An obscuration cloud generation device (100) comprises a housing (101) having a door (102) and a frame (103) sized and shaped to accommodate an obscuration cloud generating canister (110) when the door (102) is in a closed state. Activation of the canister (110) emits a composition for forming the cloud. The door (102) has an operably open state in which the door (102) is open at least a predefined minimum extent for exiting of the emitted composition. A door checking system (104) applies a force for opening the door (102) and generates an indication of whether the door (102) is open at least to the minimum extent. A controller (105) is adapted to instruct the checking system (104) to apply the force and to receive the indication to determine, before activating the canister (110), that the door (102) is not blocked from reaching the operably open state.

Methods and apparatus for monitoring remotely located objects with a system including at least one master data collection unit, remote sensor units, and a central data collection server are described. The master unit is configured to monitor any object, mobile or stationary, including monitoring multiple remote sensor units associated with the monitored objects. The master unit may be in a fixed location or attached to a mobile object. The master unit is configured for monitoring objects that enter and leave an area. The master unit may act as a parent controller for one or more child devices including remote sensors or monitors of measurable conditions including environmental conditions, substance identification, product identification, and/or biometric identification. The master unit may discover remote sensor units as they enter or leave the area where the master unit is located. The master unit can be remotely reprogrammed such as with authenticated instructions.

A monitor circuit is configured to receive sensor data samples at a first bit rate. The monitor circuit includes a sensor data processing circuit that is coupled to a sensor node and is configured to generate a sensor data characteristic signal for each sensor data sample. The sensor data characteristic signal for a particular sensor data sample indicates a value of a monitored parameter of the particular sensor data sample. The monitor circuit also includes a fault trigger circuit configured to determine, based on the sensor data characteristic signal, whether the sensor data samples satisfy a fault trigger. The monitor circuit further includes a summarization circuit configured to generate a sensor data summary signal based on the sensor data characteristic signal. The sensor data summary signal is provided to a summary output node at a second bit rate that is less than the first bit rate.

A monitor circuit is configured to receive sensor data samples at a first bit rate. The monitor circuit includes a sensor data processing circuit that is coupled to a sensor node and is configured to generate a sensor data characteristic signal for each sensor data sample. The sensor data characteristic signal for a particular sensor data sample indicates a value of a monitored parameter of the particular sensor data sample. The monitor circuit also includes a fault trigger circuit configured to determine, based on the sensor data characteristic signal, whether the sensor data samples satisfy a fault trigger. The monitor circuit further includes a summarization circuit configured to generate a sensor data summary signal based on the sensor data characteristic signal. The sensor data summary signal is provided to a summary output node at a second bit rate that is less than the first bit rate.

A system includes one or more sensors to monitor at least one compartment of an object. A processor is communicatively-coupled to the one or more sensors to determine an alarm event based on activation of at least one sensor of the one or more sensors.

A system includes one or more sensors to monitor at least one compartment of an object. A processor is communicatively-coupled to the one or more sensors to determine an alarm event based on activation of at least one sensor of the one or more sensors.

A device and a method for providing an indication to a user regarding events associated with a device. A method includes detecting a plurality of events associated with a device and communicating the detected events to a controller of the device. The method includes generating a command for each of the detected events and communicating the command to a voltage generator of the device. The method includes generating voltage based on the command and applying the generated voltage to one or more electro-chromic layers of a plurality of electro-chromic layers embedded in the device. The method includes glowing a color by the one or more electro-chromic layers on the device by application of the generated voltage.

Methods, systems, and apparatus, including computer programs encoded on a storage device, are disclosed. A system includes one or more processors and one or more computer storage media storing instructions that are operable, when executed by the one or more processors, to cause the one or more processors to perform operations comprising: obtaining, by the system, video of a scene captured by a camera; determining a likelihood that the camera will be tampered with based on the video of the scene; determining that the likelihood that the camera will be tampered with satisfies criteria; and transmitting data generated from the video.

A contact sensor includes a permanent magnet, first and second magnetic field sensors, and a computing device in communication with the first and second magnetic field sensors and configured to execute an “Open/Close” function to generate an “Open/Close” decision, and a “Masking” function to generate a “Masking” decision, based on at least one of a first measurement from the first magnetic field sensor or a second measurement from and the second magnetic field sensor.

The disclosure relates to an alarm system comprising a plurality of detectors, each configured to detect an event in an environment and to emit an event detection signal, and a plurality of alarm signal emitters, each configured to emit at least one alarm signal in case of the detection of an event, the detectors and the emitters being linked to one another, wherein each of the emitters is configured to emit a plurality of distinct alarm signals. In case of the detection of an event by a first detector, a first identifier is assigned to at least one first emitter, the closest to the first detector out of the plurality of emitters, and an alarm generation instruction is transmitted to the first emitter with the first identifier, to activate the first emitter with a first alarm signal which is a function of the first identifier.