物联网智能家居，电路图设计，及个部分源代码-Things smart home, schematic design, and a part of the source code

Student walk through attendance system : RFID tag is being captured from a long range 125KHz RFID reader using NodeMCU (an ESP8266 based development board). The captured tag is being uploaded into the database server via WiFi internet connection. C

NB-IOT模块M5311发送数据到服务器，本代码为C代码，基于STM32F1系列单片机，工程为keil5工程，可以此为模板修改。(Nb-iot module m5311 sends data to the server, this code is C code, based on stm32f1 series single chip microcomputer, the project is keil5 project, which can be modified as a template.