Device for notifying user about missing items from a bag

A system comprising a device coupled to a bag containing a set of items, further comprising:

• a load cell in the bag;
• a force-sensitive resistor coupled to a strap of the bag;
• an indicator light;
• a processor;
• and
• a memory in communication with the processor, the memory comprising executable instructions that, when executed by, the processor, cause the data processing system to perform functions of:
• importing calendar data that includes a sequence of class start times and stop times associated with a class schedule;
• automatically measuring with the load cell the first weight of a set of items in a bag responsive to a first time in the sequence of the class start times;
• storing in the memory the first weight as a calibrated weight;
• following a second time in the sequence of the class stop times and after determining with the force-sensitive resistor that the bag is being worn by a user, automatically measuring with the load cell a second weight of the set of items;
• storing in the memory the second weight as a measured weight;
• determining whether the measured weight is less than the calibrated weight;
• and
• based on the determination that the measured weight is less than the calibrated weight, notifying the user that at least one of the set of items is missing.

A system comprising a device coupled to a bag containing a set of items and a mobile device running bag application software, the mobile device coupled to the device via a wireless interface, further comprising:

• a load cell in the bag;
• a force-sensitive resistor coupled to a strap of the bag;
• a processor;
• and
• a memory of the mobile device in communication with the processor, the memory comprising executable instructions that, when executed by, the processor, cause the system to perform functions of:
• using the bag application software, importing calendar data that includes a sequence of class start times and stop times associated with a class schedule;
• setting a first time and a second time using the bag application software according to the sequence of the class start times and stop times associated with a class schedule;
• automatically measuring with the load cell a first weight of a set of items in a bag responsive to the first time;
• storing in the memory the first weight as a calibrated weight;
• following the second time, the second time following the first time and after determining with the force-sensitive resistor that the bag is being worn by the user, measuring with the load cell a second weight of the set of items;
• storing in the memory the second weight as a measured weight;
• determining whether the measured weight is less than the calibrated weight;
• based on the determination that the measured weight is less than the calibrated weight, notifying the user that at least one of the set of items is missing;
• and
• using the bag application software, displaying an alert status entry in response to the notification of the user along with the class schedule on the mobile device.