Abstract: A motherboard includes a power circuit, a system power supply, and a central processor unit (CPU). The power circuit includes a direct current (DC) voltage input terminal. A first control circuit receives a direct current (DC) voltage through the DC voltage input terminal and outputs a first control signal. A second control circuit receives the first control signal and outputs a second control signal to the CPU and output a third control signal. A switching circuit includes a number of switches. The second control signal controls the corresponding switches to be on or off. A voltage converting circuit receives the third control signal and converts the DC voltage from the DC voltage input terminal, and outputs the converted DC voltage to the system power supply. The CPU receives the second control signal and controls the motherboard operation.

Abstract: A reset circuit includes two voltage dividing circuits, a switching circuit, a selection button, two voltage converters, and a processor. The voltage converters convert a first or second power supply for supplying power to the processor. When the first power supply supplies power to the processor the processor operates normally. When the second power supply supplies power to the processor, one of the voltage dividing circuits outputs a signal to the processor to restore an electronic device to factory settings according to the signal.

Abstract: A board-to-board connector includes a double plastic pin header connector and a supporting plate. The double plastic pin header connector includes two opposite positioning plates, and a number of pin headers arranged in two rows and extending through the positioning plates. The supporting plate is placed between the two rows of pin headers, with opposite ends of the supporting plate resisting against the corresponding positioning plates.

Abstract: A system and method for adjusting image parameters of cameras first determines if there are disqualified cameras whose image parameters need to be adjusted according to an image quality of the captured image of each camera, outputs the captured image of each of qualified cameras whose image parameters do not need to be adjusted, determines if the image parameters of each of the disqualified cameras are adjusted through a network. The image parameters are updated by each of the disqualified cameras itself if the image parameters of the disqualified camera are not adjusted through the network, or the image parameters of each of the disqualified cameras are updated by the computer using a broadcast mode or a non-broadcast mode with user-defined values if the image parameters of the disqualified camera are adjusted through network.

Abstract: A control circuit includes a current sensing circuit, an analog digital converter (ADC), an amplifying circuit, a processor, and a switching circuit. The current sensing circuit senses current supplied to an electronic device by a power supply and outputs a first voltage signal. The amplifying circuit amplifies the first voltage signal output from the current sensing circuit to a second voltage signal. The ADC converts the second voltage signal to a digital signal. The processor outputs pulse width modulation (PWM) signals according to the digital signal. The switching circuit receives the PWM signals to control a fan of the electronic device according to the PWM signals.

Abstract: A master-slave communication system includes a master device, a plurality of slave devices, and a bus providing communication channels therebetween. The master device includes a first micro control unit (MCU), a first power supply module, and an address setting module. Each slave device includes a second MCU and a second power supply module connected to the first power supply module through the address setting module. The address setting module detects a current output from the first power supply module, and outputs an ID address setting signal which is directly proportional with the current to the first MCU and the second MCU of a new slave device, the second MCU of the new slave device sets an ID address according to the ID address setting signal, the first MCU records the ID address as the ID address of the new slave device according to the ID address setting signal.

Abstract: An outdoor monitoring system includes a camera, a direct-current adapter, a solar cell unit and a power management unit. The power management unit includes a controller, a rechargeable power source, a first voltage detection circuit, and a second voltage detection circuit. The first voltage detection circuit detects a charging voltage of the solar cell unit for charging the rechargeable power source. The second voltage detection circuit detects an output voltage of the rechargeable power source applied to the camera. The controller selectively connects the rechargeable power source or the direct-current adapter to the camera according to the output voltage and connects or disconnects the rechargeable power source to the solar cell unit according the output voltage and the charging voltage.

Abstract: An illumination adjustment circuit includes a light sensitive unit, an amplification unit, a switch unit, and a light emitting unit. The switch unit includes a plurality of electronic switches with increasing threshold voltages. The light emitting unit includes a plurality of sets of light emitting diodes corresponding to the electronic switches. Each set of the light emitting diodes is connected to the amplification unit through one of the electronic switches corresponding thereto. The light sensitive unit detects the brightness of ambient light, outputting a first voltage to the amplification unit accordingly. The amplification unit amplifies the first voltage to a second voltage and outputs the second voltage to the switch unit, so that the electronic switches with the threshold voltages lower than the second voltage are turned on, and the set of light emitting diodes connected to the electronic switch becomes luminous.

