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本文來源電子發燒友社區，作者：華仔stm32，帖子地址：https://bbs.elecfans.com/jishu_2284182_1_1.html

【目的】展示ESP32作為web服務器的，用ESP32C3寫一個websocket服務器，用網頁來實現控制板載LED燈亮度的例子。
【實現思路】1、ESP32建立webserver。2、書寫一個ajax的網頁。3、配置LED燈的pwm。
1、打開uPyCraft 軟件，建立一個esp32c3.html:

<title>ajaxWebCtrl
ESP32 PYTHON TEST
PWM LED --- Web Control for FireBeetle

復制代碼

2、新建esp32webpwmCtrl.py

from machine import Pin,PWM
import network
import os
import time
import socket
import gc
SSID="HUAWEI-H10R9U"
PASSWORD="18977381885@"
wlan=None
s=None
led=None
def connectWifi(ssid,passwd):
global wlan
wlan=network.WLAN(network.STA_IF) #create a wlan object
wlan.active(True) #Activate the network interface
wlan.disconnect() #Disconnect the last connected WiFi
wlan.connect(ssid,passwd) #connect wifi
while(wlan.ifconfig()[0]=='0.0.0.0'):
time.sleep(1)
print(wlan.ifconfig()[0])
return True
def ajaxWebserv():
# minimal Ajax in Control Webserver
global s,led
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #create stream socket
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) #Set the value of the given socket option
s.bind((wlan.ifconfig()[0], 80)) #bind ip and port
s.listen(1) #listen message
while True:
conn, addr = s.accept() #Accept a connection,conn is a new socket object
#print("Got a connection from %s" % str(addr))
request = conn.recv(1024) #Receive 1024 byte of data from the socket
conn.sendall('HTTP/1.1 200 OKnConnection: closenServer: FireBeetlenContent-Type: text/htmlnn')
request = str(request)
ib = request.find('Val=') #find the string 'Val=' from request
if ib > 0 :
ie = request.find(' ', ib) #init address of the index with ib,then find ' '
Val = request[ib+4:ie] #get the string of ib+4 to ie in the request
print("Val =", Val)
led.duty(int(Val)*100) #set the duty of led
conn.send(Val) #send data
else:
with open('esp32c3.htm', 'r') as html: #open file 'webCtrl.htm' with readonly
conn.sendall(html.read()) #read data from 'webCtrl.htm',and send all of the data
conn.sendall('rn')
conn.close() #close file
#print("Connection wth %s closed" % str(addr))
#Catch exceptions,stop program if interrupted accidentally in the 'try'
try:
led=PWM(Pin(10),freq=100) #create led object
led.init()
led.duty(0)
connectWifi(SSID, PASSWORD)
ajaxWebserv()
except:
if (s):
s.close()
led.deinit()
wlan.disconnect()
wlan.active(False)