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STM32 Communication using Bluetooth Modules || HC-05
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Sep 16, 2023
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View Video Transcript
0:01
[Music]
0:07
thank you
0:09
hello and welcome to controllers Tech
0:12
today in this video we will see how to
0:15
establish the communication between the
0:17
Bluetooth modules
0:19
I am going to use two hc05 modules one
0:23
as the master and another as the slave
0:27
we will first see how to set these
0:29
modules in their respective modes and
0:31
how to establish the connection between
0:33
them
0:34
then we will communicate between two
0:36
stm32 devices using Bluetooth
0:39
so let's start with the h05 data sheet
0:43
first
0:44
the hc-05 can be used in both the master
0:48
and the slave mode
0:50
it supports all kinds of board rates
0:52
used in uart communication
0:55
in default configuration it has the
0:58
board rate of
0:59
38400 with one stop bit and no parity
1:03
the default pairing pin is zero zero
1:06
zero zero
1:08
actually this information can change
1:10
with firmware so we will see it
1:12
ourselves
1:13
we can configure the different settings
1:15
for the module in the at command mode
1:19
so let's put the device in the at
1:21
command mode first
1:23
so here I have both the modules on the
1:25
same breadboard
1:27
let's see the pins available on this
1:29
module
1:31
we have the enable pin which is used to
1:33
put the module in the at mode
1:36
then there is VCC ground TX RX and the
1:41
State pin
1:43
the VCC needs to be between 3.6 to 6
1:46
volts so I will provide 5 volts to the
1:49
module
1:50
first I am going to use the AT commands
1:53
so I am connecting the module directly
1:55
to the ft232 USB to TTL converter
2:00
the connection is going to be a cross
2:01
connection
2:03
the blue wire is connected to the RX of
2:05
the TTL converter so it connects with
2:08
the TX of the Bluetooth module
2:10
similarly the yellow wire connects
2:13
between the TX of the converter and the
2:15
RX of the Bluetooth
2:17
now connect the enable pin to the 5
2:19
volts so the module can go in the at
2:22
mode
2:23
Now power the board and notice the LED
2:26
blinking pattern
2:28
initially both the red and the blue LEDs
2:31
blinks very fast but once the module
2:33
goes into the at mode the red LED blinks
2:36
every two seconds
2:38
this is the confirmation that the module
2:40
has entered the at command mode
2:43
now let's open a Serial terminal to send
2:46
the commands to the module
2:48
this is the port where the USB to TTL
2:51
converter is connected
2:53
we will use the board rate of
2:55
38400 with eight data bits One Stop bit
2:59
and no parity
3:01
let's connect to the device
3:03
make sure to use the carriage return and
3:06
Line Feed to the end of the command
3:08
all right let's send the a t command
3:12
the module returned okay so it is ready
3:15
for communication
3:16
this is the command we sent just now
3:20
I am only going to cover the important
3:22
commands needed for this tutorial you
3:24
can see the rest yourself
3:26
80 plus orgl can be used to reset the
3:30
module back to its original
3:32
configuration
3:33
after issuing this command the module
3:36
goes back into its default configuration
3:38
where it is in slave mode with the
3:41
pairing pin is one two three four
3:43
I am going to leave this module in the
3:46
slave mode and set another module in the
3:48
master mode
3:49
so we would need the address of this
3:51
module
3:52
let's copy this address command and we
3:55
will send it to the module
3:57
the module has returned its address
4:00
we will need this address so the master
4:02
can pair with this module
4:05
we can check the name of the module with
4:07
this command
4:14
here the module has returned its name
4:18
hc05 we can also rename the module to
4:22
something else
4:23
make sure there is no space when you are
4:26
typing a command
4:27
once the module accepts the command it
4:30
returns ok
4:39
the role command can be used to set the
4:42
module in the master or slave mode
4:44
let's check the current role of the
4:46
module
4:51
it is returning an error
4:58
let me type the command myself
5:04
all right the role is set to zero which
5:07
is the slave mode
5:09
we want this module in the slave mode so
5:12
let's leave it to this
5:14
the password command can be used to
5:16
check the pairing pin
5:24
it is set to 1 2 3 4 we can change it to
5:28
something else but I am leaving it as
5:30
default
5:31
the uart command is used to configure
5:33
the modules uart settings
5:36
the first parameter is the board rate
5:38
then the stock bit and at last the
5:41
parity
5:42
currently the module is configured to
5:44
use the board rate of 9600 with no stop
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bit and no parity
5:49
I have no idea how it goes with zero
5:52
stop bits but anyway we will configure
5:55
it ourselves
5:56
we will set it to use the board rate of
5:59
11 5 200 with one stop bit and no parity
6:03
or write the module confirmed the
6:06
settings we used
6:07
we will also configure the SDM 32 in a
6:11
similar way we don't need to worry about
6:13
other commands this is enough to set the
6:16
module in the slave mode
6:18
make sure to keep the address as we are
6:21
going to need it for the master
6:23
all right let's connect another module
6:25
now
6:26
I am connecting the second module in a
6:29
similar way
6:32
now disconnect the power and connect it
6:35
back
6:36
you can see the second module has gone
6:38
into the at mode
6:42
let's continue with the serial terminal
6:46
let's confirm the at command
6:49
all right the module is responding fine
6:53
let's change its name to hc05 master
7:06
we will set this module in the master
7:08
mode so the role needs to be set to 1.
