What makes smartwatches stuff with all that magical features? – Smartwatch Blog


Smartwatches have intimately involved in our lives, with all the stunning features they provide us, they are not only our fitness trackers, health guides, etc along with a lot of other things. So how do smartwatches achieve these functionalities? The answer would be all the delicate sensors compacted in the small cases on our wrists.

DT1 from DTNO.1

What kind of sensors does a smartwatch commonly have? Let’s take a look.

1. Ambient light sensor

Most fitness trackers and smartwatches come with ambient light sensors. Its main job is to adjust the brightness of the display based on the surrounding light. This also helps save power.

2. Three-axis accelerometer

Three-axis accelerometers are the most common sensors in wearable devices. The sensor can track forward and backward movement, sense gravity, and determine the body’s orientation, position, and rate of change in velocity.

3. Altimeter

The altimeter can only detect changes in altitude. It helps to detect whether you are climbing stairs or going downhill, thus helping to measure calorie count.

4. Optical heart rate sensor

Almost every fitness tracker comes with an optical heart rate sensor, which uses light to check the blood flow rate on the wrist to calculate the number of heartbeats per minute. When the heartbeats, the blood flows rapidly within the arteries, so less light is reflected on the sensor, which is detected as a heartbeat.

DT2 from DTNO.1

5. The SpO2 monitor

SpO2 monitors check the color of the blood to see how much oxygen is in it. “Deoxygenated blood returning to the lungs through veins is slightly more red than fully oxygenated blood in arteries,” explains DTNO.1. The sensor measures the relative reflectance of red and infrared light in the blood through the wrist and observes how it changes with the heartbeat. The SpO2 value was estimated based on the change.

6. Bio-impedance sensor

Bio-impedance sensors measure the skin’s resistance to small amounts of electricity. Battery charger electrodes in fitness trackers provide very small amounts of current to measure sleep, heart rate, breathing rate, water level, and more.

7. Proximity sensor

Proximity sensors just let the device know that you are near the device and want to use it. If you’re not wearing a fitness tracker, this sensor can put the device to sleep and save battery power when not in use. It is mainly used to turn the display on or off.

8. Compass

The compass helps the Map app run on the smartwatch and gives the device a sense of direction.

DT3 from DTNO.1

9. ECG sensor

ECG sensors are a new addition to wearables. This sensor’s job is to detect the tiny electrical pulses your heart sends out with each beat. The sensor detects the minute’s heart signal through electrodes on your smartwatches.

10. Global Positioning System

GPS only helps you detect your running volume, the location of your smartwatch and track your activity. It also helps guide the Map application.

11. Gyroscope

Technically, gyroscopes measure the angular velocity used to detect movements and accurately track them on the go. For example, data from a gyroscope and other sensors can determine whether you’re actually running or jogging somewhere. In addition, it can eliminate motion caused by vigorous wrist shaking and mistake it for a vigorous run.

12. Gesture sensor

Gesture sensors can instruct the smartwatch to perform certain functionalities when the hand is moved in a certain way. For example, a call will be disconnected if the wrist is flicked twice, or the stopwatch will start timing when the hand circle is turned.

DT93 from DTNO.1

13. UV sensor

Some smartwatches also provide information on whether outdoor sunlight is harmful. This is detected by UV sensors, which detect UV light when you step outside.

14. Magnetometer

The magnetometer works with GPS and compass to determine the exact coordinates of your location.

15. Galvanic skin response sensor

Galvanic skin response or EDA sensors are a new addition to wearables. It measures stress along with a heart rate tracker, ECG, and skin temperature sensor. It detects subtle electrical changes in your skin’s sweat and helps you relieve stress.

16. Skin temperature sensor

The skin temperature sensor detects slight changes in temperature to know if you are getting sick like a fever or detect the start of a menstrual period.



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