Patent ID: 7534970

Claim:
A system for dispensing material comprising: a hopper configured to contain the material; a dispenser configured to receive material from the hopper and to dispense material; a frame pivotal about a pivot and configured to support at least the hopper; a first sensor configured to provide a first signal representative of the weight of at least a first portion of the material in the hopper; a second sensor coupled to the pivot and configured to provide a second signal representative of the weight being applied to the pivot, wherein the first sensor has a higher resolution and a faster response rate relative to the second sensor; a first filter to filter the first signal and to provide a first filtered signal, the first filter having a first time constant; a second filter to filter the second signal and to provide a second filtered signal, the second filter having a second time constant that is greater than the first time constant; a device configured to use the first filtered signal and the second filtered signal to determine the weight of the material in the hopper.