Circuit structure of ultrasonic parking place detector

The invention relates to a circuit structure of an ultrasonic parking place detector. The circuit structure is connected with a single-chip microcomputer through the input end of an ultrasonic driving circuit, an ultrasonic sensor is connected with the input end of a received signal amplification and detection circuit, the output end of the received signal amplification and detection circuit is connected to the single-chip microcomputer, the gain control end is connected to a single-chip microcomputer port through an output expander, an oscillating circuit and a watchdog circuit are respectively connected with corresponding ports of the single-chip microcomputer, a transistor-transistor logic (TTL) serial communication port of an RS-422 communication circuit chip is connected with a communication port of the single-chip microcomputer, the input end of a power circuit is connected with external 24V direct current, a driving indicating circuit is connected with the single-chip microcomputer port through the output expander, and an input expander is used for connecting a dial switch so as to set up parameters and input the parameters to the single-chip microcomputer. The circuit structure of the ultrasonic parking place detector enables a parking place guide system to guide vehicles automatically to enter empty parking places rapidly, reduces cost of managers, eliminates troubles for searching parking places, saves time, and enables images of parking lots to be perfect.