The Design of Ultrasonic Distance Measurement System Based of SOPC

In this article, the hardware´s structure, the interface circuit, and the application software of the ultrasonic distance measurement system based of SOPC (System On a Programmable Chip) were studied. FPGA (Field Programmable Gate Array) was used as the core chip to design the hardware that processed the signal of ultrasonic sensor. The driver signal for ultrasonic emitter and the counter module were programmed by VHDL (Very-High-Speed Integrated Circuit Hardware Description Language), and C programming language was used to develop application software that converted the counter´s value to distance and displayed the results of measurement on LCD in the Nios II integrated development environment. When the distance was less than safety value, the buzzer would alarm. The system can be applied to the collision avoidance control system on vehicle.