Abstract: A scenting nebulizer is described that capacitively measures the level of scenting oil in a bottle in the nebulizer without ever contacting the oil in the bottle. In addition, such capacitively measured oil levels are measured at multiple vertical levels of the bottle of scenting oil. In actual operation the capacitively measured oil level readings are very frequently measured then averaged, and the averaged figures are stored. The stored, averaged figures are interpolated against previously stored, capacitance readings made when the scenting oil bottle is full and when there is no bottle. In this manner the level of the oil is accurately determined. A plurality of processor controlled scenting nebulizers are connected to a central computer and their individual oil levels and other operational information are forwarded to the central computer where appropriate maintenance for the individual nebulizers is scheduled.

Abstract: An emergency response system that is used by schools to alert students, faculty, and staff on the school campus of critical situations. The system utilizes ID cards that are issued to the students, faculty, and staff at the beginning of each new school year, and issued to visitors as needed. The ID cards each have a miniature receiver, control circuitry, antenna and battery embedded into them along with a flat speaker and an LED light. If an emergency on the grounds of the school is imminent or ongoing, a master transmitter box is triggered by an administrator. The triggering of the transmitter sends coded RF signals out to ID cards and repeaters that are strategically placed through the school property. Signals received by the receivers embedded into the ID cards and decoded by the control circuitry trigger the speaker and LED in the ID cards to alert persons carrying the ID cards.