Problems with the iPhone 5s's motion sensor, which have led to its compass, spirit level and gaming controls being imbalanced, could be down to the device’s accelerometer.
The issues, revealed a few weeks ago by Gizmodo, are being blamed on an updated part in the newly released phone. The iPhone 5s uses a Bosch Sensortech accelerometer, while older iPhones used a STMicroelectronics version.
That, says the CEO of developer RealityCap, has made a massive difference, as the new accelerometer is balanced differently. Apple apparently failed to calibrate the Bosch sensor properly before releasing the iPhone 5s, hence these problems coming up in the weeks after release.
RealityCap is working on code to help developers get over the bias that's causing the iPhone 5s’s motion sensing to work out of sync. However, it seems Apple is unlikely to do anything itself to fix the problem.
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