Arduino bluetooth serial example

Note that, at the time of writing, the code of the mentioned library had just been merged to the Arduino Master branch, so you may need to get the latest changes from there. You can check here how to update your Arduino core version.

The tutorial shown here was based on the Arduino core BluetoothSerial library example, which can be see seen here. If you want to know a little bit more of the lower level Bluetooth functionalities, you can check the Related Posts section at the end of this tutorial, which includes some tutorials on how to use the IDF Bluetooth API on the Arduino core.

The code We start our code by including the BluetoothSerial. We will use this object to initialize the Bluetooth stacks controller and host and to established the serial communication over Bluetooth. This object works very similarly to the Serial extern variable we use to establish a regular wired serial communication. BluetoothSerial SerialBT; Moving on to the Arduino setup function, we start by opening a wired serial connection, so we can print the content we receive via Bluetooth.

This method will handle all the lower level initialization, so we can use the Bluetooth functionality without having to worry about what happens under the hood. As input, the begin method receives the name we want to assign to the ESP32, which will be shown to other Bluetooth enabled devices when performing a scan.

As output, the method returns a Boolean value indicating if the initialization was correctly performed.

Thus, to confirm everything executed fine, we will do an error check wrapping the begin method call. There are a number of bluetooth terminal application for android. I chose Serial Bluetooth Terminal. Connect the app to the HC module. Now we will write a sketch that accepts a character from the serial port where the HC is connected and change the state of the LED based on that character.

We will have a different wiring diagram for this one:. I went away from the hardware tx and rx pin so that we can still use the serial monitor for debugging. This means the HC will be using the SoftwareSerial library. We print a message to the serial monitor for every event that occurs for easier debugging.

Open the Bluetooth Serial Monitor app. Select allow when asked about turning on Bluetooth. On the menu bar, select Bluetooth Devices:. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

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How can I fix this problem? Have you tried using different pins for the softwareserial? Not all pins are supported depending on which board you are using: arduino. Thank you for your suggestion, I am using an Arduino Uno so there shouldn't be any problem but I tried it anyway, same result. Have you tried different baudrates? Connecting through BLE to your Arduino and read the data every few seconds. There are various ways of advertising data changes whilst you are connected. I checked out the Nordic link - that is basically what I need, a data logger over serial.

I will get a test link working and then pile in the rest of the code. I just need to check there are no gotchas between the two Nano versions. That is certainly the case.

See my notes on the Problems of BLE. This topic was automatically closed days after the last reply.