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 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: A monitoring system includes a controller, a number of input devices, a number of digital sensors, a number of analog 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 digital sensor or connected to an analog sensor and a first power source in series. The controller controls the switching circuit of the input device to receive a digital signal of the digital sensor or an analog signal of the analog sensor and output 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: A sampling rate adjustment system includes a detecting circuit and a processor. The detecting circuit detects a frequency of an alternating current (AC) power source and outputs a detecting signal. The processor receives the detecting signal of the detecting circuit and determines whether a difference between the frequency of the AC power source and a sampling rate of a camera is less than a predetermined value. The processor outputs a control signal to the camera and changes the sampling rate of the camera when the difference between the frequency of the AC power source and the sampling rate of the camera is less than the predetermined value.

Abstract: A monitoring system includes a controller, a number of input and output (I/O) devices, a number of sensors, and a number of electronic devices. Each I/O device comprises an input circuit, an output circuit, and a connector. The connector is connected to a sensor or an electronic device. The controller controls the I/O device to function as an input device or an output device. When the I/O device functions as an input device, the input circuit transmits a voltage signal to the controller. When the I/O device functions as an output device, the output circuit supplies power to the electronic device and the controller detects the voltage of the electronic device via the input circuit.

Abstract: An exemplary portable electronic device includes a housing, a circuit board, starting module set on the circuit board for starting the portable electronic device, and an assembly module. The assembly module helps assembles the housing and the circuit board together and forms a part of circuitry associated with the starting module. When the assembly module is disassembled from the housing and the circuit board, the starting module cannot start the portable electronic device.

Abstract: A pin header connector includes a number of electrically conductive pins, two insulating plates, and a supporting body. The pins are arranged in two parallel rows. Each of the rows comprises at least three pins. Each of the insulating plates defines a number of through holes corresponding to the pins. Each of the pins extends through the corresponding through hole. The supporting body defines slots accommodating the respective pins. The supporting body is sandwiched between the insulating plates.

Abstract: A monitoring system includes a controller, a plurality of sensors, a plurality of alarms, and a plurality of input/output devices. Each input/output device is connected between the controller and a sensor or an alarm. Each input/output device includes an input circuit, an output circuit, and a connector. The input circuit and the output circuit are connected between the controller and the connector. The connector is further selectively connected to a sensor or an alarm and a DC power in series. The controller controls a status of the input circuit and the output circuit. When the connector is connected to the alarm, the input circuit does not operate. The controller outputs a motion signal to the alarm via the output circuit. When the connector is connected to the sensor, the output circuit does not operate. The sensor outputs a detection signal to the controller via the input circuit.

Abstract: A monitoring system includes a controller, a number of sensors, a number of alarms, and a number of input/output devices. Each input/output device is connected between the controller and a sensor or an alarm. Each input/output device includes an input circuit, an output circuit, and a connector to selectively connect to the sensor or the alarm. The input circuit and the output circuit are connected between the controller and the connector. The controller controls status of the input circuit and the output circuit. When the connector is connected to the alarm, the controller controls the alarm to work via the output circuit. When the connector is connected to the sensor, the sensor outputs a detection signal to the controller via the input circuit.

Abstract: A monitoring system includes a controller, a number of input and output devices, a number of sensors, and a number of electronic devices. Each input and output device includes a switching circuit, a first input circuit, a second input circuit, and a connector. The connector is connected to a sensor or an electronic device. The controller controls the switching circuit to receive a detecting signal of the sensor or supply power to the electronic device. The first input circuit and the second input circuit are connected between the switching circuit and the controller.

Abstract: An electronic device includes an enclosure, and an operation device. The enclosure includes a first sidewall, and a second sidewall connected to a rear end of the first sidewall. A receiving recess is defined in the first sidewall and extends through the second sidewall, to receive a universal serial bus (USB) device. A USB port is installed in receiving recess away from the second sidewall, to be connected to the USB device. The operation device is pivotably connected to the receiving recess and includes two spaced arms to sandwich the USB device when the USB device is connected to the USB port. When the operation device is rotated in a predetermined direction, the arms move toward the second sidewall, to push the connected USB device to disengage from the USB port.

