Abstract: Items may be stored on a fixture of a facility using one or more accessories, such as trays or bins. Weighing modules that include one or more load cells may be mounted to a crossbar of the fixture. The accessories of the fixture may then be mounted to the crossbar via the weighing modules. The load cells within each weighing module can collect weight data associated with items stowed in the accessories that are coupled to the weighing module. When a weight change is detected at the fixture, a particular load cell is identified as the source of the weight change. Once a load cell is identified, the accessory coupled to the load cell is identified, as well as the types of items stowed therein. Interaction data can then be determined to indicate a type of item that was added to or removed from the accessory of the fixture.

Abstract: Interposer assemblies may be inserted between a traditional shelf and traditional supports for the shelf. Each of the interposer assemblies may be configured to generate signals corresponding to changes in loading on the traditional shelf, and information regarding the changes may be determined to identify items placed onto or removed from the traditional shelf, and locations at which the items were placed or from which the items were removed. The interposer assemblies may include one or more load cells, such as strain-gage load cells, and analog signals generated by the load cells may be processed to determine a mass of an item placed on the shelf or removed therefrom. The item, and a location corresponding to the item, may be determined based on the mass and according to standard equilibrium procedures.

Abstract: Shelves or other fixtures may be used to support items at a facility. Weighing modules including load cells may be used at the fixtures to acquire weight data indicative of changes to the fixture as items are added or removed from the fixture. Weighing modules may be modular and repositionable with respect to a crossbar or other supporting member that provides electrical power and data connectivity. This allows for the fixtures to be easily reconfigured to accommodate items of different sizes.

Abstract: Interposer assemblies may be inserted between a traditional shelf and traditional supports for the shelf. Each of the interposer assemblies may be configured to generate signals corresponding to changes in loading on the traditional shelf, and information regarding the changes may be determined to identify items placed onto or removed from the traditional shelf, and locations at which the items were placed or from which the items were removed. The interposer assemblies may include one or more load cells, such as strain-gage load cells, and analog signals generated by the load cells may be processed to determine a mass of an item placed on the shelf or removed therefrom. The item, and a location corresponding to the item, may be determined based on the mass and according to standard equilibrium procedures.

Abstract: Interposer assemblies may be inserted between a traditional shelf and traditional supports for the shelf. Each of the interposer assemblies may be configured to generate signals corresponding to changes in loading on the traditional shelf, and information regarding the changes may be determined to identify items placed onto or removed from the traditional shelf, and locations at which the items were placed or from which the items were removed. The interposer assemblies may include one or more load cells, such as strain-gage load cells, and analog signals generated by the load cells may be processed to determine a mass of an item placed on the shelf or removed therefrom. The item, and a location corresponding to the item, may be determined based on the mass and according to standard equilibrium procedures.