A system of detecting loading and unloading of mobile containers such as graincarts utilizes two low pass filters to determine whether the contents of thecontainer arechanging by subtracting one filter signal from the other, and using the signof thedifference. Weighing performance is improved by utilizing accelerometers tocompensatefor measurement dynamics and non-level orientation. Failure and degradation ofweightsensors is detected by testing sensor half bridges. Loading and unloadingweights can betied to specific vehicles by utilizing RF beacons.
