Abstract:
A digital camera includes a bezel and an extending ring. The bezel defines a circular-shaped recess, and N pairs of support arms are positioned on the inner sidewall of the recess. The N is an integer equaling or exceeding 2. Each of the pairs of support arms has different height and the two support arms in each of the pairs of support arms are symmetrically placed with respect to a central axis of the recess. The extending ring defines N−1 pairs of bar-shaped slots. An end of the extending ring contacts an end surface of one of the N pairs of support arms, and the N−1 pairs of bar-shaped slots are positioned corresponding to the other N−1 of the N pairs of support arms.
Abstract:
A projector includes a housing, a lens module pivotally connected to the housing, a first adjustment mechanism adjusting a pitch of the housing, and a second adjustment mechanism adjusting a pitch of the lens module. The first adjustment mechanism includes a threaded base fixed to the housing, and a support leg extending out of the housing and comprising a threaded portion. The second adjustment mechanism includes a first gear driven by the support leg, a second gear engaging the first gear, a first threaded member fixed to the second gear, a first connecting member pivotally connected to the lens module, a second connecting member slidably connected to the first connecting member, and a second threaded member. The second threaded member is fixed to the second connecting member, and threaded on and slidable relative to the first threaded member.
Abstract:
A monitoring system includes at least one network camera distributed in an area to be monitored, an access point device connected with the at least one network camera. The access point device includes ports, micro control units, and a central processing unit. Each micro control unit is connected to one of the ports, and the central processing unit is connected with the micro control units. The central processing unit assigns an IP pool to each micro control unit and receives captured images from the ports. Each micro control unit assigns an IP address from the IP pool to a corresponding network camera, and manages the captured images according to the IP addresses.
Abstract:
A monitoring system includes a controller, a number of input devices, a number of first sensors, a number of second sensors, and a number of alarms. Each input device comprises a switching circuit, an input circuit, and a connector. The connector is connected to a first sensor and a voltage source in series or connected to a second sensor and a current source in series. The controller controls the switching circuit of the input device to receive a voltage signal of the first sensor or a current signal of the second sensor and send out a corresponding detection signal. The input circuit transmits the detection signal to the controller. The controller controls the corresponding alarm to work according to the detection signal.
Abstract:
An electronic device with function expansion capabilities includes a first connector, a second connector, and an expansion circuit. The first connector matches the second connector. The expansion circuit is connected between the first connector and the second connector. The expansion circuit of one electronic device communicates with the expansion circuit of another electronic device, in response to the first connector of one electronic device engaged with the second connector of another electronic device, so that the two expansion circuits are integrated together.
Abstract:
A monitoring system applies to a long distance transmission. A number of data acquisition devices records still images and video as signals and converts the video signals into voltage signals suitable for transmission. A monitoring host connected to the number of data acquisition devices via a network cable for long distance transmission processes the voltage signals to show the video.
Abstract:
A network camera includes a capturing unit, a video converter, an audio converter, a microprocessor, and a signal sending unit. The capturing unit captures an analog video signal and an analog audio signal. The video converter converts the analog video signal to a digital video signal; the audio converter converts the analog audio signal to a digital audio signal. The microprocessor superposes and compresses the digital video signal and the digital audio signal and outputs a first universal serial bus (USB) signal. The signal sending unit converts the first USB signal to a wireless USB signal.
Abstract:
An airflow speed detection device for measuring an airflow speed includes an airflow speed switch, and a connector. The airflow speed switch includes a detection head, and an elastic piece. The connector is electrically connected to the testing the airflow speed switch to connect an indicator to indicate close and open states of the airflow speed switch. If the airflow speed is not faster than a critical value, the elastic piece contacts the detection head to close the airflow speed switch. If the airflow speed is faster than the critical value, the elastic piece is blown away from the detection head to open the airflow speed switch.
Abstract:
A cable binding apparatus includes a flexible binding strip defining a column of teeth, a connection element, and a positioning element. The binding strip and the positioning element are both connected to the connection element. The positioning element includes a connection portion defining a through hole and a flexible block portion arranged in the through hole. The binding strip is operable to be bent freely, with a distal end of the binding strip inserted into the through hole of the positioning element. The block portion is operable to engage with one of the column of teeth, to bind cables via the binding strip.
Abstract:
An airflow detection apparatus includes an enclosure defining a through hole therein, a conductive pole received in the through hole of the enclosure, a first conductive board electrically connected to a first end of the conductive pole and an electrode of a power source, and a second conductive board electrically connected to the other electrode of the power source. The first and second conductive boards are respectively attached to a top end and a bottom plate of the enclosure. The second conductive board defines a through hole therein to make an end of the conductive pole to pass therethrough, and a diameter of the through hole of the second conductive board is greater than that of the conductive pole. When the conductive pole is driven by an airflow, it will swing to contact with a side bounding the through hole of the second conductive board.