Abstract: In the disclosed technology, the device identification code of a memory integrated circuit is changeable. In some cases, multiple device identification codes are stored on the memory integrated circuit, and multiple device identification code selection data are stored on the memory integrated circuit.

Abstract: A digital camera includes a bezel and an extending ring. The bezel includes a convex ring and at least one fixing portion. The convex ring is positioned on a center of the bezel. The fixing portion is defined on an outer sidewall of the convex ring. The extending ring includes a sleeve, a flange, and at least one fastening portion. The sleeve is placed around the outer sidewall of the convex ring. The flange extends from an end of the sleeve and abuts the convex ring. The fastening portion cooperates with the fixing portion.

Abstract: An adjusting system for a projector includes a reference point projection unit, an infrared apparatus, a micro controller unit (MCU), and a graphic processing unit (GPU). The reference point projection unit stores reference points. The reference points are projected on a screen to form projection points. The infrared apparatus includes infrared devices mounted on a front surface of a body of the projector. The infrared devices emit infrared signals to the screen and form light points on the screen. When a projection angle of the projector is 0 degrees, the light points overlap the projection points respectively. When the projection angle of the projector is a certain angle, the MCU controls the GPU to make adjustment corresponding to the infrared devices which receive the reflected infrared signals, until the projection points overlap the light points respectively.

Abstract: An Internet Protocol (IP) camera management system and method determines a MAC address of an IP camera corresponding to a communication channel, searches an IP address of the IP camera through the determined MAC address of the IP camera, then establishes connection between the IP camera management system and the IP camera through the searched IP address. Furthermore, video image data are acquired from the IP camera through the communication channel and are displayed on a display interface.

Abstract: A pin header connector includes a number of electrically conductive pins, two insulating plates, and a supporting body. The pins are arranged in two parallel rows. Each of the rows comprises at least three pins. Each of the insulating plates defines a number of through holes corresponding to the pins. Each of the pins extends through the corresponding through hole. The supporting body defines slots accommodating the respective pins. The supporting body is sandwiched between the insulating plates.

Abstract: A temperature control circuit includes a microprocessor, a temperature detecting module, and a heating module. The temperature detecting module includes a thermistor and a first switch. The thermistor is operable to sense a temperature to turn on or off the first switch for outputting a detection signal to the microprocessor. The heating module includes a heater and a second switch. The microprocessor controls the second switch to turn on or off for making the heater works or stop working according to the detection signal.

Abstract: An automobile light control system includes first and second light groups, a battery, a micro control unit (MCU), a speed sensor, first and second switches, and an electronic switch. The battery is connected to the first light group through the first switch. The first light group is connected to the first terminal of the electronic switch through the second switch. The second terminal of the electronic switch is connected to the second light group. The control terminal of the electronic switch is connected to the MCU. The MCU is connected to the speed sensor to receive a speed signal. The MCU controls the electronic switch to be turned on in response to the speed signal being greater than a predetermined value. The MCU controls the electronic switch to be turned off in response to the speed signal being less than or equal to the predetermined value.

Abstract: A temperature control circuit includes a microprocessor, a protection module, a first temperature detecting module, a second temperature detecting module, and a heating module. The first temperature detecting module includes a first thermistor and a first comparator connected to the first thermistor. The first thermistor is operable to sense a temperature to make the first comparator output a first signal to the microprocessor and the protection module. The protection module is operable to control the microprocessor to work or reset according to the first signal. The second temperature detecting module includes a second thermistor and a second comparator connected to the second thermistor. The second thermistor is operable to sense a temperature to make the second comparator output a second signal to the microprocessor. The heating module includes a heater. The microprocessor controls the heater to work or not to work according to the first and second signals.

Abstract: A projector includes a projector body, a lens module, and a base rack. The front panel of the projector body defines a though hole. The lens module includes a lens body rotatably mounted to the projector body, a sliding bracket, and a lens extending from the lens body to extend through the through hole of the projector body, and a sliding bracket connected to the lens body via parallel connecting poles. The sliding bracket is slidably mounted to the base rack. The base rack is rotatably mounted to the projector body. A height of the lens is operable to be adjusted by changing the positions of the sliding bracket on the base rack.