Abstract: A car wash includes a supporting mechanism and a washing mechanism. The supporting mechanism includes a fixed base and a supporting disc rotatably mounted to the fixed base. The supporting disc can be stopped in any orientation relative to the fixed base, providing an orientation-variable entrance/exit. The supporting disc includes a top side for supporting a car to be washed by the washing mechanism.

Abstract: An improved micro-controller with a built-in test circuit is disclosed.

Abstract: A flag setting circuit for a microcontroller, which can be set with a HALT mode flag and a watchdog timer overflow flag by using a system power-on signal, an external reset signal, a watchdog timer overflow signal inside the microcontroller, a clear instruction for watchdog timer, a HALT mode instruction, and a wake-up signal. The setting circuit for the watchdog timer overflow flag includes a reset signal generator, a watchdog timer, a clear signal generator, a flag clear circuit, and a register circuit. The setting circuit for the HALT mode flag includes a HALT mode discerning circuit, a flag clear circuit, and a register circuit. The frequency source of the watchdog timer is provided by means of a frequency from the system oscillator divided with four, or by using a frequency of RC oscillator built in the system. Under the HALT mode, the RC oscillator is selected. By means of the HALT mode flag and the watchdog timer overflow flag, the operation condition of the system hardware can be discerned.

Abstract: A fallproof safety parking apparatus including a main body having a transverse beam and a lateral beam on which a detector and a detecting means are respectively disposed beside driving chains. The detector has a resilient pressing rod and the detecting means has a resilient pressing post for abutting against the chains without affecting the operation thereof. In case any section of the chains is broken apart, the resilient pressing rod of the detector or the resilient pressing post of the detecting means immediately bounds out from the broken section of the chains to actuate a microswitch of the detector or detecting means, making a fallproof means powered off. At this time, a brake block of the fallproof means is inserted into an insertion hole of a fixing lever of the main body and locked therein so as to instantaneously prevent an upper parking platform from straightly falling down. Two pairs of steel cables are disposed on the beams of the main body to help in holding the upper parking platform.