This example shows how to communicate with a HC-06 Bluetooth module using Serial Port Profile.
Windows 10 or macOS machine with built-in or external Bluetooth 2.0 compatible adapter
HC-06 Bluetooth module
5 V source, such as an FTDI converter or Arduino board
A few wires
This example uses a HC-06 Bluetooth transceiver module configured as a loopback device. On the HC-06 module:
Connect the VCC pin to the 5 V source.
Connect the GND pin to the ground.
Connect the TXD pin to the RXD pin.
A blinking LED on the HC-06 module indicates that the device is powered. Next, pair the device on the host computer to allow connection in MATLAB. The default PIN code is 1234 unless configured otherwise.
Identify the Bluetooth device address or name and SPP channel number by calling the
bluetoothlist function. Make sure the device status is
"Ready to connect", indicating that it is powered on and paired. If you already know the device information, you can skip this step.
Run blelist to search for nearby Bluetooth Low Energy peripheral devices.
ans=4×4 table Name Address Channel Status ___________ ______________ _______ __________________ "HanaBTDev" "CC78AB79656F" Unknown "Unknown" "EUCLID" "0016530CE4AC" Unknown "Unknown" "HC-06" "98D331FB3B77" 1 "Ready to connect" "DMTDevice" "B0B448F47A4C" 1 "Requires pairing"
Use the device address or name and SPP channel number to connect to the device by calling
bluetooth. Specify the device name if it is unique or specify the device address.
hc06 = bluetooth("HC-06", 1)
hc06 = bluetooth with properties: Name: "HC-06" Address: "98D331FB3B77" Channel: 1 NumBytesAvailable: 0 NumBytesWritten: 0 Show all properties
After you connect the HC-06 to MATLAB, write byte data or string data to the device by calling
write(hc06, 1:10); write(hc06, "helloworld");
Since the device is configured as a loopback, the data received on the device is immediately returned to MATLAB. Read the data by calling
ans = 1×10 1 2 3 4 5 6 7 8 9 10
read(hc06, 10, "string")
ans = "helloworld"
For information on sending and receiving terminated string data, see
You can use a callback function to read data as it is written to the Bluetooth device. Call
configureCallback to read and collect data each time five bytes are sent by the device and received in MATLAB.
function collectData(src, evt) % Read received data and store it in the UserData property on the bluetooth object src.UserData = [src.UserData; read(src,src.BytesAvailableFcnCount)]; end
configureCallback(hc06, "byte", 5, @collectData);
Write data to the device. The data is immediately sent back to MATLAB, triggering the callback function to read and display the data.
write(hc06, 1:20); % Wait for all callbacks to be processed pause(1); disp(hc06.UserData);
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Clear the device object when you are finished working with it.