手把手带你使用ESP8266 与 STM32F103C8实现网络服务器 前言 随着现在物联网设备的而越来越多，现在市场上出现越来越多的物联网设备，其中 ESP8266 是最受欢迎、价格便宜且易于使用的模块，它可以将您的硬件连接到互联网。 今天我们就以ESP8266和STM32来实现一台网络服务器，我们使用 ESP8266 将 STM32F103C8 连接到互联网。 ESP8266 Wi-Fi 模块与 STM32F103C8 板接口，并将数据发送到 ESP8266 网络服务器上托管的网页。 所需硬件 STM32F103C8板ESP8266 无线无线模块笔记本电脑和无线网络热点 ESP8266 模块 大多数人将 ESP8266 称为 WIFI 模块，但它实际上是一个微控制器。ESP8266 是乐鑫公司（一家总部位于上海的公司）开发的微控制器的名称。该微控制器具有执行WIFI相关活动的能力，因此被广泛用作WIFI模块。 引脚说明 GND：接地TX：发射传输数据位GPIO2：通用输入/输出 2CH_PD：使能GPIO0：通用输入/输出0RST：复位RX：接收数据位VCC：+3.3 V 常用AT指令 AT 命令用于与 ESP8266 通信。下表显示了一些常用的 AT 命令 电路图和连接 下图显示了STM32和ESP8266无线模块之间的连接。 SMT32F103C8具有三套UART串行通信。在下图中，您可以看到相同的以下引脚： ESP8266 使用串行通信与STM32进行通讯。所以这里 ESP8266 的 TX 和 RX 都与 STM32 板的串行 2 端口 （PA2 和 PA3） 连接。 代码解释 ESP8266 与 STM32 的接口工作非常简单。您可以在本教程末尾的代码中找到完整的工作。 首先，我们需要按照电路图中所示进行电路连接。上传代码后，打开串行监视器（工具>>串行监视器）以查看发生的情况。您将在串行监视器上看到IP地址，从串行监视器复制IP地址并将其粘贴到浏览器中，然后单击Enter以查看我们的网页。请记住将计算机和 ESP8266 模块连接到同一 Wi-Fi 网络上。 完整的代码在最后给出，并通过注释很好地解释了，在这里我们解释了其中的几个重要部分。 首先，我们使用以下两个语句开始串行监视器和 ESP8266 的串行通信： Serial.println(cmd); Serial2.println(cmd); 注意： 我使用过STM32串行2端口的引脚（PA2，PA3），因为它可以承受3.3V。 然后，我们需要让 ESP8266 准备就绪，方法是通过重置任何旧的已连接的 AP 并将其设置为 AP 和 STA 来退出任何旧的 AP connect_wifi("AT",100); //Sends AT command with time(Command for Acknowledgement) connect_wifi("AT+CWMODE=3",100); //Sends AT command with time (For setting mode of Wi-Fi) connect_wifi("AT+CWQAP",100); //Sends AT command with time (for Quit AP) connect_wifi("AT+RST",5000); //Sends AT command with time (For RESETTING WIFI) 然后将 ESP8266 与无线网络连接。您必须填写您的Wi-Fi详细信息，如下面的代码所示： connect_wifi("AT+CWJAP=\"Pramo\",\"pokemon08\"",7000); //provide your WiFi username and password here 然后我们获取 ESP8266 模块的 IP 地址，并使用下面的代码将其显示在串行监视器上 Serial2.println("AT+CIFSR"); //GET IP AT COMMAND if(Serial2.find("STAIP,")) //This finds the STAIP that is the STATIC IP ADDRESS of ESP8266 Serial.print(IP); //prints IP address in Serial monitor 接下来，我们将为网页编写 HTML 代码。要将HTML代码转换为Arduino代码，您可以使用此链接。 HTML在线转Arduino代码 webpage = "

Welcome to Circuit Digest

"; //This is the heading line with black font colour String name="

Circuit Digest

A community of electrical and electronics students, engineers and makers

"; String data="

Data Received Successfully.....

"; //These two lines are of two paragraph webpage = "Click Here to get into circuitdigest.com"; //At last we insert the hyperlink to link the website address 接下来在void send() 函数中，我们使用发送网络数据函数打印了HTML，并使用AT + CIPCLOSE = 0关闭了服务器连接 完成所有工作后，您可以通过在任何 Web 浏览器中打开 ESP8266 的 IP 并单击网页上显示的链接来测试工作，单击此处进入 circuitdigest.com，如下所示 单击链接后，您会在网页上看到一条文本，上面写着Data Received Successfully..... 完整代码 //Interfacing ESP8266 Wi-Fi with STM32F103C8 //CIRCUIT DIGEST //NOTE: Serial is serial monitor with baud rate(9600) //NOTE: Serial2 (TX2, RX2)is connected with ESP8266(RX,TX)respectively with baud rate (9600) String webpage = ""; //String variable to store characters int i = 0, k = 0, x = 0; //integer variables String readString; //using readString feature to read characters boolean No_IP = false; //boolean variables String IP = ""; //String variable to store data char temp1 = '0'; //character variable String name = "

Circuit Digest

A community of electrical and electronics students, engineers and makers

"; //String with html notations String data = "

Data Received Successfully.....

