Abstract: A water quality monitoring device and a monitoring method thereof are provided. The water quality monitoring device includes a water tank, a first and a second optical detection devices and a control circuit. The water tank has an accommodating space to carry a liquid. The first optical detection device provides a first light to detect and obtain a first reference light intensity, a first scattered light intensity, and a first penetrating light intensity. The second optical detection device provides a second light to detect and obtain a second reference light intensity, a second scattered light intensity, and a second penetrating light intensity. The control circuit calculates a water quality detection value of the liquid based on the first reference light intensity, the first scattered light intensity, the first penetrating light intensity, the second reference light intensity, the second scattered light intensity, and the second penetrating light intensity.

Abstract: A detection circuit employed in an electronic device includes an alternating current (AC) power source, a switch unit, a timer, a controller, and a baseboard management controller (BMC). The electronic device includes at least two power supply units. The controller is electronically connected between the timer and the switch unit. The timer outputs signals at predetermined intervals, the controller controls the switch unit to turn on/off according to the signals. The AC power source connects to/disconnect from the at least two power supply units through the switch unit accordingly. The BMC records a running states of the electronic device, and determines the running states of each of the at least two power supply units according to the recorded running states of the electronic device.

Abstract: A first terminal of a first switch, a first idling pin, a third idling pin, and a power pin are connected together. A second terminal of the first switch, a first ground pin, a second ground pin, and a third ground pin are electrically connected together. A first terminal of the second switch, a second idling pin, a fourth idling pin, and a reset pin are electrically connected together. A second terminal of the second switch, a first ground pin, a second ground pin, and a third ground pin are electrically connected together. The first switch controls the motherboard to power on or power off, and the second switch controls the motherboard to reset.

Abstract: A monitor includes a display circuit used for controlling display of the monitor. A camera is disposed on a frame of the monitor, and includes a plurality of signal pins. A power circuit is used for providing power to the display circuit and the camera. A monitor video interface mates with a video interface of a motherboard of a host computer. The monitor video interface includes a plurality of video pins connected to the display circuit, and a plurality of idle pins connected to the plurality of signal pins of the camera. A power pin and a ground pin of the camera are correspondingly connected to a power pin and a ground pin of the power circuit.

Abstract: A first terminal of a first switch, a first idling pin, a third idling pin, and a power pin are connected together. A second terminal of the first switch, a first ground pin, a second ground pin, and a third ground pin are electrically connected together. A first terminal of the second switch, a second idling pin, a fourth idling pin, and a reset pin are electrically connected together. A second terminal of the second switch, a first ground pin, a second ground pin, and a third ground pin are electrically connected together. The first switch controls the motherboard to power on or power off, and the second switch controls the motherboard to reset.

Abstract: A monitor includes a display circuit used for controlling display of the monitor. A camera is disposed on a frame of the monitor, and includes a plurality of signal pins. A power circuit is used for providing power to the display circuit and the camera. A monitor video interface mates with a video interface of a motherboard of a host computer. The monitor video interface includes a plurality of video pins connected to the display circuit, and a plurality of idle pins connected to the plurality of signal pins of the camera. A power pin and a ground pin of the camera are correspondingly connected to a power pin and a ground pin of the power circuit.

Abstract: A monitor for a host computer includes a display circuit, a peripheral equipment interface, a power circuit, and a monitor video interface. The display circuit is capable of controlling display of the monitor. The peripheral equipment interface is disposed on a frame of the monitor. The peripheral equipment interface includes a plurality of signal pins. The power circuit is capable of providing power to the display circuit and the peripheral equipment interface. The monitor video interface mates with a video interface of a motherboard of the host computer. The monitor video interface includes a plurality of video pins and idle pins. The video pins are connected to the display circuit. The idle pins are connected to the idle pins of the motherboard video interface. The idle pins of the motherboard video interface are connected to a chip of the motherboard.