Abstract: This disclosure describes techniques for optimizing motion detection in systems that use passive infrared (PIR) detectors. The techniques comprise generating a first signal and a second signal by two sets of detector elements. The techniques further involve calculating a sum of the first signal and the second signal as well as a difference between the first signal and the second signal. The techniques may comprise determining whether a slope of either the sum or the difference exceeds a threshold slope value. If the slope exceeds the threshold slope value, a determination may be made as to whether an amplitude of the sum or difference exceeds a detection threshold. If the amplitude does exceed the detection threshold, then a motion detection event is detected. If the slope does not exceed the threshold slope value, the first signal and the second signal are zeroed out.

Abstract: A device includes a first housing, a camera residing at least partially within the first housing, a switch residing at least partially within the first housing, and a second housing coupled to the first housing and at least partially residing within the first housing. The switch is configured to disable the camera. The second housing includes a receptacle configured to receive a battery, and an arm having a tab configured to engage and disengage a lever of the switch to disable the camera. One or more contacts at least partially reside within the first housing and are configured to electrically connect to an accessory coupled to the first housing.

Abstract: An audio/video (A/V) device includes a first housing and a second housing that rotationally couples and uncouples to the first housing. The first housing includes a frame having a first cavity, a second cavity, and a wall disposed between the first cavity and the second cavity. The first housing further includes a mirror that extends between the first cavity and the second cavity, a first passive infrared (PIR) sensor at least partially disposed within the first cavity, and a second PIR sensor at least partially disposed within the second cavity. The second housing includes a loudspeaker.

Abstract: This disclosure describes, in part, techniques for using multiple passive infrared sensors to determine a distance to an object. For instance, an electronic device may include a first passive infrared sensor including a first FOV that extends a first distance from the electronic device and a second passive infrared sensor including a second FOV that extends a second distance from the electronic device further than the first distance. The electronic device may generate first sensor data using the first passive infrared sensor and second sensor data using the second passive infrared sensor. The electronic device may then determine a first amplitude associated with the first sensor data and a second amplitude associated with the second sensor data and determine a ratio between the amplitudes. After the ratio is determined, the electronic device may determine a distance associated with the ratio, generate image data based on the distance, and send the image data to computing device(s).

Abstract: A device includes a camera and a privacy cover configured to rotate between a first position and a second position. In the first position, the camera is deactivated and the privacy cover obstructs the camera. In the second position, the camera is activated and the camera is unobstructed by the privacy cover. A first indication is visible through a portion of the privacy cover in the first position, the first indication indicating that the camera is deactivated. A second indication is visible through the portion of the privacy cover in the second position, the second indication indicating that the camera is activated.

Abstract: A lens assembly includes a lens housing and a Fresnel lens array. The lens housing includes a first portion that defines an exterior surface and an interior surface, and a second portion. The second portion defines a cavity, where the interior surface is disposed within the cavity. The Fresnel lens array is disposed within the cavity and coupled to the interior surface. The Fresnel lens array includes a first lens element and a second lens element. The first lens element has first concentric grooves defined by first translation edges and first facets. The first translation edges are disposed at thirty degrees relative to a first center point of the first concentric grooves. The second lens element has second concentric grooves defined by second translation edges and second facets. The second translation edges are disposed at one degree relative to a second center point of the second concentric grooves.

Abstract: An audio/video (A/V) device includes a first housing and a second housing rotatably coupled to the first housing. The first housing includes a camera oriented in a first direction, one or more microphones oriented in the first direction, one or more first lighting elements oriented in the first direction, one or more second lighting elements oriented in a second direction, one or more third lighting elements oriented in a third direction, and one or more first contacts. The second housing includes a loudspeaker oriented in a fourth direction and one or more second contacts configured to engage with the one or one first contacts. An engagement between the one or more first contacts and the one or more second contacts communicatively couples the loudspeaker to computing components with the first housing.

Abstract: A device including a mount, a first arm coupled to the mount, and a second arm coupled to the mount. The first arm includes first teeth and the second arm includes second teeth. A first light assembly rotationally couples to the first arm, and includes a first coupler that engages with the first teeth. A second light assembly rotationally couples to the second arm, and includes a second coupler that engages with the second teeth. A camera assembly pivotably couples to the mount, and includes a camera, a first passive infrared (PIR) sensor, and a second PIR sensor.