"; //String with html void check4IP(int t1) //A function to check ip of ESP8266 { int t2 = millis(); while (t2 + t1 > millis()) { while (Serial2.available() > 0) { if (Serial2.find("WIFI GOT IP")) { No_IP = true; } } } } void get_ip() //After cheacking ip ,this is a function to get IP address { IP = ""; char ch = 0; while (1) { Serial2.println("AT+CIFSR"); //GET IP AT COMMAND while (Serial2.available() > 0) { if (Serial2.find("STAIP,")) //This finds the STAIP that is the STATIC IP ADDRESS of ESP8266 { delay(1000); Serial.print("IP Address:"); while (Serial2.available() > 0) { ch = Serial2.read(); //Serial2 reads from ESP8266 if (ch == '+') break; IP += ch; } } if (ch == '+') break; } if (ch == '+') break; delay(1000); } Serial.print(IP); //prints IP address in Serial monitor Serial.print("Port:"); Serial.println(80); } void connect_wifi(String cmd, int t) //This function is for connecting ESP8266 with wifi network by using AT commands { int temp = 0, i = 0; while (1) { Serial.println(cmd); //Sends to serial monitor Serial2.println(cmd); //sends to ESP8266 via serial communication while (Serial2.available()) { if (Serial2.find("OK")) i = 8; } delay(t); if (i > 5) break; i++; } if (i == 8) Serial.println("OK"); else Serial.println("Error"); } void wifi_init() //This function contains AT commands that passes to connect_wifi() { connect_wifi("AT", 100); //Sends AT command with time(Command for Achknowledgement) connect_wifi("AT+CWMODE=3", 100); //Sends AT command with time (For setting mode of Wifi) connect_wifi("AT+CWQAP", 100); //Sends AT command with time (for Quit AP) connect_wifi("AT+RST", 5000); //Sends AT command with time (For RESETTING WIFI) check4IP(5000); if (!No_IP) { Serial.println("Connecting Wifi...."); connect_wifi("AT+CWJAP=\"Pramo\",\"pokemon08\"", 7000); //provide your WiFi username and password here } else { } Serial.println("Wifi Connected"); get_ip(); connect_wifi("AT+CIPMUX=1", 100); //Sends AT command with time (For creating multiple connections) connect_wifi("AT+CIPSERVER=1,80", 100); //Sends AT command with time (For setting up server with port 80) } void sendwebdata(String webPage) //This function is used to send webpage datas to the localserver { int ii = 0; while (1) { unsigned int l = webPage.length(); Serial.print("AT+CIPSEND=0,"); Serial2.print("AT+CIPSEND=0,"); Serial.println(l + 2); Serial2.println(l + 2); delay(100); Serial.println(webPage); //sends webpage data to serial monitor Serial2.println(webPage); //sends webpage data to serial2 ESP8266 while (Serial2.available()) { if (Serial2.find("OK")) { ii = 11; break; } } if (ii == 11) break; delay(100); } } void setup() { Serial.begin(9600); //begins serial monitor with baud rate 9600 Serial2.begin(9600); //begins serial communication with esp8266 with baud rate 9600 (Change according to your esp8266 module) wifi_init(); Serial.println("System Ready.."); } void loop() { k = 0; Serial.println("Please Refresh your Page"); while (k < 1000) { k++; while (Serial2.available()) { if (Serial2.find("0,CONNECT")) { Serial.println("Start Printing"); Send(); Serial.println("Done Printing"); delay(1000); } } delay(1); } } void Send() //This function contains data to be sent to local server { webpage = "

Welcome to Circuit Digest

"; sendwebdata(webpage); webpage = name; sendwebdata(webpage); delay(1000); webpage = "Click Here to get into circuitdigest.com"; webpage += data; sendwebdata(webpage); Serial2.println("AT+CIPCLOSE=0"); //Closes the server connection } 结语 看到这里相信你已经知道了使用共ESP266与STM32通讯的整个思路和流程了，快拿你的设备来试一下吧，相信你也可以成功的！ 👇点击下方公众号卡片获取资料👇