Abstract: The wearable motion monitoring system can easily realize the motion posture detection and motion function evaluation of the human body. The system uses a highly integrated inertial sensor and short-range wireless communication technology to construct a somatosensory network, synchronously collect acceleration and angular velocity signals of multiple parts of the human body, and realize wearable multi-node motion monitoring. The system can be applied to studies related to human motor function, such as Parkinson's motor function assessment. introduction This paper designed a wearable motion monitoring system with five sensor nodes. By placing the sensor node on the subject's feet, wrists, and waist, motion signals such as acceleration and angular velocity during body motion are acquired. Thereafter, the collected signals are uploaded to the host computer for data analysis, and the motion parameters related to the motion function, such as gait and balance ability, are calculated. The system has a wide range of applications, for example, it can be used for disease assessment and monitoring of dyskinesia diseases, such as Parkinson's disease, stroke and other diseases; it can be used for athletes' motion analysis and scientifically guiding athletes' training. 1 System plan overview The system consists of a PC, a gateway node and five terminal nodes (see Figure 1). The gateway node is connected to the PC through the USB port, and uses the serial communication protocol to perform command and data communication with the host computer; and performs command and data communication with each terminal node through short-range wireless communication. Terminal node: responsible for data collection, storage and upload. It is fixed to a specific part of the human body by a bandage. In the standby mode, each node is in the wireless receiving state, waiting to receive the broadcast command of the gateway node, and realizing synchronous acquisition and storage of data. The user issues a command through the PC software, and the system runs according to the command. After the data collection is completed, the PC sends a data upload command, so that the gateway node sequentially transmits the data to the upper computer and saves it by means of point-to-point polling. This paper mainly introduces the design of the wearable system composed of the gateway node and the terminal node. 2 hardware design 2.1 Terminal node design The terminal node adopts TI's ultra-low-power single-chip MSP430F149 as the main control unit. The MPU6050 six-axis inertial sensor is used to detect the acceleration and angular velocity signals. Nordic's NRF24L01 is used as the wireless communication module to achieve an effective communication distance of 30 meters. It is powered by a 3.7V lithium battery and has a system operating voltage of 3.0V after being regulated by a regulator (see Figure 2). The details of the core module are as follows. (1) The main control module uses MSP430F149 as the control center, which is responsible for the coordination and control of the functions of all parts of the whole system. In addition to its ultra-low operating current of about 300μA when operating at 8MHz clock, it also provides two timers A and B, two UART and SPI multiplexed asynchronous serial communication interfaces, and 48 I/O ports. Fully meet the system's requirements for interface resources. In addition, MSP430F149's 60KB on-chip Flash and 2KB SRAM fully meet the space requirements of the system for program storage and data exchange. (2) Power module, the gateway node is powered by 5.0V USB port, and converted to 3.3V by TLV70033 low-dropout linear regulator for system use. The terminal node is powered by a 3.7V lithium battery, regulated by the TLV70030, and converted to 3.0V for system use. (3) The sensor module adopts MPU6050 six-axis inertial sensor, which has the outstanding advantage of integrating the three-axis accelerometer and the three-axis gyroscope, which not only eliminates the problem of the inter-axis difference between the two, but also greatly reduces the packaging space and is portable. Or wearable devices provide a minimum package size. (4) The memory module uses W25Q256 high-speed flash, which can store about 15.5 hours of data continuously under the sampling rate of 50Hz. (5) The wireless communication module adopts NRF24L01 wireless communication chip, the communication speed of up to 2Mbps, communication distance of 30 meters, six receiving channels and SPI interface, which is very convenient for system development. 2.2 Gateway node design The gateway node is mainly composed of four parts: a power module, an MCU main control module, a wireless communication module, and a serial communication module. The power module, the main control module, and the wireless communication module are the same as the core chip of the terminal node, and the hardware principles are the same, and will not be described again. The serial communication module uses PL2303 to convert the serial port data into USB data to realize communication with the PC. The gateway node is powered by a 5.0 volt USB port, and the system voltage is 3.3V after being regulated by the regulator. 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