Abstract: A smart key device includes a battery, a power detection module, a power indication module, and a microcontroller, wherein the battery is electrically connected to the power detection module and the microcontroller, and the microcontroller is electrically connected to the power detection module and the power indication module. The power detection module is configured to be controlled by the first control signal to detect remaining power. The power indication module is configured to be controlled by a second control signal to indicate the remaining power. The microcontroller is configured to generate the first control signal and the second control signal, wherein the second control signal includes the remaining power.

Abstract: A smart key device includes a battery, a wireless charging module, a sound output component, a distance measuring module, and a control module, wherein the wireless charging module is electrically connected to the battery, and the control module is electrically connected to the wireless charging module, the sound output component and the distance measuring module. The wireless charging module receives power and provide power to the battery. The sound output component is enabled by a first enable signal to output a sound prompt. The distance measuring module is enabled by a second enable signal to perform distance measurement. The control module includes a Bluetooth transceiver and a microcontroller, wherein the microcontroller generates the second enable signal when the Bluetooth transceiver receives a pairing signal and generates the first enable signal when determining that the measured distance is less than a preset distance.

Abstract: The present disclosure provides a server system that comprises: a CPLD comprising a first firmware and a first serial peripheral interface; and a serial peripheral read-only memory comprising a second firmware and a second serial peripheral interface; wherein the first serial peripheral interface electrically connects to the second serial peripheral interface through a serial peripheral signal. The CPLD detects the first firmware and the second firmware when the server system is booting. The CPLD sets the first firmware as a main firmware and the first firmware is used for a booting of the server system when the first firmware is detected. The CPLD sets the second firmware as the main firmware when the first firmware is not detected and the second firmware is detected. Through the technical solution of the present disclosure, the server can ensure the normal operation of the system even the CPLD firmware has a problem.