In the part of entering the "AT" In serial monitor with 38400 buad rate both NL& CR No result or anything response

[@sufferwr1595]

nvm thank youuuuu for this, it will help my thesis!

[@pinumallaapoorva6738]

Can we use 1 master & and 3 or 4 slaves sir.....i want to my 3 or 4 bluetooth modules using my mobile Google assistant, is it possible sir? If so could u plzzz give a brief note sir.

[@bufferingmp.018]

Hello pathbots, this was very helpful and I almost finished in less than 10 minutes but I ran into a problem. It says that my modules are binded and stay binded but they won't connect. I'm using an Arduino uno and have checked every step and everything is correct. Not sure why?

[@LewisO.]

OMG OMG OMG OMG OMG YOUR EXPLANATION IS THE MOST SIMPLEST ONE TO FOLLOW AND YOU TALK FAST AND IS WELL SPOKEN MAKES IT EASY TO FOLLOW AND I WANNA BE LIKE YOU WHEN YOU GROW UP SUBSCRIBEDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

[@planker]

I say, let's give it a go. Thanks

[@pratbrat3492]

if you're still having error 7 problem while binding its because the address needs to have certain number of digits and you have to type zero's before the address to have the same number of digits check these websites for more details : forum.arduino.cc/index.php?topic=486438.new#new macaddresschanger.com/what-is-bluetooth-address-BD_ADDR

[@JDesignSwe]

is it possible to pair a master to multiple slaves thru a secure pairing. eg. not use the 'any' command? if yes, how do I setup the AT command for this?

[@venkatmourya5117]

SUPERB EXPLANATION

[@salvo5631]

My problem is at AT Command mode. I bring up my Serial monitor up on 38400 baud . I type in AT in the bar and get nothing not even a error what happened what have I done wrong. Also does it make any difference if i am using a Iphone as i can not see it in my Bluetooth.

[@ouchanihida3327]

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

[@prashanthrk5204]

Is it possible to change the baud rate other than 38400? I want a high baud rate for my application.

[@PatchBOTS]

The default baud rate of AT command mode is 38400 and can not be changed. You can change the communication baud rate. Use the command AT+UART? You'll see the default communication rate it 9600. You can change that to anything you want

[@ppionke]

SHOT AND SHOW ANY STEP NEEDED gj !!

[@morrism6743]

Sir, after all the steps is done, what if the blinking light is not synchronized? But both blinking lights actually get slower but not synchronized

[@46449771]

Very good video. Straight to the point and perfect instructions. Thanks.

[@scitechnotuber548]

Is there any way in which we can define the address of master in the code of slave circuit ?? To connect it directly

[@lozza1950]

Could I use a Arduino mega ADK , board. If possible where is the wiring diagram. Thanks

[@eleftheriostriantafyllidis3012]

Hello! Great Video! Right to the point. One question, do we have to set the AT commands every time we disconnect and re-connect the arduinos ? Or do the HC-05 "remember" their master or slave state ? Thanks!

[@PatchBOTS]

They remember!

[@eleftheriostriantafyllidis3012]

@@PatchBOTS Insanely fast reply, thank you, really appreciate it :)

[@PatchBOTS]

@@eleftheriostriantafyllidis3012 No sweat, if you run into any issues post them here and I'm happy to help

[@eleftheriostriantafyllidis3012]

@@PatchBOTS Oh, you could add in the description that Error (7) may also come up in case the address is two characters less; For example an address FCA8:9A:22ED is two characters less than in your tutorial in the end. This is simply fixed by adding zeros in the end, i.e.: FCA8:9A:22ED00 :)

[@UserBatoste36]

Hello, when I make an AT+ROLE=1, I get nothing and the role keeps being slave (0). Any idea why ?

[@almeespinosawild2196]

Hello did you find any solutions? Im at the same page

[@UserBatoste36]

@@almeespinosawild2196 no unfortunately my module was a fake one and there was nothing I can do to make this command works. Maybe by trying to flash a new firmware, but it's out of my knowledge

[@agungsumantri2109]

Hi.. What if we can't enter to AT mode.. When we type AT then enter, OK not showing..

[@PatchBOTS]

I have some common trouble shooting in the description tot he video.

[@hicks712]

Hi one of the lads in my care has a arduino bat robit with an dsd module do i need a second module to run from his tablet. As with the one module tge d s d hc05 rejects the pairing . Thanks

[@kbruin79]

Great tutorial. This might be Ok for connecting couple pieces what if you have a 100 or 1000 Bluetooth pairs is there a way for two known Bluetooth hardware devices to auto connect?

[@zohaibsiddique6214]

My bluetooth module is not entering in AT mode by pressing the button and powering on arduino.. it keeps blinking fastly.. Can you help me to solve this problem?

[@manjulak6627]

MY SERIAL MONITOR IS NOT WORKING WHEN I PRESS ANY COMMAND IT DOES NOT SHOW ANYTHING PLZ HELP ANYON EAS FAST AS POSSIBLE

[@PatchBOTS]

Are you using an arduino uno?

[@xavierr4508]

Connecting the module's serial lines to 5V might fry it!

[@baitodansu]

Hey! My Module Is Won't Turn On... Is Not Blinking... Please helpme....

[@UnofficialEngineering]

I propose that we start calling "slaves" in computer architecture "servants"

[@antoniosantos6104]

Thank you so much for this video, I was looking for a video that explained it easily and thoroughly!

[@amihemat5130]

thanks, now a question : how we can have directly connecting with HC-05 and headset bluetooth?

[@doctorteeth]

Having tried to get into command mode with a Nano and failed several times, I saw this video - and of course it works with a Uno - but I'm not sure why!

[@Graham1904]

Don't you need level changer on the tx/rx lines as these are 3V3?

[@solanki-mayur7625]

Hello, smartphone connect HC 05 how to HC choice module master/sleve module?

[@emjacob684]

How do I control 2 HC05 modules using 1 phone(ardudroid app)?

[@vincensiusaditya1855]

i cant bind them, when i input the addr, its doesnt response to it with OK or anything

[@vincensiusaditya1855]

there's also no error messages, anyone have the same problem?

[@rubenamoretti1219]

Can you explain about the AT+INIT and AT+INQ commands? I want to use the RSSI property, maybe that can help

[@Osmanity]

TOOK ME 1 YEARS TO PAIR THIS HC-06 AND U MY FRIEND MADE MY DREAM COME TRUE AFTER 100 VIDS WITH POORLY EXPLATION BUT U SAVED ME FROM GIVING UP MY DREAM AND FOR THAT I WANT TO SAY THANK U FROM THE BOTTOM OF MY HEART

[@minugupta9532]

Sir my hc05 is blinking twoceand turning off Can you help me?