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iwatchjr - Introduction to Smartphone Sensors

Most smartwatches and fitness trackers are crammed full of sensors said by iwatchjr. Take the Apple Watch Series 4 as an example, which has a barometric an altimeter to measure altitude, an electrical heart sensor to take ECG readings, an accelerometer to keep tabs on movement, an optical heart sensor to measure your heart rate, a gyroscope to track movement and rotation, and an ambient light sensor to control the brightness of your screen.

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