Design and application of ARM and MEMS devices in micro inertial measurement devices

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Summary:

In the study of biomimetic propulsion mechanism, accurate measurement of fish caudal fin flapping parameters is of great significance for the study of fish bionic propulsion mechanism and engineering application; however, most researchers currently use the images obtained by analyzing high-speed cameras to obtain parameters. This method is limited by the environment and equipment, and the result is less accurate. This design is a biological motion micro inertial measurement device based on MEMS devices. The device is used to accurately measure the flapping parameters of the fishtail fin of the SPC-III machine, which lays a foundation for the first measurement of the living fish fin finping parameters of the MEMS device in China, and provides support for the robotic bionic propulsion design theory.

Design requirements and system structure

According to the biological characteristics of living fish and the characteristics of the experiment itself, the micro-inertial measurement device should meet the following design requirements: small size, light weight, low power consumption, high acquisition frequency and acquisition accuracy, and good waterproof sealing performance. In order to achieve these requirements, the hardware of the micro inertial measurement device consists of two parts: 1 microprocessor unit; 2 micro inertial sensor unit. The microprocessor unit mainly includes a microprocessor, an A/D conversion chip, and a flash. As the core unit, the microprocessor connects to the A/D conversion chip through the SPIl port to complete data acquisition, connects to the flash through the SPIO port to complete data storage, and communicates with the host computer through the serial port. The micro-inertial sensor unit is composed of a MEMS accelerometer and a MEMS gyro, and performs the original information acquisition task of acceleration and angular velocity. The collected original information is processed by A/D conversion, written into the Flash chip, or sent directly to the host computer for processing through the serial port. The schematic diagram of the system is shown in Figure 1.