Review Article
A Review of Wrist-Worn Wearable: Sensors, Models, and Challenges
Table 4
Sensors used for activity recognition.
| Sensor types | Activity studies |
| Accelerometer | [2, 3] | 3-Axis accelerometer | [64ā67] | Accelerometer and geomagnetic | [68] | Inertial measurement units: (i) Accelerometers (ii) Gyroscopes (iii) Magnetometers (sometimes) | [69] | Electric potential sensor | [70] | Multimodal sensors: (i) Activity (accelerometer and gyroscope) (ii) Ambient environment (temperature, atmospheric pressure, and humidity) (iii) Location context (Bluetooth message reception) | [63, 71] | Piezoresistive sensors and triaxial accelerometers | [72] | Ambient light | [16] | Heart rate (HR) | [67] |
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