February 19, 2015

How Many Sensors Inside A Sports Smart Bracelet?

A couple of years ago, sports bracelets are no more than just a primitive pedometer, however, they are completely different now, some of them can even feedback heart rate or ultra-violet index. Without a doubt, the  recent adoption of intelligent sensors make bracelets even more sophisticated and smart then ever before, so, what are the key sensors?


Accelerometer is the common component in most sports monitoring equipment, OLED healthy Wrist Watch, for example, which has been used as step counter. Through direction and acceleration force, accelerometer itself can judge whether the device is moving by vertical position or horizontal position. Of course, not all of them works perfectly, triaxial sensor is the most accurate accelerometer.


GPS is an ordinary technology, it can position place or location accurately through acessing signals from 29 satellites that are orbiting the Earth. However, due to high battery consumption, it has not be popularized yet, only professional movement monitoring devices come with it, for recording geographic position and calculating running line and distance.

Optical heart rate monitor

Optical heart rate monitor is a premium function on high-end sports devices. Simply speaking, it illuminates your skin by LED light, when blood absorbs the light it measures the fluctuation caused by the pumping blood and will determine the actual heart rate, if attached correctly gives an accurate heart bpm reading.

Skin response sensor

It is a way more premium biosensor, which will be equipped on device which is able to monitor level of sweat. In general, human’s skin is the biggest conductor, when we sweat the skin response sensor can detect conversion rate of sweat, combined with accelerator sensors and the latest algorithms, it can measure exercising movement and calories precisely.

Ambient light and ultra-violet sensor

This type of top sensor is able to simulate human eyes’ sensitivity towards ambient light and judge specific time by light and shade, it can effectively save battery when you are not active and in the dark. The UV sensor can detect UV index and even remind you  to wear sunscreen to avoid sunburn.

Bilelectrical impedance sensor

Standard sports devices like the OLED Bluetooth Smart Bracelet fail to exert these features. A brand new UP3 from Jawbone is the only one we have that can achieve real blood flowing monitoring through muscle impedance, this gives a concrete heart rate, rate of respiration and reaction rate, it is more aggressive and advance but much more accurate .

Taken as a whole, sports intelligent bracelet we see today like OLED Smart Bracelet Wrist Watch is just the beginning of wearable tech, obviously, with a better and more accurate smart sensors, every single exercise walk or sleep will be more scientific and can be analysed, scary perhaps but it will allow us to optimize our behavior like never before. Surely it will also benefit monitoring in the medical field association and help recovery and prevention of disease.

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