Patent ID: 6988319
Filing Date: 2006-01-24
Classification: G01C

Abstract:
1. A level-measuring circuit, set in a device, suitable to measure the tilt angle between the device and a horizontal, the level-measuring circuit comprising: a tilt sensor comprising an output pin, at least a first input pin set beside one side of the output pin, and an electrically conductive electrolyte between the first input pin and the output pin; a signal-generating module generating a set of level-measuring signals comprising a first voltage and a second voltage, wherein the set of level-measuring signals are input to the first input pin, so the tilt sensor outputs a set of output signals from the output pin, and the set of output signals comprise a third voltage and a fourth voltage; an amplifier receiving and amplifying the set of output signals and then sending out the set of amplified output signals; and a micro-controller unit receiving the set of amplified output signals and sampling and averaging the third voltage and the fourth voltage of the set of amplified output signals by a sampling frequency to get a fifth voltage and a sixth voltage, and then differentiating the fifth voltage and the sixth voltage to generate a level-estimating-result signal corresponding to the tilt angle.