Smart grid home electricity monitoring system based on MIPS32 design

I. Research background and significance

With the introduction of the smart grid concept, energy metering and marketing solutions based on home smart interactive terminals have gradually formed, which means that home control will move towards intelligence. Smart home is a new type of home that has been produced and rapidly emerged in recent years. The intelligentization of home provides residents with a safer, more comfortable, convenient, fast and open intelligent and informational living space. Convenient for the user. Therefore, the establishment of a home control system with family interactive terminals as the core is of great significance to the transformation and implementation of smart grids.

However, the current home intelligent system has a big limitation, that is, it only achieves partial intelligence. In the true sense of home intelligence, it should have a centralized terminal control system, through which the intelligent control and monitoring of all the devices in the home will be the future development direction of the smart home system .

This design uses MIPS' 32-bit processor as the core to build an intelligent display terminal, and uses a smart socket with wireless communication as the controlled node to build a simple smart home control system . The system can be controlled by remote (mobile phone text message) and local (smart display terminal). The following is an analysis of the composition and implementation of the system, as well as the key issues involved in each module.

2. The composition and working principle of the system

1 System structure and principle

The system consists of a mobile phone, an intelligent display terminal, and a smart socket. The mobile phone communicates with the intelligent display terminal through the GSM module, and the Zigbee is used for communication between the intelligent display terminal and the smart socket.

As a basic control unit, the smart socket can collect the electricity usage information of each room in real time and transmit the information to the intelligent display terminal in real time. When a power abnormality is found, the smart socket automatically powers off and sends the execution result to the smart display terminal. The intelligent display terminal also sends this result to the user's mobile phone.

The mobile phone realizes remote control and information reception of the user. When the user goes out, the commands sent by the mobile phone (such as pre-boot, pre-shutdown, time-limited power supply, etc.) will be received by the smart terminal and delivered to the smart socket. In addition, all execution actions of the smart socket will be sent to the mobile phone through the smart display terminal.

The intelligent display terminal can receive the commands sent by the mobile phone as well as the data sent by the smart socket. After the smart display terminal accepts the data uploaded by the smart socket, the data will be stored. When the user starts the query function, the intelligent display terminal will call the data and perform analysis and calculation to display various types of power consumption information.

2 Function introduction

1 Real-time power monitoring

2 Pre-start and pre-shutdown of the appliance

3 limited time power supply

4 limited power supply

5 temperature monitoring

6 fault alarm

7 SMS remote control

8 local touch screen manipulation

9 various types of query functions. Including monthly electricity, daily electricity, electricity during the period, accumulated electricity at any time, and the electricity consumption of any single appliance.

10 user-friendly touch screen operation and voice output

Project technical plan

1 system composition

The system equipment is mainly composed of three parts: mobile phone, intelligent display terminal, and smart socket. As shown in Figure 1.1.

Smart grid home electricity monitoring system based on MIPS32 design

1.1 System Structure

The system equipment is mainly composed of three parts: mobile phone, intelligent display terminal, and smart socket.

According to whether the head of the household is at home, two ways are designed for control.

1 SMS message. This method is mainly designed for the situation where the head of the household is on a business trip, which is convenient for remote control. The mobile phone can send a command to the smart display terminal, and after receiving the command, the smart display terminal decodes the command and sends a command to each smart socket. After receiving the control command, the smart socket performs the corresponding operation, and feeds back the execution result to the intelligent display terminal, and the smart display terminal sends the received information to the mobile phone.

2 local touch screen. This approach is designed for the situation of the head of the household. The owner can directly complete the corresponding operation on the touch screen and control according to the interface prompts.

The intelligent display terminal and the mobile phone communicate through the GSM module, and the intelligent display terminal and the smart socket communicate with each other through Zigbee.

The system block diagram is shown in Figure 1.2:

Smart grid home electricity monitoring system based on MIPS32 design

Figure 1.2 Overall system block diagram

1.2 Functional Description

1 Through the system, real-time monitoring of home appliances, timed start, limited power supply and other important functions can be realized, and the electrical equipment in each room can be easily managed.

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