7:12
right now in the default configuration
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the role is set to zero
7:17
so change it to 1.
7:20
all right the role has been changed
7:31
now we need to connect to the slave
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module
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first we will set the connect mode to
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zero so that this module can only
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connect to the fixed address
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and now we will bind the module to the
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slave address
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we already have the slave address so
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copy it
7:59
now replace the colons with a comma
8:07
the module responded okay so it will
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connect to the slave when we power it
8:12
the next time that is all the
8:15
configuration we need
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let's remove the wire and power both the
8:20
modules
8:23
the LED blinks fast when the module is
8:26
not connected to anything
8:28
once the connection is established the
8:31
LEDs blinks twice in every two seconds
8:42
to make sure that the connection is
8:44
established I am going to send the test
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data to one module and receive it from
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another module
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the blue wire is connected between the
8:53
TX of the slave mode and the RX of the
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converter
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and the yellow wire is connected between
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the RX of the master and the TX of the
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converter
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basically the data is going to be
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transmitted from the converter to the
9:07
master
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the master will send the data to the
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slave
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the slave will then send this data back
9:14
to the converter and we should see it on
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the terminal
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make sure to change the board rate the
9:20
communication board rate is set to 11 5
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200. let's and hello
9:26
here we have received the same data back
9:28
to the terminal
9:30
so the connection is established
9:32
successfully and the modules are able to
9:35
communicate with each other
9:36
now let's start the cube ID so to set up
9:40
the things on stm32 controllers
9:43
I am using
9:45
f103c8 and the f446re controllers
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we will start with the
9:52
f103c8 setup first
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give some name to the project and click
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finish
9:58
we will start with the clock setup
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the board has 8 megahertz Crystal on it
10:03
and I am running the system at maximum
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72 megahertz
10:08
now go to uart1 and enable the
10:11
asynchronous mode
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make sure the configuration here is the
10:15
same as what we did for the modules
10:18
the board rate is 11 5 200 with one stop
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bit and no parity
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now go to the nvic tab and enable the
10:27
interrupt
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the pins pa9 and pr10 got selected as
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the uart TX and RX pins
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we will connect these pins with the
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Bluetooth module
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use the cross connection again with TX
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of the module connected to the RX of the
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sdm-32 and vice versa let's enable the
10:48
uart 2 so that we can communicate with
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the computer also
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enable the interrupt again
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the configuration should be the same as
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the uart1
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the pins pa2 and pa3 got selected for
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the uart so connect them to the USB to
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TTL converter
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use the cross connection again with TX
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of the module connected to the RX of the
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sdm-32 and vice versa we always use the
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cross connection as you art so there
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should be no second thoughts here
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that is all the setup we need so click
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save to generate the project
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let's write the code now
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Define an array to store the data
11:32
now in the main function we will receive
11:34
the data in the idle line interrupt mode
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the data will be stored in the data
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array and we will receive a maximum of
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64 bytes at once
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I hope you are familiar with the idle
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line mode if not then check out the
11:50
video on the top right corner
11:52
we will do the same for the uart2 also
11:56
now if all the 64 bytes have been
11:58
received or if the uart detects an idle
12:01
line before that an interrupt will
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trigger and the RX event callback will
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be called
12:07
inside the Callback we will check if the
12:10
interrupt is triggered by the usat1
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if it is then we will send the received
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data to the uart2
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the size parameter holds the actual
12:20
number of bytes received by the uart
12:24
and if it is triggered by the usap2 then
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we will send the data to the uart1
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the hull disables the interrupt after
12:33
each call so in the end we will call the
12:36
receive to idle interrupt function again
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I am passing the parameter huart so to
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make sure the same instance is being
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passed as whichever called this
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interrupt
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all right we are ready with our f103
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code so let's flash it to the board
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now let's create a new project and do
12:56
the same for the f446re
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here I am using the uart4 to connect to
13:08
the module
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this is because the pins are easily
13:12
available for you art 4. we will connect
13:15
another Bluetooth module to these pins
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again use the cross connection to
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connect the TX and RX pins
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the configuration should be the same as
13:26
the others
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enable the interrupt for the uart4
13:31
I am going to use the ur2 to connect the
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f446 to the computer
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the uox2 routes the data through the SD
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link so it doesn't need any additional
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Hardware
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that is it for the f446 let's generate
13:47
the project now
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we will use the same that we wrote for
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the f 1 0 3.
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let's copy it
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here instead of U sat 1 we are using
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uart 4.
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note the names here uart 4 is not you
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start for
14:05
the rest of the code will remain the
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same as the f103
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all right let's build and Flash this to
14:13
the f446
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let me remove the f103 from this
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computer
14:23
I am going to connect one of the
14:25
controllers to this computer and another
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controller to another computer
14:29
both the serial softwares are configured
14:32
with the same settings that we used for
14:34
the controllers and the modules
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you can now see how we will send the
14:39
data from one computer to another
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computer using sdm-32 and the Bluetooth
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foreign
15:00
[Music]
15:04
foreign
15:04
[Music]
15:36
thank you
15:46
so the data transmission is working fine
15:50
I hope you understood how to communicate
15:52
using the Bluetooth modules
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you can directly connect your phone or
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computer to the slave module and use
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some Bluetooth serial software to send
16:03
and receive data
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this is it for this video
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the link to download the code and the
16:10
schematics is in the description below
16:13
leave comments in case of any doubt
16:16
keep watching and have a nice day ahead
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