Bluetooth Smart activity wearable monitors blood flow to track dynamic heart rate

The ID 107 from DO Technology comes in a wristband form factor and uses Nordic Semiconductor’s nRF51822 SoC to wirelessly monitor heart rate while also reporting a range of health data including steps taken, calories burned, and sleep.

Nordic Semiconductor today announces that China-based Shenzhen DO Intelligent Technology Co (DO Technology) has selected Nordic’s multiple award-winning nRF51822 Bluetooth® Smart System-on-Chip (SoC) for its new ID 107 24-hour real time dynamic heart rate monitor wearable.

The multifunction dynamic heart rate wristband is equipped with a photoelectric diode and a green LED on the underside of the bracelet. Increase blood flow leads to increased absorption of green light which is detected by the diode. Heart rate data is then calculated based on a proprietary algorithm. Users can then use the data to determine the level of effort maintained during exercise.

In addition to monitoring dynamic heart rate, the ID 107 also includes a real time clock and sleep monitor, as well as calculating steps taken, distance covered, and calories burned. A sedentary alert function allows the device to notify the user via vibration when they are due to exercise, based on a user’s preference settings. When wirelessly connected to a Bluetooth Smart Ready smartphone, the wristband also provides call, SMS, and alarm alert, smartphone camera remote control, and notifications for Facebook, Twitter, LinkedIn, and WhatsApp.

In the ID 107, the nRF51822 SoC allows captured data to be wirelessly communicated to an accompanying iOS 7.1 or Android 4.4 and above smartphone app where the user can see and interpret their results. In the absence of a receiver, data is stored for up to seven days on the device and downloaded to the mobile device at the next opportunity.

Manufactured from a water-resistant and durable thermoplastic silicone, the wristband weighs only 22 g and is powered by a 70 mAh Li-Poly battery, allowing the device to operate for between five and seven days in standby mode, thanks in part to the ultra low power consumption of the Nordic SoC. Recharge time is one hour.

Nordic’s nRF51822 is a powerful and flexible multiprotocol SoC ideally suited for Bluetooth Smart and 2.4GHz ultra low-power wireless applications. The nRF51822 is built around a 32-bit ARM® Cortex™ M0 CPU with 256kB/128kB flash and 32kB/16kB RAM. The embedded 2.4GHz transceiver is fully compliant with Bluetooth v4.2, the latest Bluetooth Smart specification.

“We have been working with Nordic for a long time and intend to continue the relationship,” says Wu Dajun, General Manager of DO Technology. “Nordic was among the first to develop ultra low power products and launch Bluetooth v4.0-compliant solutions equipped with the ARM Cortex-M0 CPU. The company provides dramatic advantages in terms of energy efficiency.”

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