Design And Implementation Of Wireless Transmission System For Textile Based Flexible Pressure Sensor

In recent years,due to the rapid development of artificial intelligence and automation technology,people's demand for intelligent wearable electronic products is increasing,and it has become one of the current research hotspots.smart sensing textiles are an important part of wearable textiles,In the application of intelligent textiles,flexible pressure sensors with high sensitivity is fabricated and seamless integration with textiles that is one of the most important factors,so the flexible pressure sensor is prepared by using polymer assemblies with different structures as the substrate.Textile materials have been widely used because of their unique textile structure,excellent elasticity,skin-friendly properties and seamless connection with clothing.It is supposed to be the most perfect material for fabricating flexible pressure sensors.First of all,the material of two-dimensional textile structure has a small contact area with human body and objects,In the case of large compression deformation,it is difficult to meet the requirements of sensing.Therefore,textile fabrics with complex structure,large compression and large contact area with human skin are selected to prepare flexible pressure sensors,Thus,the sensing performance of the device is effectively improved.Secondly,considering the large volume of traditional detection equipment,it can not realize the function of human body wearability.Therefore,it has become a difficult problem to select the appropriate detection equipment for the detection of sensor signals.So we need to develop a small detection device,It can not only monitor human signals in an all-round way,but also solve the problem of human body wearability.In this paper,three-dimensional spacer fabric and polyurethane sponge are selected as flexible substrate,graphene solution as an electrically active material,Two kinds of flexible pressure sensors with textile structure were prepared respectively.By combining the two sensors into an array,The sensor controller is developed by combining the sensing characteristics of the them.The performance of two kinds of pressure sensors with different textile structures is studied.analyzing the applications in human wearables and resolution recognition of static objects.The specific research contents are as follows:1.Low cost and commercial three-dimensional knitted spacer fabric is used as the flexible substrate of pressure sensor,Graphene solution act as the active material,the three-dimensional spacer fabric flexible pressure sensor was prepared by soaking method.The spacer fabric has good elasticity and flexibility,The inner coated polyester filament that has strong durability and corrosion resistance,It is a good substrate for fabricating flexible pressure sensors.The three-dimensional fabric flexible pressure sensor has good repeatability,durability and mechanical stability.Thus the flexible pressure sensor array with three-dimensional knitting structure is assembled,Meanwhile,a pressure sensor controller is developed.The sensor array,computer,controller and mobile phone Bluetooth are combined to form electronic intelligent textiles,among them,the controller uses the STM32F103C8T6 MCU as the main unit,connects peripherals and combines bluetooth to realize data collection and wireless transmission.The whole system has unique advantages and broad prospects in weight recognition and human static test.2.In order to make up for the low elasticity of 3D fabric,the sponge with complex porous structure was selected as the flexible substrate.A certain concentration of graphene solution acts as active material.The flexible pressure sensor with high elasticity was prepared.Due to the inherent resilience and comfort of the sponge,The sensor has excellent sensing performance.The flexible pressure sensor array with three-dimensional porous structure is assembled,Connected the controller and combine it into a wireless transmission system to further explore its applications.3.The wireless transmission systems of the two kinds of flexible pressure sensors with textile structure are connected to different parts of the human body to detect human physiological activity signals.Such as walking,running,squatting hand and human static motion recognition,etc.,at the same time,the pressure sensor can distinguish the pressure distribution of static objects.In addition,the whole wireless transmission system can distinguish the touch position and identify the size of the contact force.