Abstract: An infrared cut filter removable (ICR) module control apparatus includes a photoresistor, first to sixth electronic switches, an ICR module, a comparator, and a central processing unit (CPU). A first terminal of the photoresistor is connected to a power supply through a resistor. A second terminal of the photoresistor is grounded, and connected to the second to fourth electronic switches and the CPU through the first electronic switch. The second electronic switch is connected to the fifth and sixth switches. A node between the third and fourth switches is connected to a first input terminal of the ICR module and the non-inverting terminal of the comparator. A node between the fifth and sixth switches is connected to a second input terminal of the ICR module and the inverting terminal of the comparator. The CPU is connected to the output terminal of the comparator and connected to the first electronic switch.

Abstract: A system includes a master device and a number of slave devices connected to the master device via a bus. Each slave device includes a control unit, a switch unit, and a lock unit. When a new slave device is connected to the system, the control unit of the new slave device transmits a request signal to the master device. The master device detects whether the master device is communicating with the already connected slave devices after receiving the request signal, and outputs an enable signal to the new slave device according to the detected result. The control unit of the new slave device controls the lock unit of the new slave device to turn on and turn off the switch unit of the new slave device according to the enable signal.

Abstract: An iris calibration device includes one or more groups of light sources, a microcontroller (MCU), and a display. The MCU connects to a system on chip (SoC) of a digital camera device. The digital camera device includes an iris lens. The MCU receives an “on” command or an “off” command from the SoC. The MCU turns on or turn off a group of light sources according to the “on” command or the “off” command The SoC adjusts the iris lens according to an average luminance of the one or more light sources sensed by a sensor of the digital camera device.

Abstract: A method for security monitoring of an electronic device includes determining whether a storage system of the electronic device is a secured storage system according to a signal of a first switch of the electronic device, determining whether an encryption key of the secured storage system is modifiable according to a detected signal of a second switch of the electronic device. Decrypting the secured storage system using a decryption key if the decryption key is the same as a preset decryption key in the secured storage system.

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: A master-slave communication circuit includes a master device, a number of slave devices, and a bus providing communication channels between the master device and the slave devices. Each slave device includes an identification (ID) address setting unit, a plug-in detecting pin, and a plug-out detecting pin. The identification (ID) address setting unit is connected to the bus to receive an ID address setting signal transferred from the master device, and set an ID address to the corresponding slave device. The master sets the ID addresses of the slave devices according to voltage levels of the plug-in detecting pin and the plug-out detecting pin, to make the ID addresses of the slave devices connected to the bus are different.

Abstract: A delay circuit used in a schedule controller includes a voltage detection unit, a timer, and a first electronic switch. The voltage detection unit receives an input voltage and compares the input voltage with a predetermined voltage. The timer is controlled by the voltage detection unit to calculate duration of an interval time. The first electronic switch is switched on or off under the control of the timer. When the input voltage substantially equals or exceeds the predetermined voltage, the timer calculates duration of the interval time, the timer generates and transmits a switch signal to the first electronic switch when the timing is reached, and the first electronic switch is switched on by the switch signal and provides an output voltage.

Abstract: A control circuit includes a triangular wave generating circuit, a temperature sensing circuit, a first comparator, and a switching circuit. The triangular wave generating circuit outputs a triangular wave signal. The temperature sensing circuit senses a temperature surrounding a fan and outputs a temperature signal. A non-inverting terminal of the first comparator is connected to the triangular wave generating circuit. An inverting terminal of the first comparator is connected to the temperature sensing circuit. The first comparator compares the triangular wave signal with the temperature signal to output a control signal. The switching circuit is connected between a power supply and the fan. The switching circuit turns on or off according to the control signal.

Abstract: An electronic device includes a housing, a circuit board arranged in the housing, a first connector, and a second connector. The first connector includes a panel formed at a first end of the first connector and located at an outer surface of the housing. The panel defines a number of first sockets to. A number of pins extend from a second end of the first connector. The second connector includes a first connecting portion and a second connecting portion. The first connecting portion defines a number of sockets to connect the pins of the first connector. The second connecting portion includes a number of pins connected to the circuit board.

Abstract: A fan control system for controlling a fan to dissipate heat from an electronic device includes a current detection circuit having a shunt resistor to receive current, a signal amplification circuit having an operational amplifier, and a switch circuit having an npn transistor and a pnp transistor. A first terminal of the shunt resistor is connected to the electronic device, a second terminal of the shunt resistor is connected to the electronic device via a power source and is grounded. A non-inverting terminal of the operational amplifier is connected to the first terminal of the shunt resistor, an inverting terminal of the operation amplifier is connected to the second terminal of the shunt resistor via a first resistor and connected to an output terminal of the operational amplifier via a second resistor. The output terminal of the operation amplifier is grounded via a third resistor and a sixth resistor.