A self-configuring sensor and method of operation of the sensor is described. In one embodiment, the self-configuring sensor comprises a first sub-sensor for determining a first status of a door or window, a second sub-sensor for determining a second status of the door or window, a wireless transmitter, a memory for storing processor-executable instructions, and a processor coupled to the first sub-sensor, the second sub-sensor, the wireless transmitter and the memory for executing the processor-executable instructions that cause the sensor to monitor the first and second sub-sensors for detecting changes in a first sub-sensor state and a second sub-sensor state, respectively, and determine an installation configuration based on the changes in the first sub-sensor state and the second sub-sensor state, the installation configuration comprising a type of hardware where the self-configuring sensor has been installed.

A self-configuring sensor and method of operation of the sensor is described. In one embodiment, the self-configuring sensor comprises a first sub-sensor for determining a first status of a door or window, a second sub-sensor for determining a second status of the door or window, a wireless transmitter, a memory for storing processor-executable instructions, and a processor coupled to the first sub-sensor, the second sub-sensor, the wireless transmitter and the memory for executing the processor-executable instructions that cause the sensor to monitor the first and second sub-sensors for detecting changes in a first sub-sensor state and a second sub-sensor state, respectively, and determine an installation configuration based on the changes in the first sub-sensor state and the second sub-sensor state, the installation configuration comprising a type of hardware where the self-configuring sensor has been installed.

A motion sensor includes a sensor element to sense a motion, and a controller communicably coupled to the sensor element. The controller is configured to set a detection sensitivity of the motion sensor to a maximum setting of the detection sensitivity. The controller is further configured to decrease the detection sensitivity of the motion sensor upon a detection of the motion until the motion is undetectable by the motion sensor at a decreased setting of the detection sensitivity. The controller is further configured to increase the detection sensitivity of the motion sensor until the motion sensor detects the motion at an increased setting of the detection sensitivity and to set the detection sensitivity of the motion sensor to a new setting based on the increased setting.

A monitoring system that is configured to monitor a property is described. The monitoring system includes a sensor that includes a battery and that is configured to generate sensor data based on activity in a portion of the property that is within a field of view of the sensor. The monitoring system further includes a monitor control unit that is configured to: after replacement of a battery of the sensor, receive and analyze the sensor data, based on analyzing the sensor data, determine a status of the portion of the property without recalibrating the field of view of the sensor, and provide, for output, a notification that includes data describing the status of the portion of the property.

A security system for a building comprises a pressure sensor and a computer system communicatively coupled with the pressure system. The pressure sensor coupled to a movable portion of a window in the building. The computer system is configured to: receive a first pressure measurement from the pressure sensor; compare the first pressure measurement to a reference pressure measurement; and based on the comparison, detect that the movable portion of the window has moved.

A smoke detection device includes a housing, a smoke collector, an optical detector and a cover plate. The housing has a piercing hole. The smoker collector has a smoke hole, and position of the smoke hole is close to position of the piercing hole. The optical detector is disposed inside the smoke collector and adapted to detect gaseous concentration inside the smoke collector. The cover plate is disposed between the housing and the smoke collector, and used to set a channel from the piercing hole to the smoke hole, so that gaseous matter flows from outside the smoke detection device into the smoke collector through the piercing hole and the smoke hole.

A method of calibrating a pan, tilt, zoom (PTZ) camera with a fixed camera utilizing an overview image of a scene captured by the fixed camera, and an image of the scene captured by the PTZ camera when directed in a first direction. By matching features in the overview image and the PTZ camera image, a first calibration is carried out by correlating the first direction to matching features in the overview image. A mapping between the PTZ camera image and the overview image is defined based on the matching features. The mapping is used to map an object from the PTZ camera image to the overview image. Based on an appearance of the mapped object, a quality of the mapping is calculated. If the quality is not good enough, the PTZ camera is redirected to a second direction, and a further calibration is carried out by again.

A fire detector system comprises a fire detector unit; a sensor disposed in the fire detector unit and arranged to detect the characteristics of a fire and to generate an output signal indicative of the characteristics detected by the sensor; and a processor arranged to receive the output signal from the sensor and to generate afire alarm signal when the output signal exceeds an alarm point threshold; wherein the system is arranged to change the alarm point threshold over time to compensate for drift in the response of the detector unit; wherein the fire detector unit includes a first sensitivity mode with a first drift compensation limit and a second sensitivity mode with a second drift compensation limit, the second sensitivity mode being more sensitive than the first; and wherein, as the first alarm point threshold in the first sensitivity mode is approached or reached, the mode of the system is changed to the second sensitivity mode.

A fire detector system comprises a fire detector unit; a sensor disposed in the fire detector unit and arranged to detect the characteristics of a fire and to generate an output signal indicative of the characteristics detected by the sensor; and a processor arranged to receive the output signal from the sensor and to generate afire alarm signal when the output signal exceeds an alarm point threshold; wherein the system is arranged to change the alarm point threshold over time to compensate for drift in the response of the detector unit; wherein the fire detector unit includes a first sensitivity mode with a first drift compensation limit and a second sensitivity mode with a second drift compensation limit, the second sensitivity mode being more sensitive than the first; and wherein, as the first alarm point threshold in the first sensitivity mode is approached or reached, the mode of the system is changed to the second sensitivity mode.

Systems and methods for delaying or activating a blowout device in a sampling pipe network of an aspirated smoke detection system are provided. Some systems can include an aspirated smoke detector, a sampling pipe coupled to the aspirated smoke detector, a blowout device coupled to the sampling pipe, and a delay device coupled to the blowout device. Responsive to the aspirated smoke detector detecting a triggering event, the delay device can delay the blowout device from performing a blowout action in the sampling pipe or can instruct the blowout device to perform the blowout action in the sampling pipe.