Operation method to operate tilt sensor

An operation method to operate a tilt sensor with power-saving mechanism, wherein the operation method comprises the steps of:

• providing an accommodating space in the tilt sensor such that a blocking object is displaceable in the accommodating space on a baseboard of the tilt sensor according to the gravity;
• performing a working mode such that a light-emitting element emits light according to a first current and at least two first light sensors sense a light amount according to the relative position of the light-emitting element and the blocking object to determine a tilt angle of the tilt sensor;
• determining whether the light amount has a change or whether a light amount variation sensed by a second light sensor according to the relative position of the light-emitting element and the blocking object is smaller than a threshold value;
• when the light amount doesn't change or when a light amount variation is smaller than the threshold value within a predetermined time period, a power-saving mode is performed such that the light-emitting element emits light according to a second current smaller than the first current;
• determining whether the light amount variation sensed by the second light sensor according to the relative position of the light-emitting element and the blocking object is larger than a specific value during the power-saving mode;
• and
• when the light amount variation is larger than the specific value, the working mode is performed.