摘要:
A tablet electronic device configured to electrically connect to a portable electronic device is provided. The portable electronic device includes a first connecting interface and a processing module. The tablet electronic device includes a body and a touch panel. The body includes a second connecting interface connected to the first connecting interface. The touch panel is disposed in the body to generate a touch signal after a touch, and when the portable electronic device is connected to the tablet electronic device, the touch panel displays information of the portable electronic device.
摘要:
A network camera includes a mainboard system and an audio/video capture system. The mainboard system includes a system-on-chip. The system-on-chip is configured for encoding video files captured by the network camera. The audio/video capture system includes an image sensor, a bus switch, and a voltage level switch. The bus switch is interconnected between the system-on-chip and the image sensor. The bus switch has an on state where the system-on-chip is electrically connected to the image sensor and an off state where the system-on-chip is not electrically connected to the image sensor. The voltage level switch is electrically connected to the system-on-chip, and has a high voltage level state and a low voltage level state. The system-on-chip is capable of sending instructions to turn the bus switch on or off according to the state of the voltage level switch.
摘要:
A sensor system detection device for detecting quality of a sensor system includes a first connector electrically connected to the sensor system, a second connector; a display unit, a controller and an encoder. A first terminal of the encoder is connected to the first connector to receive first image data from the sensor system. A second terminal of the encoder is connected to the display unit via the second connector. A third terminal of the encoder is connected to the controller. The controller controls the encoder to transform the first image into second image data matching with the display unit. The second image data is transferred to the display unit.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A monitoring system includes a controller, a number of input devices, a number of digital sensors, a number of analog sensors, a number of displays, and a number of alarms. Each input device includes a switching circuit, an input circuit, and a connector. The connector is connected to a digital sensor or an analog sensor. The switching circuit includes an n-channel metal-oxide-semiconductor field effect transistor (MOSFET), a p-channel MOSFET, a first resistor, and a second resistor. The input circuit includes an operational amplifier and a third resistor.