Datasheet

ManualsBrandsAdafruit ManualsAdafruitFeather nRF52 Bluefruit LE

101

102

103

104

105

106

107

108

109

110

// b1:2 = Sensor contact status (0+1 = Not supported, 2 = Supported but contact not detected, 3 = Supported and detected)

// b0 = Value format (0 = UINT8, 1 = UINT16)

// B1 = UINT8 - 8-bit heart rate measurement value in BPM

// B2:3 = UINT16 - 16-bit heart rate measurement value in BPM

// B4:5 = UINT16 - Energy expended in joules

// B6:7 = UINT16 - RR Internal (1/1024 second resolution)

hrmc.setProperties(CHR_PROPS_NOTIFY);

hrmc.setPermission(SECMODE_OPEN, SECMODE_NO_ACCESS);

hrmc.setFixedLen(2);

hrmc.setCccdWriteCallback(cccd_callback); // Optionally capture CCCD updates

hrmc.begin();

uint8_t hrmdata[2] = { 0b00000110, 0x40 }; // Set the characteristic to use 8-bit values, with the sensor connected and detected

hrmc.notify(hrmdata, 2); // Use .notify instead of .write!

// Configure the Body Sensor Location characteristic

// See: https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.body_sensor_location.xml

// Permission = Read

// Min Len = 1

// Max Len = 1

// B0 = UINT8 - Body Sensor Location

// 0 = Other

// 1 = Chest

// 2 = Wrist

// 3 = Finger

// 4 = Hand

// 5 = Ear Lobe

// 6 = Foot

// 7:255 = Reserved

bslc.setProperties(CHR_PROPS_READ);

bslc.setPermission(SECMODE_OPEN, SECMODE_NO_ACCESS);

bslc.setFixedLen(1);

bslc.begin();

bslc.write8(2); // Set the characteristic to 'Wrist' (2)

}

void cccd_callback(BLECharacteristic& chr, uint16_t cccd_value)

{

// Display the raw request packet

Serial.print("CCCD Updated: ");

//Serial.printBuffer(request->data, request->len);

Serial.print(cccd_value);

Serial.println("");

// Check the characteristic this CCCD update is associated with in case

// this handler is used for multiple CCCD records.

if (chr.uuid == hrmc.uuid) {

if (chr.notifyEnabled()) {

Serial.println("Heart Rate Measurement 'Notify' enabled");

} else {

Serial.println("Heart Rate Measurement 'Notify' disabled");

}