Monitoring system for dispenser

A dispenser for dispensing a sheet material, comprising:

• a roll support for supporting a supply of the sheet material;
• a feed roller arranged along a feed path of the sheet material downstream from the supply of sheet material, the feed roller engaging and pulling the sheet material from the supply of sheet material for feeding along a dispensing path upon the rotation of the feed roller;
• a controller in communication with the feed roller and including programming for monitoring rotation of the feed roller during a dispensing cycle for feeding a selected length of the sheet material from the supply of sheet material;
• and
• a material supply monitoring system in communication with the controller operable to detect a number of rotations or an angle of rotation of the supply sheet material during at least a series of dispensing cycles, and based upon changes in such signals, a remaining diameter of the supply of sheet material is substantially dynamically determined after at least each of the series of dispensing cycles, the material supply monitoring system including:
• at least one magnet configured to be operatively connected to the supply of sheet material so as to be rotatable therewith;
• and
• at least one sensor mounted on the roll support and located adjacent the supply of sheet material in a position to detect variations or changes in a magnetic field generated as the at least one magnet passes the at least one sensor when the supply of sheet material is rotated.