Development Of FDM-ERT Measurement And Control System Based On IoT

FDM-ERT method sent multiple frequencies of current at different power supply points,which improved work efficiency and antiinterference ability,which has broad application prospects in urban geophysical observation.In order to meet the characteristics of real-time,portable and intelligent FDM-ERT instrument,this design integrates Bluetooth,Wi Fi,NB-IoT and other IoT technologies.A FDM-ERT measurement and control system based on IoT is designed,which is composed of Android software,cloud platform and embedded system.This design includes two modes of near field communication(NFC)and cloud communication.In NFC,the Android terminal software uses Bluetooth to send control commands to the embedded terminal,and Wi Fi receives original data.In cloud communication,the Android software functions as the application side of the cloud platform to deliver commands and pull data,while the embedded system functions as the device side to receive commands and report data.As the control terminal of the system,the Android software is responsible for the direct interaction with the user.The Android software mainly realizes the functions of parameter setting,acquisition and control,data transmission,data calculation and visualization,and completes the user’s operation instructions through the control and communication of the embedded system or cloud platform.The cloud platform is mainly responsible for product model development and data flow.As a transfer station for system control and data,the embedded end selects STM32 series microcontrollers,integrates Bluetooth module,Wi Fi module and NB-IoT module,and is equipped with UCOS-III operating system to complete command parsing and data uploading functions.In the end,this paper conducted a comprehensive test on each part of the system,and conducted a joint test with the FDM-ERT acquisition system.The test results show that the system has good functionality,and the instrument can be controlled intelligently through mobile phones to achieve short-range communication and cloud communication.The data transmission quality is good and the system runs stably.The calculated results accord with the characteristics of the method.