Abstract: The present invention discloses a water quality monitoring device and system. By revealing at least a part of a tube above the water surface, water quality data detected below the water surface is transmitted. The water quality monitoring device sequentially includes, from top to bottom, an upper tube, a first connecting member and a middle tube. The water quality monitoring device appearing slightly long tubular further consists of a signal transceiving module in the upper tube, a monitor in the middle tube, and a sensing portion protruding out of the middle tube. A water quality monitoring system can further be formed by connecting a plurality of water quality monitoring devices to a network to monitor water quality conditions at a remote end, thereby monitoring water quality conditions in real time.

Abstract: A power control system for car computer includes a power switching circuit located between a power input terminal of a computer host and an external power source, such that the computer host outputs a keep-power-on signal when a key power is supplied thereto; a power ON/OFF circuit receiving the keep-power-on signal to thereby connect the external power source to the computer host; a key power detection circuit for constantly detecting whether the key power is ON, so that the computer host outputs a shut-down signal when the key power is OFF; a computer shut-down circuit for receiving the shut-down signal from the computer host and thereby driving the computer host to execute shut-down procedures; and a power OFF circuit for sensing an OFF state of the key power and outputting a control signal to drive the power ON/OFF circuit to disconnect the external power source from the computer host.

Abstract: A coupling structure for microcomputer cases includes at least two microcomputer cases and at least two coupling units for coupling the two cases together. Each of the cases is provided along four longitudinal outer corners with a slide channel each. The coupling units each include a longitudinally extended body portion and two insertion ribs separately extended along and from two longitudinal sides of the body portion. The insertion ribs are configured corresponding to the slide channels on the cases to be slidably fitted in the slide channels on two adjoining sides of the two cases that are juxtaposed or stacked, so as to firmly couple the two cases together.

Abstract: A heat-radiating microcomputer case includes a base having a bottom wall and two upright side walls, a top cover having a plurality of radiating fins formed on a top surface thereof, and a system unit located below a bottom surface of the top cover. Each of the two upright side walls of the base has a free edge with an insertion channel formed along an outer corner thereof. The top cover has two downward extended insertion sections slidably fitted in the insertion channels on the base to detachably assemble to the base. The system unit includes a circuit board having a heat-producing electronic element arranged on an upper side thereof to contact with the bottom surface of the top cover, so that heat produced by the electronic element may be transferred to the large-area top cover and dissipated into ambient air quickly.

Abstract: A microcomputer case includes a base and a top cover detachably assembled to a top of the base. The base includes a bottom wall and two upright side walls perpendicularly upward extended from two lateral edges of the bottom wall. Each of the two upright side walls is formed along an outer corner of a free edge with an insertion channel. The top cover is provided along two lower lateral edges with two downward extended insertion ribs corresponding to the insertion channels on the base. The insertion ribs of the top cover are slidably fitted in the insertion channels of the base, enabling the microcomputer case to be easily disassembled and reassembled for carrying out the expansion of internal and external hardware thereof.

Abstract: An expansion structure for microcomputer includes a case having two end panels; a motherboard being installed in the case and provided with at least a connection port, a central processing unit, a plurality of electronic elements, a storage unit, and a plurality of push keys and external peripheral device connectors accessible at the end panels of the case; an adaptation connector arranged on the motherboard and electrically connected to the connection port, and the adaptation connector having a socket located on one of the end panels of the case; and an expansion interface card having an I/O connector provided along an edge thereof for plugging in the connection port on the motherboard. Desired external peripheral devices may be connected to the adaptation connector and/or the expansion interface card to conveniently achieve the expansion of the functionality of a microcomputer.

Abstract: A power control system for car computer includes a power switching circuit located between a power input terminal of a computer host and an external power source, such that the computer host outputs a keep-power-on signal when a key power is supplied thereto; a power ON/OFF circuit receiving the keep-power-on signal to thereby connect the external power source to the computer host; a key power detection circuit for constantly detecting whether the key power is ON, so that the computer host outputs a shut-down signal when the key power is OFF; a computer shut-down circuit for receiving the shut-down signal from the computer host and thereby driving the computer host to execute shut-down procedures; and a power OFF circuit for sensing an OFF state of the key power and outputting a control signal to drive the power ON/OFF circuit to disconnect the external power source from the computer host.

Abstract: A conductive heat dissipating device for microcomputers includes a motherboard having an opening and a first electric connector installed adjacent to the front side of the opening, an adapter board having a second electric connector connected to the first electric connector on the front side of the opening, a processor soldered at the back of the adapter board or a third electric connector for inserting a processor, such that the processor is placed upside down into the opening, and a heat dissipating board connected to the back of the motherboard and in contact with the surface of the processor, and the heat dissipating board is in contact with a special heat dissipating structure in a chassis to define an external conductive heat dissipating device capable of dissipating the heat to the outside, reducing the size of the microcomputer, shortening the distance of thermal conduction, and improving the heat dissipation.

Abstract: A computer mainframe includes a housing, a motherboard, an intermediate circuit board, and a supporting bracket. A CD-ROM and a hard disk are attached to upper and lower sides, respectively, of the intermediate circuit board to sequentially superpose on and electrically connect to the motherboard via various connecting terminals provided at specific positions on the upper and the lower side of the intermediate circuit board. With the vertically superposed architecture of the mainframe, no space-occupying flat cable is needed for wiring the mainframe, enabling the mainframe to have a largely reduced volume.