Highlights of the plan 1. The smart screw locking system for wireless transmission proposes a power consumption improvement mechanism. When using a 50mAH lithium battery, the number of reports can be >3500 times, and the estimated use time is more than 8 months. 2. Reduce the size of the sensor, I hope it can be applied to screws below M12 size. 3. Compared with specifications such as zigbee and bluetooth, it can effectively reduce the amount of data, and can save more power and longer transmission distance.The ARM451 Cortex®-M4 core with working voltage can be 2.5V ~ 5.5V, industrial temperature (-40 ℃ ~ 105 ℃), built-in 22.1184 MHz crystal oscillator, configurable Data Flash, strong anti-interference (ESD 8 kV), this series of products are built-in The core of the Digital Signal Processor (DSP) and Floating Point Unit (FPU), with high computing performance, system clock up to 72 MHz. And built-in 12-bit analog-to-digital converter (ADC) with up to 16 channels, and a 12-bit digital-to-analog converter (DAC), can directly handle the strain gauge in the sleeve (strain gauge) The torque analog data obtained by the sense can also be fed back to the front end through the built-in DAC after arithmetic processing to effectively control and correct some non-ideal effects.This research can sense the state of torque clamping force, loosening, sequence, etc. through the screw sensor sleeve, and through the non-standard protocol radio frequency (proprietary) 2.4GHz RF and torque control gateway connection, so that the mechanical equipment has real-time monitoring, failure Intelligent functions such as prediction, precision compensation, automatic parameter setting, data accumulation, and big data analysis enable the information of each locked screw to be recorded in the cloud database in detail.