Smart bracelets and fitness trackers are by far the most common items of wearable tech products the world over. They are also great way to monitor your health through the day and lots of people are adorning them. If fitness is your new years resolution, you might think about getting one of these.
It is a marvel how effective they can be at doing what they say they do. When paired with a smartphone app, they are able to achieve some pretty accurate readings. However on their own, they are pretty powerful. Stocked with of lots of software the hardware components of these devices do some heavy lifting of their own and that is what I will be breaking down in a bid to understand just how fitness trackers work.
Accelerometers
This is to me the most key components of these devices because it is responsible for tracking movement. An accelerometer is a device that in simple terms detects and measures movement. This movement could be from the motion of your wrist or a fall due to gravity. They have are used in lots of other devices such as phones where they are responsible for that auto rotation feature. In a fitness tracker, they detect when you move your arm and body so as to start recording your activity or workout.
GPS tracker
Fitness trackers are common with people that like to workout. It could be in the gym or especially running outdoors. For the device to be able to know how long you have been running outside and also to provide a map at the end of the run, it needs GPS to pinpoint your start and stop locations as well as all those places in between. If you have a fitness tracking app on your phone, it also uses the GPS tracking system of the phone to create a map of the places you have been busy.
Thermometers
Fitness trackers are categorized as health monitoring devices and the most common indicator of good or bad health is a temperature change. High or low temperature is a sign of bad health with that perfect figure (37 degrees Celsius ) is that perfect health sweet spot, but we all know this and should also know that it is important to fit a fitness tracker with a thermometer for exactly that job. Otherwise it wouldn’t be so useful, do you agree?
Optical heart rate monitors
Have you ever wondered how that little device is able to tell your heart rate, yet doctors need to use an EKG or sit you down, put that strap to your arm and pump air till it gets too tight and then measure your blood pressure? The answer is an optical heart rate monitor. A light shines through your skin to illuminate your blood vessels. since blood is good a absorbing light, the fluctuating pulsations of the light picked up by the optical sensors is translated into the rhythm of the heart and measures your heart rate.
Ambient light sensors
If you put your phone’s light settings at automatic, you notice that when you are in a dark place, the screen gets brighter and dims when there is more light. This is made possible by an ambient light sensor which measures the amount of light the device is receiving. Fitness trackers use this same device together with, clocks and software to determine the time of day and the difference between night and day.
There are more components that make fitness trackers operate the way they do depending on how advanced the device is and how
Elit 
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