March 2026
Intermediate to advanced
400 pages
15h 45m
English
When introduced in 2007, smartphones differed from their predecessors because after just a few years on the market, they bristled with features and functions, such as an array of sensors including an accelerometer, a gyroscope, a compass, a proximity sensor, a thermometer, GPS for accurate location, distance, and speed traveled, as well as a flashlight, camera, a microphone, barcode/QR code readers, and a video/voice recorder. Indeed, later models added even more functions, such as a pedometer, a barometer, a heart-rate sensor, as well as fingerprint and face recognition functions (and in one manufacturer ’s phone, a Geiger counter). This vast array of inbuilt functionality meant that developers had a treasure ...
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