Abstract: An electronic device includes a first passive infrared (PIR) sensor and a second PIR sensor positive vertically below the first PIR sensor. One or more lenses are shaped and positioned to focus light received at the one or more lenses onto the first PIR sensor and the second PIR sensor. The first PIR sensor has a first field of view (FoV), and the second PIR sensor has a second FoV that is vertically and horizontally offset from the first FoV.

Abstract: This disclosure describes techniques for optimizing motion detection in systems that use passive infrared (PIR) detectors. The techniques comprise generating a first signal and a second signal by two sets of detector elements. The techniques further involve calculating a sum of the first signal and the second signal as well as a difference between the first signal and the second signal. The techniques may comprise determining whether a slope of either the sum or the difference exceeds a threshold slope value. If the slope exceeds the threshold slope value, a determination may be made as to whether an amplitude of the sum or difference exceeds a detection threshold. If the amplitude does exceed the detection threshold, then a motion detection event is detected. If the slope does not exceed the threshold slope value, the first signal and the second signal are zeroed out.

Abstract: A magnetically joinable play tile comprising a tile body having an edge; and a rotatable magnet carried by tile body adjacent to the edge.

Abstract: An infrared motion sensor has a multi element IR detector with first and second separate arrays of optical elements associated with respective first and second detector elements and a partition of a material substantially opaque to IR radiation and substantially transparent to visible/NIR light arranged to separate the IR optical paths from the first and second optical elements to the respective first and second detector elements. In this way, the detector elements function individually with respect to IR radiation and individual optical elements produce separate and independently oriented fields of view on the first and second sides of the sensor, while visible/NIR light still falls on both detector elements so that detector element signals resulting from NIR radiation roughly cancel one another.

Abstract: An infrared motion sensor has a multi element IR detector with first and second separate arrays of optical elements associated with respective first and second detector elements and a partition of a material substantially opaque to IR radiation and substantially transparent to visible/NIR light arranged to separate the IR optical paths from the first and second optical elements to the respective first and second detector elements. In this way, the detector elements function individually with respect to IR radiation and individual optical elements produce separate and independently oriented fields of view on the first and second sides of the sensor, while visible/NIR light still falls on both detector elements so that detector element signals resulting from NIR radiation roughly cancel one another.

Abstract: A pyroelectric detector circuit comprises a pyroelectric sensor element connected to a load resistor and to an input of a buffer amplifier having a feedback path for multiplying the resistance of the load resistor at non-zero frequencies. This feedback enables the use of a smaller load resistor which is multiplied to produce a higher effective load resistance necessary for proper low frequency response of the detector circuit.

Abstract: A circuit is provided for generating a voltage signal corresponding to a wiper position in a linear or circular potentiometer having an open wiper position or an open wiper angle, respectively. The voltage signal circuit includes provisions for determining when a wiper is in an open wiper position or angle region. When the circuit is used with a freely rotating circular potentiometer, the voltage signal may be used to determine wind direction. The circuit includes a voltage source coupled to a conducting element and a wiper. A pulling resistor driven by an operational amplifier is coupled to the wiper and voltage source to provide an identifiable voltage signal corresponding to the open wiper state during rotation through the open wiper angle region.

Abstract: Methods and apparatus for remote calibration of combustible gas detectors in which calibration initiation signals are applied to a sealed, explosion-proof sensor assembly to effect a remote calibration sequence and storage of calibration factors.

Abstract: Methods and apparatus for measuring combustible gases in which an active sensor is maintained at controlled, temperature in respect of a reference sensor by means of a bridge-sampling system and a variable duty cycle system responsive to the bridge sampling system adapted to periodically bypass the current from the active sensor in a reference bridge network.

Abstract: A portable self-calibrating pH meter particularly adapted for use by unskilled operators in adverse environment conditions is disclosed which has a minimum of operator controls while preventing operator errors and while providing effective and accurate pH measurement.