A multi-channel ultrasonic wave sensor distance measurement control system is researched and fabricated with STM32 microcontroller unit（ MCU） as control core

using RS—485 BUS and the central control board networking. This design integrates ranging information of each node about distances measured by multichannel ultrasonic circuits and the central board upload the message to the main control core

which measures all obstacles. The hardware circuit

operating principle

software design idea

communication protocols

error control and related practical applications are proposed. Compared with the traditional ultrasonic distance measurement

using the measurement system in robot or smart car obstacle avoidance system

simplifies software and the save control hardware resources.