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How to use HC12 with STM32 || F446 || F103 || 2 way communication
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Oct 4, 2020
Purchase the Products shown in this video from :: https://controllerstech.store ________________________________________________________________________________________ If you got a fake HC12, and range is super low, here is the fix. Just solder the registers as shown by the author :::: https://www.instructables.com/HC-12-Distance-Problems/ if you have any errors in the ring buffer, read the description of the video mentioned below :::: https://youtu.be/1CV3tWlRW5A STM32 Playlist :::: https://www.youtube.com/playlist?list=PLfIJKC1ud8gga7xeUUJ-bRUbeChfTOOBd DOWNLOAD THIS PROJECT FROM :::: https://controllerstech.com/how-to-communicate-between-hc-12-using-stm32/ ________________________________________________________________________________________ ******* SUPPORT US BY DONATING****** https://paypal.me/controllertech *******Join the Membership******* https://www.youtube.com/channel/UCkdqtSMnhYuMsJkyHOxiPZQ/join
View Video Transcript
0:12
[Music]
0:21
hello
0:21
everyone welcome to controllers tech
0:26
today in this video we will see how to
0:28
use hc12
0:30
wireless transceiver with sdm32
0:34
i will first cover how to set up hc12
0:36
for communication
0:38
and later i will use stm32 to do the
0:41
communication between them
0:44
so let's start with the setup first
0:47
here is the hc12 i am going to use
0:52
i have one more obviously and it looks
0:54
like this
0:56
if you compare them side by side you can
0:58
see the difference
1:01
yes i got a fake one but unintended of
1:04
course
1:05
there is crucial difference between both
1:08
the range is an issue for the fake hc-12
1:11
but we can fix it
1:13
and i will leave the link for the fix in
1:15
the description
1:16
i have already fixed the range so i am
1:19
going to use it
1:21
as you can see at the back here we have
1:23
vcc
1:25
ground rx tx and the set pin
1:31
so i am connecting ground to ground 5
1:33
volts to vcc
1:35
tx to rx and rx to tx
1:39
now the set pin must be pulled low for
1:41
the at commands
1:42
so connect that to the ground
1:52
i have connected it to the ftdi serial
1:55
device
1:57
and you can see in the device manager
1:59
the com port is 4.
2:02
so let's open the console.com4
2:12
choose the board rate of 9600
2:22
this 9600 board rate is default for hc12
2:26
and it is mentioned in the data sheet
2:42
let's open the connection type the a t
2:46
and send you can see the response
2:49
from the hc12 let's
2:53
see what other commands that we can use
2:55
here
3:00
this is to change the baud rate to
3:03
change the communication
3:04
channel a t r is used for inquiry
3:14
let's inquire the channel
3:21
i think it's uppercase c
3:26
yes the communication channel is set to
3:30
1.
3:32
board rate is set to 9600.
3:36
[Music]
3:39
you can type at plus rx to inquire about
3:42
all the parameters at once you can see
3:46
the details in the data sheet
3:56
the transmitting power is set to max and
3:58
the mode is
3:59
fu3
4:04
[Music]
4:08
i am leaving everything to default as
4:10
this is the best
4:11
setup you can change them according to
4:14
your requirement
4:17
[Music]
4:19
now let's create the project in cube id
4:23
i am going to use both stm32f446 and
4:28
f103 for connecting
4:29
each hc-12 first i am creating the
4:34
project for f446
4:42
give some name and click finish
4:45
here is the cube mx
4:48
select external crystal for the clock
4:55
now you out one is where the device will
4:57
be connected
4:58
turn on the interrupt if you want to use
5:01
the ring buffer here
5:03
use the baud rate of 9600.
