【得捷电子Follow me第3期】+任务4：连接WiFi网络

EPTmachine · 发表于2023-12-16 23:55

【得捷电子Follow me第3期】+任务4：连接WiFi网络 [复制链接]

ESP32C3支持Wifi功能，可以连接互联网，从网上获取信息，比如网络时间信息。

## 连接网络
参考官方提供的代码，填入自己的wifi名称和密码，即可实现联网。
```python
import network
import urequests
import utime as time

# Network settings
wifi_ssid = "user_wifi"
wifi_password = "user_passwd"

def scan_and_connect():
  station = network.WLAN(network.STA_IF)
  station.active(True)

print("Scanning for WiFi networks, please wait...")
  for ssid, bssid, channel, RSSI, authmode, hidden in station.scan():
  print("* {:s}".format(ssid))
  print(" - Channel: {}".format(channel))
  print(" - RSSI: {}".format(RSSI))
  print(" - BSSID: {:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}".format(*bssid))
  print()

while not station.isconnected():
  print("Connecting...")
  station.connect(wifi_ssid, wifi_password)
  time.sleep(10)

print("Connected!")
  print("My IP Address:", station.ifconfig()[0])

# Execute the functions
scan_and_connect()

```
串口输出的结果如下：
```log
Scanning for WiFi networks, please wait...

.....

Connected!
My IP Address: 192.168.170.168
```

## 获取网络时间并显示
网络时间的获取是通过向网络时间服务器发起请求，在返回的json字符串中提取相关的信息，配合之前实现的ssd1306显示功能，从而实现获取网络时间并显示的功能。

代码如下

```python
from machine import Pin, SoftI2C
import ssd1306
from time import sleep
import time
import network
import urequests
import ujson

# ESP32 Pin assignment
# i2c = SoftI2C(scl=Pin(22), sda=Pin(21))

# ESP32C3 Pin assignment
i2c = SoftI2C(scl=Pin(7), sda=Pin(6))# Adjust the Pin numbers based on your connections

oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

station = network.WLAN(network.STA_IF)
station.active(True)

# Network settings
wifi_ssid = "user_wifi"
wifi_password = "user_passwd"
url = "http://worldtimeapi.org/api/timezone/America/New_York"

print("Scanning for WiFi networks, please wait...")
authmodes = ['Open', 'WEP', 'WPA-PSK' 'WPA2-PSK4', 'WPA/WPA2-PSK']
for (ssid, bssid, channel, RSSI, authmode, hidden) in station.scan():
  print("* {:s}".format(ssid))
  print(" - Channel: {}".format(channel))
  print(" - RSSI: {}".format(RSSI))
  print(" - BSSID: {:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}".format(*bssid))
  print()

# Continually try to connect to WiFi access point
while not station.isconnected():
  # Try to connect to WiFi access point
  print("Connecting...")
  station.connect(wifi_ssid, wifi_password)
  time.sleep(10)

# Display connection details
print("Connected!")
print("My IP Address:", station.ifconfig()[0])

while True:
  # Perform HTTP GET request on a non-SSL web
  response = urequests.get(url)
  # Check if the request was successful
  if response.status_code == 200:
  # Parse the JSON response
  data = ujson.loads(response.text)
  # Extract the "datetime" field for New York
  ny_datetime = data["datetime"]
  # Split the date and time components
  date_part, time_part = ny_datetime.split("T")
  # Get only the first two decimal places of the time
  time_part = time_part[:8]
  # Get the timezone
  timezone = data["timezone"]
  
  # Clear the OLED display
  oled.fill(0)
  
  # Display the New York date and time on separate lines
  oled.text("New York Date:", 0, 0)
  oled.text(date_part, 0, 10)
  oled.text("New York Time:", 0, 20)
  oled.text(time_part, 0, 30)
  oled.text("Timezone:", 0, 40)
  oled.text(timezone, 0, 50)
  # Update the display
  oled.show()
  else:
  oled.text("Failed to get the time for New York!")
  # Update the display
  oled.show()

```

显示效果如图

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## 总结
wifi功能给了开发者获取外部信息的方式，使嵌入式设备接入网络，实现贴近实际的应用。