US 10,198,710 B1 · System to determine a change in weight at a load cell

Abstract

Various sensors may be used to gather information about items at an inventory location, such as items on a shelf. Weight sensors may be used to gather weight data while capacitive sensors detect the presence of one or more objects such as the items themselves, a user reaching towards the shelf, and so forth. Data from a capacitive sensor may be used to determine that an activity is taking place at the shelf and to trigger processing of weight data from the weight sensor. A combination of a change in capacitance that exceeds a capacitance threshold and a change in weight that exceeds a weight threshold may be used to determine an event, such as a pick or place from the inventory location.

Claims20

Dependent claims

A method comprising:

determining a first weight value using a weight sensor, the first weight value indicative of a weight value before occurrence of an event;
determining a first capacitance value using a capacitive sensor;
determining a second capacitance value using the capacitive sensor;
determining a capacitance change value by subtracting the second capacitance value from the first capacitance value;
determining the occurrence of the event based on the capacitance change value exceeding a threshold value;
responsive to the capacitance change value exceeding the threshold value, determining a second weight value using the weight sensor, the second weight value indicative of a weight value after the occurrence of the event;
and
determining a weight change value by subtracting the first weight value from the second weight value.

5 more elements

Dependencies are inferred from the claim text.

System to determine a change in weight at a load cell

Life of this patent

System to determine a change in weight at a load cell

Life of this patent

Abstract

Claims20