An electronic device for monitoring the fullness of a trash receptacle is disclosed. The trash receptacle is associated with a compactor that has a compression member for compacting trash within the receptacle. The compression member is powered by an electric motor. The current drawn by the electric...http://www.google.com.hk/patents/US5558013?utm_source=gb-gplus-share專利 US5558013 - Device and method for electronically measuring the fullness of a trash receptacle
