[graduation design] smart home system based on ZigBee - single chip microcomputer Internet of things stm32

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1 brief introduction

Hi, Hello everyone , This is senior Dan Cheng , Today, I'd like to introduce a single chip microcomputer project made by a senior

be based on zigbee Smart home system

You can use it for curriculum design or Graduation project

Single chip microcomputer - Embedded design topic selection and project sharing :

https://blog.csdn.net/m0_71572576/article/details/125409052

2 Preface

Used by senior students 6818 The development board is the gateway board of the system , It is the center of system data . Start serial transceiver , Can receive ZigBee The coordinator of the network sends data through the serial port ; lCD Screen programming , Realize the real-time display of sensor network data ; The establishment has MySQL Database connection , The temperature, humidity and door status information of the sensor network can be saved in the remote database server ; The establishment has TCP The server , Can realize the communication with the upper application ; Through serial port and NB-IOT Module connection , Realize the data forwarding of external network communication .

The perception layer of the Internet of things uses ZigBee The Internet , Realize sensor data acquisition of multiple terminal nodes , Device control of multiple terminal nodes , Unify data to be managed by coordinator ; The network layer uses Yue inlay 6818 Development board , Integration of multiple protocols , Realize data forwarding and processing ; There are WEB Terminal data display and mobile terminal light control .

2.1 System objectives

The perception layer of the Internet of things uses ZigBee The Internet , Realize sensor data acquisition of multiple terminal nodes , Device control of multiple terminal nodes , Unify data to be managed by coordinator ; The network layer USES 6818 Development board , Integration of multiple protocols , Realize data forwarding and processing ; There are WEB Terminal data display and mobile terminal light control .

3 System architecture

3.1 Gateway board design ：

The IOT gateway development board uses 6818 Development board ,GEC6818 Development platform , The core board adopts 10 Laminate process design , Make sure it's stable , It can be used for tablet computers in batches , Car engine , Learning machine ,POS machine , console , Industry monitoring and other fields .

The platform carries Samsung Cortex-A53 Series of high performance eight core processors S5P6818, The highest dominant frequency is as high as 1.4GHz, Can be applied to embedded Linux and Android Wait for the drive of the operating system 、 application development . The development board has abundant peripherals , Support for Gigabit Ethernet 、 On board LVDS Interface 、MIPI Interface 、USB Interfaces, etc. .

GEC6818 The development platform supports three major operating systems , Have complete teaching resources and teaching content , Include ：ARM Experiments driven by microprocessor system 、 Embedded real-time operating system Linux Development 、 The embedded Android System development 、 The embedded Android application development 、 Embedded system project development, etc .

GEC6818 The development board is embedded Linux System , Internal operation has TCP The server , Can wait TCP The client connects to submit data and receive control instructions ; There is a database client running inside , The sensor data reported by the sensing layer can be saved to the database server ; The board is integrated with 800*480 's display , The module status and sensor data can be displayed through the display screen ; The board is connected with the through two serial ports respectively ZigBee The coordinator of the network sensing layer 、NB-IOT Module to communicate . Achieve multi protocol Integration , Sending and receiving data 、 Handle 、 forward .

GEC6818 The development board is the data center of the system .

3.2 ZigBee Network sensing layer

The perception layer of the system uses ZigBee Network data transmission , It has a coordinator and two terminal sections . Terminal nodes realize perception and control , The sensing part includes temperature and humidity sensors 、 Hall gate sensor ; The control part is a tricolor distributed on each terminal LED The lamp .

3.3 Display control platform and data storage

The display control platform is based on the development of gateway board for users , It will need to process the data of the gateway and return it to the user for viewing and operation through simple methods such as graphics and text , Realize the rapid use of data .6818 The gateway board is connected with LCD Screen display , Realize the display of door switch status 、 Up and down line display of two terminal modules 、 Real time display of temperature and humidity .TCP Display console , It's by connecting the gateway board TCP Server implemented , You can get the data sent by the gateway , Display module status after parsing 、 Door status 、 Temperature and humidity data , The control command can also be issued through the button trigger . Data saving is to save the sensor data received by the gateway to the database in real time , The data display of the database will be displayed through the web page . The data receiving and control command sending of mobile terminal are through MQTT agreement , And the gateways realize MQTT The agreement is through NB-IOT modular .

3.4 NB-IOT Module implementation

The gateway connects with the NB Module to communicate ,NB Module through MQTT Application protocol and application layer communication , The implementation of the application layer is that the mobile phone receives the relevant sensor data and sends the light control instruction .MQTT The server is built on Tencent virtual machine .

BC26 Characteristics of ：

a phone fit all kinds of networks

Support AT Instructions

Support OpenCPU, You can save the periphery MCU

Support high-speed mobile （80km/h~120km/h）

Using the MT2625 chip

OpenCPU

1. OpenCPU It is a secondary development scheme based on the remote module , Users can develop integrated applications directly in modules , So as to eliminate the external master MCU.OpenCPU It has been widely used in M2M field , For example, smart home 、 Intelligent City 、 Asset tracking , Automotive energy and other fields .

2. OpenCPU The comparison with the traditional scheme is as follows . In the traditional scheme , Need one MCU As the main controller , Control hardware peripherals , For example, to control the lights on or off , And then use MCU Of UART Interface and standard module AT Command communication , Report the status of current street lights , Or receive the on / off command from the remote server . and OpenCPU programme , Can be directly programmed in the module to control the street lamp , Save hardware costs , Accelerate application development .

3. OpenCPU The core system is NB-IoT The combination of hardware and software of the module . It's built in ARM Cortex-M4 processor , Builds on the FreeRTOS On the operating system , With microkernel 、 The real time 、 Features such as multitasking .

Realization effect

Single chip microcomputer - Embedded design topic selection and project sharing :

https://blog.csdn.net/m0_71572576/article/details/125409052

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