The Cardiosport platform provides raw accelerometer data so developers are able to design apps around TP5’s functionality. For example, one Cardiosport customer uses the 3-axis accelerometer synched with the r-r intervals to monitor cardiovascular efficiency when the end user is running. Another customer integrates TP5 in clothing, through soft fabric ECG electrodes rather than a chest strap, to detect heart rate and r-r intervals in relation to the stillness and composure of the end user during yoga movements.
Programmable LED lights can be synched to the user’s heartbeat to change colour with HR zone, and display battery level and accelerometer movements. The LEDs offer up to nine different color configurations, while the functions can be changed for different TP5-based wearables via over-the-air device firmware updates (OTA-DFU).
Nordic’s nRF52832 multiprotocol SoC combines a 64MHz, 32-bit Arm® Cortex® M4F processor with the 2.4GHz multiprotocol radio featuring -96dB RX sensitivity, and generous 512kB Flash memory and 64kB RAM supporting complex applications and OTA-DFUs for Cardiosport customers.
The SoC is supplied with the S332 SoftDevice, a combination Bluetooth 5-certifed/ANT RF software protocol stack for building advanced Bluetooth LE and ANT applications. The S332 SoftDevice supports Central, Peripheral, Broadcaster and Observer Bluetooth LE roles, supports up to twenty connections, and enables concurrent role operation.
“We believe it is essential for heart rate monitor devices to incorporate support for Bluetooth LE, ANT+ and proprietary 2.4GHz protocols, which is one of the main reasons we selected the Nordic SoC,” says James MacGregor, Marketing and Business Development Manager at Cardiosport.
“Power consumption was also a very important factor when considering our choice of chip. The nRF52832 allows the TP5 Heart Rate Monitor to match the power consumption and battery life of Cardiosport’s previous TP3 Heart Rate Monitor, even though we have added LED lights, accelerometer/internal memory, and the ability to concurrently support Bluetooth LE & ANT+.
“Nordic’s nRF52 Series SoCs come with a lot of useful technical information, and the application engineers are always quick to respond to any queries,” adds MacGregor.