Datasheet

ManualsBrandsAdafruit ManualsAdafruitFeather nRF52 Bluefruit LE

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// Increase Blink rate to different from PrPh advertising mode

Bluefruit.setConnLedInterval(250);

// Callbacks for Central

Bluefruit.Central.setDisconnectCallback(disconnect_callback);

Bluefruit.Central.setConnectCallback(connect_callback);

/* Start Central Scanning

* - Enable auto scan if disconnected

* - Interval = 100 ms, window = 80 ms

* - Don't use active scan

* - Filter only accept HRM service

* - Start(timeout) with timeout = 0 will scan forever (until connected)

Bluefruit.Scanner.setRxCallback(scan_callback);

Bluefruit.Scanner.restartOnDisconnect(true);

Bluefruit.Scanner.setInterval(160, 80); // in unit of 0.625 ms

Bluefruit.Scanner.filterUuid(hrms.uuid);

Bluefruit.Scanner.useActiveScan(false);

Bluefruit.Scanner.start(0); // // 0 = Don't stop scanning after n seconds

}

void loop()

{

// do nothing

}

/**

* Callback invoked when scanner pick up an advertising data

* @param report Structural advertising data

void scan_callback(ble_gap_evt_adv_report_t* report)

{

// Connect to device with HRM service in advertising

Bluefruit.Central.connect(report);

}

/**

* Callback invoked when an connection is established

* @param conn_handle

void connect_callback(uint16_t conn_handle)

{

Serial.println("Connected");

Serial.print("Discovering HRM Service ... ");

// If HRM is not found, disconnect and return

if ( !hrms.discover(conn_handle) )

{

Serial.println("Found NONE");

// disconect since we couldn't find HRM service

Bluefruit.Central.disconnect(conn_handle);

return;

}

// Once HRM service is found, we continue to discover its characteristic

Serial.println("Found it");