Development Of A Wearable Sweat Multi-parameter Electrochemical Sensor Monitoring System Based On Bluetoot

A wearable wireless electrochemical detection system with multiple parameters was designed and developed in response to the need for wearable,high-precision,long-term detection in the field of sweat detection during exercise.The hardware circuit of the system is composed of a low-power amplifier core micro-Potentiostat circuit and an open circuit potential acquisition circuit using the ADA4505-2 micropower amplifier,a low noise 24-bit Σ-Δ type ADC(AD7124-4)as the conversion circuit,a dual-channel 12-bit DAC(AD5623)as the reference voltage source and control potential generator,and a low-power Bluetooth(BLE)chip CC2640R2 F as the main controller,with ADP1711AUJZ-3.3-R7 and TPS79933 DDCT chips used respectively as front-end analog circuit,conversion circuit,and main controller circuit power supply.With a 370 m Ah lithium battery,it can work continuously for more than 5 hours,meeting the monitoring time requirements.The system has the synchronous detection capability of three channels of potential and two channels of current,and can simultaneously achieve the monitoring of up to 5 different substances concentrations.In order to verify the reliability and accuracy of the system,the potential monitoring and current monitoring abilities were tested using external signal sources,and the test results showed that the voltage resolution reached1μV and the current resolution reached 1n A.The improved flexible monitoring device can monitor the concentration of 6 different sweat electrolytes,and the monitoring system can be worn on the wrist,leg,head,and other positions.Based on the basic principles of electrochemistry,this paper designed and produced glassy carbon electrodes and flexible ISE sensors based on screen printing technology to verify the feasibility of detecting multiple parameters of sweat materials.Ion-selective electrodes were used for potassium ion concentration gradient testing and current-type sensors were used for uric acid concentration gradient testing,and the test results were compared with those of laboratory desktop electrochemical analyzers to verify the detection ability of this monitoring system for changes in sweat substance concentrations.Using a self-made flexible ISE sensor based on PET material combined with this system,the concentration changes of multi-channel artificial sweat ions and the pH changes in sweat during human exercise were monitored in realtime,and the experimental results met the expected requirements,verifying the feasibility of the practical monitoring application of this system.Based on Android Studio,an intelligent mobile device application program was developed to communicate with the hardware circuit,realizing multiple functions such as Bluetooth connection,disconnection,data transmission,data display,image display,and data storage,and realizing real-time monitoring of multiple channels data in the form of scatter plots.In summary,this research provides a multi-parameter sweat monitoring device suitable for exercise scenarios,which can real-time monitor changes in sweat substance concentrations of the human body during exercise and has good prospects for monitoring physiological loads of athletes during training.