Energy-saving wireless sensors are increasingly used in the industry. Users can remotely monitor the status of the measured device and do not need to frequently replace the battery of the device. In this thesis, we studied a low-cost energy-independent wireless speed sensor system that can power itself by the rotation of the host. The BMG250 MEMS gyroscope is responsible for temperature and angular velocity measurement, and the nRF52832 SoC sends data to the remote monitoring terminal through BLE communication. This study aims to discover the energy consumption and energy saving methods of the entire process of data collection, data transfer, and data transmission. Finally, in order to meet the various test requirements, an energy consumption standard will be summed up to calculate the energy consumption of the entire system.