An electronic device, having a primary function different from detecting a fire, is configured for detecting a fire. The device includes processor circuitry, and a temperature sensor configured to generate temperature data, wherein the processor circuitry is configured to determine whether a first generated temperature data meets a first temperature criteria at a first time, and determine whether a second generated temperature data meets a second temperature criteria at a second time after the first time.

A device for monitoring a physiological variable determines a starting value for a self-adjusting alarm limit based on an abnormal state of the physiological variable. The device determines a new value for the self-adjusting alarm limit from physiological data values received during a time window. When the new value for the self-adjusting alarm limit moves in a targeted direction, the device resets the self-adjusting alarm limit at the new value.

A device for monitoring a physiological variable determines a starting value for a self-adjusting alarm limit based on an abnormal state of the physiological variable. The device determines a new value for the self-adjusting alarm limit from physiological data values received during a time window. When the new value for the self-adjusting alarm limit moves in a targeted direction, the device resets the self-adjusting alarm limit at the new value.

A fire system 10 for a building is provided, the fire system 10 including a fire panel 12 for monitoring the building and activating an alarm; and a plurality of remote units 14, 16, 18 electrically connected to the fire panel 12 in a circuit 20 having a loop configuration. At least some of the plurality of remote units 14, 16, 18 including an indicating device 14, 18 for modulating a current in the circuit 20. The plurality of remote units 14, 16, 18 are in communication with the fire panel 12 in a master-slave relationship. The fire panel 12 includes a calibration module 22 for polling each indicating device 14, 18 to obtain a current response value and for storing said current response values, the current response value of an indicating device 14, 18 being based on the amplitude of the current when modulated by that indicating device.

There is provided a smoke detector including a light source, a reflective surface, a light sensor and a processor. The light sensor receives reflected light when the light source emits light toward the reflective surface, and generates a reference detection signal when there is no smoke. The processor receives the detection signal from the light sensor, and automatically selects a set of predetermined condition thresholds according to a profile of the detection signal to be compared with the detection signal thereby determining whether to generate an alarm according to the comparison result.

A method of operating a sensing component for sensing a magnetic field to determine a state of an access point having a first component and a second component that are separable from each other to create an opening and wherein a magnet is mounted on one of the first or second components of the access point, wherein the method comprises: operating the sensing component to sense a magnetic field in multiple dimensions to produce a sample representation of the sensed magnetic field, wherein the sample representation is a multi-dimensional representation and determining whether the sample representation is in a pre-determined region about a reference representation that is representative of a state of an access point to determine that the sensed magnetic field corresponds to said state of the access point, wherein the pre-determined region comprises a circular cross-section.

A method of operating a sensing component for sensing a magnetic field to determine a state of an access point having a first component and a second component that are separable from each other to create an opening and wherein a magnet is mounted on one of the first or second components of the access point, wherein the method comprises: operating the sensing component to sense a magnetic field in multiple dimensions to produce a sample representation of the sensed magnetic field, wherein the sample representation is a multi-dimensional representation and determining whether the sample representation is in a pre-determined region about a reference representation that is representative of a state of an access point to determine that the sensed magnetic field corresponds to said state of the access point, wherein the pre-determined region comprises a circular cross-section.

A sensing device comprises a microwave sensor (1) configured to emit microwave radiation and to receive microwave radiation reflected by a moving body in the field of detection of the microwave sensor and a wireless data transmitter (4) configured to transmit data to a remote receiver. A main power supply provides electrical power at a first voltage to the sensing device. A first regulator 6 provided between the main power supply and the microwave sensor (1) provides a sensor power supply to the microwave sensor (1) at a voltage below the voltage of the main power supply. The wireless data transmitter (4) is powered from the main power supply via a transmitter power supply connection arranged in parallel with the first regulator (6). The microwave sensor (1) is provided on a first circuit board and the wireless data transmitter (4) is provided on a second circuit board, with the second circuit board overlying the first circuit board and spaced therefrom. A signal processing device is configured to receive an output signal from the microwave sensor and to generate an occupancy signal indicative of the presence of a moving body in the field of detection of the microwave sensor (1) when the output signal of the microwave (1) sensor (1) exceeds a threshold level. The signal processing device is configured to increase the threshold level temporarily during data transmission by the wireless data transmitter (4), in order to compensate for RF interference due to the data transmission.

A sensing device comprises a microwave sensor (1) configured to emit microwave radiation and to receive microwave radiation reflected by a moving body in the field of detection of the microwave sensor and a wireless data transmitter (4) configured to transmit data to a remote receiver. A main power supply provides electrical power at a first voltage to the sensing device. A first regulator 6 provided between the main power supply and the microwave sensor (1) provides a sensor power supply to the microwave sensor (1) at a voltage below the voltage of the main power supply. The wireless data transmitter (4) is powered from the main power supply via a transmitter power supply connection arranged in parallel with the first regulator (6). The microwave sensor (1) is provided on a first circuit board and the wireless data transmitter (4) is provided on a second circuit board, with the second circuit board overlying the first circuit board and spaced therefrom. A signal processing device is configured to receive an output signal from the microwave sensor and to generate an occupancy signal indicative of the presence of a moving body in the field of detection of the microwave sensor (1) when the output signal of the microwave (1) sensor (1) exceeds a threshold level. The signal processing device is configured to increase the threshold level temporarily during data transmission by the wireless data transmitter (4), in order to compensate for RF interference due to the data transmission.

A security monitoring system includes at least one sensor configured to sense an event condition. A security monitoring system controller communicates with the sensor and an indicator of alarm and trouble conditions. The central security system also detects barometric pressure within a monitored area. The security system controller is configured to receive an event signal indicative of an event from the at least one of the sensors and receive an indication of the barometric pressure from a barometer. When the barometric pressure from the barometer indicates a change in barometric pressure, the security monitoring system controller confirms that the event is present and outputs an indication signal to the indicator based on the confirmed event. When the barometric pressure from the barometer does not indicate a change in barometric pressure, the security monitoring system controller suppresses the output of the indication signal.