[Alibaba Cloud] License plate limit number prompter

1. Product introduction:

This design is a license plate limit prompter, which mainly realizes whether the current date license plate is limited or not according to the user's license plate information and regional number limit rules. It supports mobile phone APP synchronization control, pop-up window prompts and other functions, and also supports real-time clock. ;

2. Application scenarios:

1. Prompt and alarm for license plate number limit;

2. Mobile phone APP synchronous control, number limit reminder, etc.;

3. Product overview:

This design is mainly used to realize the connection of STM32F103C8T6 + ESP8266 to the Aliyun Internet of Things platform, and to realize the function of a small number plate limit prompter, which can set license plate information, area number limit rules, system real-time date, time and other parameters on the device; The system can automatically calculate whether the license plate number is restricted on the current date according to the set license plate information and regional number restriction rules. If the number is restricted, the user will be prompted through a buzzer, and there will also be a pop-up box on the mobile APP. The specific effect See demo video.

4. Product parameters:

1. Powered by Micro USB interface, DC-5V;

2. Use ESP-12F to connect to 2.4G WIFI network;

3. Using a 1.44-inch LCD display to display system parameters in real time;

4. Support mobile APP real-time remote control, alarm prompts, etc.

[Alibaba Cloud] License plate number limit prompter hardware project Figure 1

5. Instructions for use:

1. Firstly, it is explained that the design needs to use an STM32F103 core board, and the headers on the main board can be connected to the core board. See the appendix for the purchase link of the module;

2. On the main interface of the LCD, you can view real-time time, license plate information, number restriction rules and other parameter information;

3. Use the three function buttons on the main board to switch the setting menu, realize the setting of number restriction rules, license plate information, and view of cloud server parameters;

4. At the same time, the mobile APP can support the setting of the above parameters, as well as the reminder of the limited number information, and there will be a corresponding bullet box for prompting and alarming;

5. Real-time time setting, only need to set the date and time, the system can automatically calculate the day of the week;

6. In the "variable description" in the main.c file, you need to set and compile the program according to your configured Alibaba Cloud platform and WiFi network information (as shown in the figure below);

7. When using the system for the first time, please press and hold the "K0" button + "RST" button on the STM32 core board to enter the recovery mode. By default, the compiled WiFi network information and server configuration information will be stored in EEPROM (because the new EEPROM chip does not store any information), otherwise the system will not be able to complete the initialization;

[Alibaba Cloud] License plate number limit prompter hardware project Figure 2

6. Remarks:

1. There is program source code (source_code.zip) in the attached file, and detailed notes have been added to the key parts of the source code;

2. The mobile APP uses the configuration scheme of the Alibaba Cloud platform (the cloud smart APP is compatible with Android and IOS). For the specific configuration method, you can find relevant tutorials at station B;

3. The hardware part of this project is relatively simple, and the main difficulty lies in the program software part. The source code has been provided to everyone, and everyone is welcome to optimize and iterate on this basis;

4. For connecting to the WiFi network, accessing the Alibaba Cloud server, and parsing JSON data, only the API interface is temporarily provided (API.lib, you can transplant it to your own design, and complete the configuration through the API interface provided by MQTT.h and WiFi.h in the product. );

5. The program source code source_code.zip provided in the attachment is the STM32 project file in the keil v5 development environment, which can be compiled, debugged, and burned in keil v5. It is recommended to use emulators such as Jlink and ST-link to burn the program recording debugging;