Patent ID: 7895759
Filing Date: 2011-03-01
Classification: G01C,H04M

Abstract:
1. An electronic device, comprising: a resistor comprising a first terminal, configured to be connected to a supply voltage, and a second terminal, configured to be connected to ground; the resistor defines a circle; the resistor has a reference point corresponding with a reference direction; a pointer pivotablely mounted about a centre of the circle, the pointer having a pointing terminal having contact with the resistor at a contacting point corresponding with a current direction, and the pointer is aligned with the magnetic field of the Earth; a measuring module configured to measure a voltage between the contacting point and the reference point; a calculating module configured to calculate an angle between the current direction and the reference direction according to the voltage between the contacting point and the reference point of the resistor; and a display module configured to display corresponding direction information according to the angle.