Method for providing signal indicating spatial alignment of portable device e.g. mobile phone, involves detecting parameter influencing direction determination by using sensor, and determining reference direction based on detected parameter

摘要

The method involves determining direction from which gravitational acceleration acts on a portable device by using an acceleration sensor (140). The determined direction is compared with a determined reference direction by using a processing device (110), and a signal is provided by the processing device based on comparison results. A parameter i.e. temperature of the acceleration sensor, influencing the direction determination is detected by using a temperature sensor (150), where the reference direction is determined based on the detected parameter. An independent claim is also included for a device for providing a signal indicating spatial alignment of a portable device.