Accelerometer

Apple takes user submitted data for age, height, gender and weight to help it calculate the different data points it provides for workouts and activities, but there is also a way to calibrate Apple Watch to improve the accuracy of the data.

By initiating the calibration process, you can get more accurate readings for calorie, distance, Move, and Exercise estimations in the Watch’s Activity app, and also improved calculations in the Workout app.

By following the steps below, you’ll start calibrating the device’s accelerometer and improve Apple Watch’s accuracy by allowing it to learn your personal stride patterns at various speeds:
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A student at Goldsmiths, University of London has apparently been able to create an invisible, virtual keyboard for iPhones by using the device’s built-in accelerometer to pick up vibrations caused by tapping or typing on a surrounding surface area. As you can see from the video demonstration above, the “Virbrative” software developed by Florian Kraeutli (on a jailbroken iPhone 4) allows him to measure the strength and frequency of vibrations and then map them to iOS’ onscreen keyboard. The Telegraph spoke with Kraeutli about the software developed for a project on user interfaces:

“The signals I’m collecting are very weak,” said Florian Kraeutli, a computing student at Goldsmiths, who created the system as part of his work on user interfaces.“At the moment it’s more of a proof of concept but if you made the accelerometer more sensitive you could improve the accuracy quite easily.”

In the video above, we see the developer use a keyboard drawn on a piece of paper to train the system before tapping directly on the table underneath. Kraeutli noted users would ideally “train each key, but you can do just a couple.” According The Telegraph, the system “determines the intended key correctly about 80 per cent of the time, so the data is also fed into an auto correct dictionary to ensure the words are spelled correctly.” Kraeutli suggested that access to more powerful accelerometers could allow him to increase the accuracy of the system:
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