[Digi-Key Follow me Issue 1] Network configuration and NTP network time synchronization via WeChat applet
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1. Project description (about 800 words, pay attention to neat format)
The Raspberry Pi Pico W development board used in this event has wireless network function. In MicroPython, you can easily connect to the wireless hotspot through the network module by setting the SSID name and password to be connected.
During the development and debugging phase, you can simply write the ssid and password into the code.
However, in actual use, different wireless networks may be involved. If we need to modify the code every time to implement it, then our program will not be universal.
Wireless network configuration for embedded devices, common ones include SmartConfig, AirKiss, etc., and there are also solutions for transmitting connection information through UDP services.
After understanding, someone has realized the WeChat applet network configuration function on ESP8266/ESP32, which can be seen: .
After reading the network distribution function in detail, we transplanted and improved it according to the actual situation of the Pico W development board, and finally formed this project.
This project uses the WeChat applet to configure the network for the Pico W development board, thereby achieving quick and convenient wireless connection information settings.
The main process of network distribution is as follows:
1. After the Pico W development board is started, first check whether there is any connection information of the last successful configuration
2. If yes, use the last connection information to connect to the wireless hotspot; if the connection fails, start a new round of network configuration process
3. If not, start a new round of network configuration process
4. After the wireless hotspot is successfully connected, NTP synchronization will be automatically started to calibrate the time
The network configuration process is as follows:
1. Set the wireless network card of PCIO W to AP mode and provide a hotspot to the outside world
2. After turning on AP mode, start the UDP service, wait for the mobile phone to connect and send connection information
3. Scan the QR code on your mobile phone to enter the network configuration interface
2. Main code snippets and descriptions corresponding to each function
2.1 Network initialization code:
This part of the code mainly initializes the network configuration instance class and the configuration file.
Connection information, saved in the mpyconnect/config.json file
2.2 Configuration reading and writing of connection information:
Connection information, saved in json format
2.3 Creating a wireless hotspot
This section creates a wireless hotspot for mobile phones to connect to.
2.4 Creation of UDP service and reception of information:
The original udp service is in blocking mode, which is changed to asyncio mode here
2.5 Connect the development board to the wireless router
This section is about connecting to the hotspot of the wireless router and how to handle disconnection.
2.6 NTP time synchronization
NTP time synchronization processing, where UTC_OFFSET = 8 * 60 * 60, indicating GMT+8 time zone
2.7 Main process of wireless network configuration:
This section is the main process of wireless network configuration. If the connection is successful, the information will be saved for use after the next restart. Otherwise, the network configuration process will be entered.
3. Function display and description (with pictures and text)
3.1 Pico W runs the network configuration program
3.2. Scan the QR code with your mobile phone to enter the network configuration interface of the WeChat applet:
3.3 Connect your phone to MpyConnect
3.4 On the wireless network configuration interface, click Start configuration:
3.5 Pico W receives the configuration information and starts the network configuration process:
3.6 After the configuration is successful, you can restart the device and run it again. The last configuration will be automatically used.
4. Your experience of this activity (including opinions or suggestions)
Thanks to the power of Pico W and the perfection of micropython, all functions were successfully completed.
In the future, we can consider dividing the tasks into simple and challenging ones to make everyone more motivated.
5. Complete code
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