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13 sensors included in your wristband or smartwatch

Gyroscope, proximity sensor or compass are some of the 13 sensors that your bracelet or smartwatch contains. We tell you what they are and how useful they are.

Last updated on 08/11/2020 at 09:00

Your bracelet or smartwatch can tell you how many steps you’ve taken, guide you to a location, or measure your heart rate, however How it works?

Inside the device are a number of sensors that are key for the operation, as they are responsible for the interesting tools that you use every day in the Smartband or in the Smartwatch.

Immerse yourself in the operation of the device that you wear on your wrist by discovering it 13 sensors, including smart bracelets and watches.

You may already be familiar with some of them; B. GPS, but also that some others surprise you. Are you ready to know the sensors your bracelet or smartwatch contains? Let’s go there.

Your bracelet or smart watch contains 13 key sensors for operation.

13 sensors included in your wristband or smartwatch

From the popular Xiaomi Mi Band to the Amazfit GPS watch, wearables that are referred to as “intelligent” contain a number of sensors that enable their operation.

Some of these sensors are common to all deviceswhile others are more exclusive and they are only found in some wearables.

Let’s see what they are.

Blood oxygen meter or SpO2

Your wristband or smartwatch may have a blood oxygen meter. known as SpO2 and also included in some Samsung phones.

By emitting light pulses that go through the skin, this sensor can detect and analyze the color of the blood how it varies when the heart beats.

This is how your bracelet or smartwatch calculates the blood oxygen value, which must be between 95% and 100% to ensure that your body’s cells are receiving all of the oxygen they need.


The gyroscope is the sensor that measures the angular velocity of the device and thus its exact position.

Connect the gyroscope data to that of other sensors such as the accelerometer and bracelet maintains correct alignment When you move, you can’t just tell what kind of movement you’re doing (e.g. running instead of walking fast).


Take one point as a reference, the altimeter recognizes every change in height to who you are

This way, the smartwatch that you wear on your wrist knows if it is you Climbing stairs or mountain, and this is indicated by the number of calories.

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The altimeter detects how high you are, for example when you are climbing a slope.


The operation of the map application would not be possible without the compass, which is also helpful Share how to get to an exact point without getting lost.


One of the most important sensors on your wearable is the accelerometer, which measures it Acceleration force, direction of acceleration and the gravity and orientation of the device.

As mentioned earlier, the bracelet or watch, along with the information provided by the gyroscope, can tell what type of movement you are making.

Proximity sensor

The proximity sensor detects when There are objects near the device. So when you get close to your bracelet or smartwatch, they know you are going to use them and can turn on the home screen.

However, when you are not using the device, this proximity sensor will be used go to sleep to save battery.

Ambient light sensor

This is ensured by the ambient light sensor, which is also found in cell phones Record the light level in the area where it is located and send it to the device to perform certain actions.

If you have automatic brightness activatedThis sensor measures the external light to compensate for the brightness of the bracelet or screen.

Heart rate monitor

Most smartwatches and bracelets have a heart rate sensor that lets you know your data Beats per minute that your heart gives.

This information is Especially useful when you play sportsas it helps you know your heart rate is correct even when activity is high.

Bioimpedance sensor

The bioimpedance sensor measures your skin’s resistance to a small amount of electricity given off by the device’s battery electrodes.

If you analyze this resistance to electricity, the bracelet or the smartwatch, you can get data like that Water level, breathing rate, or sleep.

Geographic positioning system

Another of the most famous sensors on a smart device is GPS that one is used to Find the exact location of the portable and track its activity.

This GPS is key to receiving directions from the Maps app to get to a destination point.

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GPS helps you to find your way around with your wristband or smartwatch.


The magnetometer on your bracelet or smart watch measures the earth’s magnetic field and helps you to locate where north is.

Together with the GPS it helps you to know What is your location and where are you looking?.

Body temperature sensor

The body temperature sensor included in some smart bracelets monitors body temperature throughout the day.

It is a very useful sensor to know if you have a fever or when your menstrual cycle begins.

UV index meter

The last sensor on your bracelet or smartwatch that we want to talk to you about is the one measures the intensity of ultraviolet radiation come from the sun.

When you go outside, this sensor detects whether sunlight is dangerous or not and notify you via the wearable.

If you were interested in the operation of all these sensors, but do not yet have a device with these properties, you can take a look at our recommendations for best smartwatches and best smart bracelets.