BLE Heart Rate Collector Example

The BLE Heart Rate Collector application implements the Heart Rate Collector Role using the S120 or S130 SoftDevice.

GAP role implemented is the Central role. GATT role implemented is the Client role.

The Heart Rate Collector application implements the Collector role for the Heart Rate Profile. It scans peripheral devices, connects to the device advertising with Heart Rate Service UUID in its advertisement report, and discovers and configures the Heart Rate Service to start sending Notifications of Heart Rate Measurement. The Heart Rate Measurement received is logged on UART interface. This application will also discover and configure Battery Service at the peer.

The application includes the two services in the Heart Rate profile:

• Heart Rate Service Client
• Battery Service Client

Note

The application currently does not support connecting to multiple peripherals. Handling Connection Parameters Update and Pairing/Bonding are not implemented. Once connected, the application does not initiate disconnection but is capable of handling disconnection event initiated by peer or triggered unexpectedly.

Setup

The name of the example for PCA10028 is ble_app_hrs_c_s130_pca10028, and for PCA10031 it is ble_app_hrs_c_s130_pca10031. If you are not using the Keil Pack Installer, you can find the source code and project file of the example in the following folder: <InstallFolder>\examples\ble_central\ble_app_hrs_c

Button assignments: BSP BLE Button Assignments.

The application uses the following UART settings:

• Baud rate: 38.400
• 8 data bits
• 1 stop bit
• No parity
• HW flow control: RTS/CTS

Testing

Two boards are needed to perform this test:

• Collector Board: nRF51 Development board mounted with nRF51822 containing S120 or S130 SoftDevice.
• Sensor Board: nRF51 Development board mounted with nRF51822 chip Board containing S110 or S130 SoftDevice and the Heart Rate Application provided with the nRF51 SDK.

The application running on the Sensor Board is intended to serve as a peer (i.e. Heart Rate Sensor role) to this Heart Rate Collector application.

Test the BLE Heart Rate Collector Example application by performing the following steps:

1. Compile and program the BLE Heart Rate Collector Example application on the Collector Board. Ensure that the S120 or S130 SoftDevice is used for this application.
2. On the Collector board, observe that the BSP_INDICATE_ADVERTISING state is indicated. This shows that the application is scanning for Heart Rate Sensors.
3. Compile and program the Heart Rate Sensor application on the Sensor Board. Ensure the S110 or S130 SoftDevice is used for this application.
4. Observe that the Heart Rate Sensor is advertising.
5. Once the connection is established, the BSP_INDICATE_CONNECTED state is indicated on the Collector Board.
6. After a few seconds, observe Heart Rate measurements displayed on the UART.