Embedded Files
(2022/12/11)
Raspberry Pi Pico W 式款低成本且高靈活應用的 RP2040 開發平台，此外還有2.4GHz 無線接口和以下主要功能：
內建 2MB 外部閃存的 RP2040 微控制器晶片
2.4GHz 無線 (802.11n) 介開發板載
用於電源、數據與對閃存重新編程的微型 USB 接口
帶有 0.1 英寸通孔針的 40 針 21mm×51mm 'DIP' 型 1mm 厚的邊緣齒型 PCB
外露 26 個多功能 3.3V 通用 I/O (GPIO)
有 23 個僅適用於數字與另外 3 個支援 ADC 的 GPIO
可作為模組進行表面貼裝
Raspberry Pi Pico W 的完整詳細訊息可在 Raspberry Pi Pico W 數據表 中找到
連結至無線網路
程式
import network
import time
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('cc1', '075565940')
while not wlan.isconnected() and wlan.status() >= 0:
print("Waiting to connect:")
time.sleep(1)
print(wlan.ifconfig())
雖然上述代碼正確，但您應該還是要等待代碼連接成功或連接失敗，然後處理任何連接可能發生的錯誤。
import time
import network
ssid = 'cc1'
password = '075565940'
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)
# Wait for connect or fail
max_wait = 10
while max_wait > 0:
if wlan.status() < 0 or wlan.status() >= 3:
break
max_wait -= 1
print('waiting for connection...')
time.sleep(1)
# Handle connection error
if wlan.status() != 3:
raise RuntimeError('network connection failed')
else:
print('connected')
status = wlan.ifconfig()
print( 'ip = ' + status[0] )
有關 network.WLAN庫的更多訊息，請參閱 庫文檔。
發出 HTTP 請求
您可以使用原始套接字對 HTTP 請求採用低級方法
搭配 sockets 的 HTTP
# Connect to network
import network
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('Wireless Network', 'The Password')
# Should be connected and have an IP address
wlan.status() # 3 == success
wlan.ifconfig()
# Get IP address for google
import socket
ai = socket.getaddrinfo("google.com", 80)
addr = ai[0][-1]
# Create a socket and make a HTTP request
s = socket.socket()
s.connect(addr)
s.send(b"GET / HTTP/1.0\r\n\r\n")
# Print the response
print(s.recv(512))
也可以使用 urequests 庫採用高級方法。
搭配 urequests 的 HTTP
# Connect to network
import network
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('Wireless Network', 'The Password')
# Make GET request
import urequests
r = urequests.get("http://www.google.com")
print(r.content)
r.close()
利用網頁來控制內建LED燈的亮滅
掃描WiFi
import network
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
print(wlan.scan())
建一個secrets.py來存WIFI的SSID及密碼
secrets = {
'ssid': 'Replace-this-with-your-Wi-Fi-Name',
'pw': 'Replace-this-with-your-Wi-Fi-Password'
}
主要程式(main,py)
import rp2
import network
import ubinascii
import machine
import urequests as requests
import time
from secrets import secrets
import socket
# Set country to avoid possible errors
rp2.country('DE')
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
# If you need to disable powersaving mode
# wlan.config(pm = 0xa11140)
# See the MAC address in the wireless chip OTP
mac = ubinascii.hexlify(network.WLAN().config('mac'),':').decode()
print('mac = ' + mac)
# Other things to query
# print(wlan.config('channel'))
# print(wlan.config('essid'))
# print(wlan.config('txpower'))
# Load login data from different file for safety reasons
ssid = secrets['ssid']
pw = secrets['pw']
wlan.connect(ssid, pw)
# Wait for connection with 10 second timeout
timeout = 10
while timeout > 0:
if wlan.status() < 0 or wlan.status() >= 3:
break
timeout -= 1
print('Waiting for connection...')
time.sleep(1)
# Define blinking function for onboard LED to indicate error codes
def blink_onboard_led(num_blinks):
led = machine.Pin('LED', machine.Pin.OUT)
for i in range(num_blinks):
led.on()
time.sleep(.2)
led.off()
time.sleep(.2)
# Handle connection error
# Error meanings
# 0 Link Down
# 1 Link Join
# 2 Link NoIp
# 3 Link Up
# -1 Link Fail
# -2 Link NoNet
# -3 Link BadAuth
wlan_status = wlan.status()
blink_onboard_led(wlan_status)
if wlan_status != 3:
raise RuntimeError('Wi-Fi connection failed')
else:
print('Connected')
status = wlan.ifconfig()
print('ip = ' + status[0])
# Function to load in html page
def get_html(html_name):
with open(html_name, 'r') as file:
html = file.read()
return html
# HTTP server with socket
addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
s = socket.socket()
s.bind(addr)
s.listen(1)
print('Listening on', addr)
led = machine.Pin('LED', machine.Pin.OUT)
# Listen for connections
while True:
try:
cl, addr = s.accept()
print('Client connected from', addr)
r = cl.recv(1024)
# print(r)
r = str(r)
led_on = r.find('?led=on')
led_off = r.find('?led=off')
print('led_on = ', led_on)
print('led_off = ', led_off)
if led_on > -1:
print('LED ON')
led.value(1)
if led_off > -1:
print('LED OFF')
led.value(0)
response = get_html('index.html')
cl.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
cl.send(response)
cl.close()
except OSError as e:
cl.close()
print('Connection closed')
# Make GET request
#request = requests.get('http://www.google.com')
#print(request.content)
#request.close()
index.html
<!DOCTYPE html>
<html>
<head>
<title>Pico W</title>
</head>
<body>
<h1>Pico W</h1>
<p>Control the onboard LED</p>
<a href=\"?led=on\"><button>ON</button></a>
<a href=\"?led=off\"><button>OFF</button></a>
</body>
</html>
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