5:07
uart2 is for communicating with the
5:10
computer
5:11
same setup is required here too
5:20
now the clock setup i have eight
5:23
megahertz crystal
5:25
and i want the system to run at maximum
5:27
clock
5:31
click save to generate the project
5:38
here is our main file
5:46
here i am going to send some data to the
5:50
hc12
5:56
and i want the process to repeat every
5:58
two seconds
6:02
let's build it
6:09
we have no errors so let's go ahead and
6:12
flash this
6:13
as i am connecting two different mcus to
6:16
the same computer
6:18
i will face some issues with the sd link
6:21
to avoid that connect the first sd link
6:24
only
6:26
now in the debug configuration select
6:29
the sd link serial number
6:31
and tap on scan as there is only one sd
6:35
link connected
6:36
it will show up and now this particular
6:39
project will only use this particular sd
6:42
link the code is successfully flashed
6:50
this is it for the transmitter now i am
6:53
going to create another project for the
6:55
receiver
6:56
here i am using f103c8mcu
7:00
and the rest of the setup will remain
7:02
exactly the same
7:24
here in the main file create an array to
7:27
store the received data
7:36
now how you are receive will receive 22
7:39
bytes of data in the blocking mode
7:44
and then transmit that data to the
7:46
computer
7:53
let's build it and flash
7:58
now i am connecting the second sd link
8:02
check the serial number again and tap
8:04
scan
8:06
you can see both the sd links are being
8:08
detected
8:10
as i already know that this one is the
8:12
first one
8:13
so select the second and click apply
8:16
now this project will always use the
8:19
second sd link
8:20
regardless of how many are connected
8:23
so we have flashed both transmitter and
8:26
receiver
8:28
let's see the connection once this wire
8:31
right here
8:32
is connected between the rx pin of the
8:34
hc-12 and the uart 1tx
8:40
this one is connected between the tx of
8:42
the hc-12
8:44
and the uart 1 rx vcc is connected to 5
8:48
volts from the mcu
8:50
and note that the set pin is not
8:52
connected anywhere
8:54
we need to leave it like that for
8:56
communication
8:58
and while using the at commands ground
9:01
the set pin
9:03
the similar connection is in the
9:04
receiver end also
9:07
tx to rx and rx to tx
9:11
also i have connected the uart two pins
9:14
to the ftdi
9:15
to communicate with the computer
9:21
let's open the console and set the com
9:23
port for the receiver
9:38
as you can see the data is receiving
9:41
every two seconds
9:42
as we expected i have tested this for a
9:46
pretty good range
9:47
and it works as stated obviously i
9:51
couldn't test for two kilometers range
9:53
but i think it should work for a fairly
9:55
large range too
10:13
now let's move to the more complex part
10:15
and here we will do a two-way
10:16
communication between both the hc-12
10:19
modules
10:21
to do so i will use my uart ring buffer
10:24
library
10:25
i already have a video on it you can
10:28
check on the top right corner
10:30
let's include the library files
10:34
put the c file in the source directory
10:36
and header file in the include directory
10:40
do the same for the second project also
10:48
let's modify the f103 project first
10:57
include the uart ring file
11:01
change the header file according to your
11:03
controller
11:09
now we need to copy this and paste it in
11:11
the interrupt file
11:16
and change the default interrupt handler
11:19
to the modified one
11:34
now in the main file first define the
11:37
device you art
11:38
and pcu art
11:52
in the main function call the ring
11:54
buffer initialization function
11:59
and now if the data is available from pc
12:02
it will read it and send it to the
12:04
device
12:06
and if the data is available from device
12:09
it will read it
12:10
and send it to the computer that's all
12:13
now let's build it
12:20
we need to do the same steps in the
12:22
second project also
12:24
i will just fast forward this part
12:49
let's build it and flash to the mcu
13:09
[Music]
13:15
flash the first one also
13:22
so we are all set now
13:29
let's open another instance of this
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console
13:33
so one is at com port 3 and another at
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com port 4.
13:38
here the pink color is the one i am
13:40
sending and black color is the one
13:46
receiving
13:48
you can see the communication is working
13:50
both ways
13:52
and as this is using ring buffer we can
13:54
send random number of characters also
14:09
[Music]
14:14
do
14:28
do
14:42
do
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this is it for this video i hope you
14:57
understood it well
14:58
you can test different board rates and
15:01
powers
15:02
whatever suits the need you can download
15:05
the code from the link
15:06
in the description keep watching
15:10
be safe and have a nice day ahead
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