STM32WB Bluetooth^® LE – Heart Rate Sensor Project

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1. Heart Rate Profile Presentation

Heart Rate Profile (HRP) ^[1] is a Generic Attribute Profile (GATT) based low energy profile defined by the Bluetooth^® Special Interest Group^[2]
The HRP, widely used in fitness applications, defines the communication between a GATT-server of a Heart Rate Sensor device, such as a wrist band, and a GATT-client Collector device, such as a smartphone or tablet.
Heart Rate Sensor is the device that measures heart rate data and other information, it can be defined as a GAP peripheral and GATT server implemented with the Heart Rate Service ^[3]

This wiki page is the description of the Heart Rate Sensor project provided within the STM32CubeWB MCU Package^[4]

Bluetooth^® LE Heart Rate profile overview

2. Heart Rate Sensor Example

2.1. Requirements

2.1.1. Software and System requirements

Software required are the following:
minimum IDEs version:

IAR Embedded Workbench for ARM (EWARM) toolchain V8.20.2
RealView Microcontroller Development Kit (MDK-ARM) toolchain V5.31
STM32CubeIDE toolchain V1.7.0 ^[5].

Programmer:

STM32CubeProgrammer^[6] : To flash the board with an already generated binary

2.1.2. Hardware requirements

A Nucleo board^[7], a STM32WB USB dongle^[7], or a STM32WB Discovery Kit^[8] is necessary to install the application.

Hardware platforms illustration

Plus a smartphone with ST BLE Sensor application (for Android^[9], or iOS^[10]).

2.1.3. Project Directory

The "BLE_HeartRate" application is available by downloading STM32CubeWB MCU Package^[11].

Heart Rate project directory

2.2. Project Description

2.2.1. Structure

2.2.2. Application Initialization

2.2.3. GAP & GATT Initialization & Interaction

Interaction between Middleware and User Application is described in the following illustration. lionel to explain...

Heart Rate project architecture

2.3. Build and Install

Follow steps described in Bluetooth^® LE Build and Install Application page, applying it for BLE_HeartRate project.

2.4. Handle

Once the BLE Heart Rate application installed on the STM32WB platform, launch the ST BLE Sensor smartphone application.

Click on Connect one Device interface:

Heart Rate application interface 1

Your device should be visible from this interface, connect to it:

Heart Rate application interface 2

Now bpm measurement is displayed in real time.

Heart Rate application interface 3

With Discovery Kit Platform, the Heart Rate is also visible from the board LCD screen, and Heart pulse is illustrated:

Heart Rate on DK illustration

3. References

[1] Heart Rate profile specification

[2] Bluetooth^® SIG

[3] Heart Rate service specification

[4] STM32CubeWB MCU Package

[Stm32CubeIDE-5] STM32CubeIDE

[Stm32CubeProg-6] STM32CubeProgrammer Software

[Nucleo_package-7] 7.0 ^7.1 P-NUCLEO-WB55 package

[DK-8] STM32WB5MM-DK board

[BLE_Sensor_Android-9] ST BLE Sensor Android application

[BLE_Sensor_iOS-10] ST BLE Sensor iOSapplication

[STM32CubeWB-Package-11] STM32CubeWB MCU Package

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STM32WB Bluetooth® LE – Heart Rate Sensor Project