Arduino UNO和ESP8266如何发送http响应

Question

我将esp8266连接到Arduino-Uno (WiFi Controlled LED using ESP8266 and Arduino)，它工作得很好。但是，当我在浏览器中调用(http://192.168.1.*/?led= on )时，我希望esp8266响应并在页面上显示消息(Ok/No)，我们能用AT命令做到这一点吗？或者其他任何方式。

void loop() {
 if (esp8266.available()) {
  if (esp8266.find("+IPD,")) {

String msg;
esp8266.find("?");
msg = esp8266.readStringUntil(' ');
String command1 = msg.substring(0, 3);
String command2 = msg.substring(4);

if (DEBUG) {
  Serial.println(command1); // Must print "led"
  Serial.println(command2); // Must print "ON" or "OFF"
}

delay(100);

if (command2 == "ON") {
  digitalWrite(led_pin, HIGH);
  // here i want send led is on now
} else {
  digitalWrite(led_pin, LOW);
  // here i want send led is off now
}

  }
 }
}

Answer 1

我建议在这个项目中使用ESP8266WebServer库。您可以创建一个HTML页面，其中包含两个单独的输入按钮，参数为On和Off，然后您可以将URL的状态从on更改为off，反之亦然。在ESP端，您可以获得参数的状态，如下所示

if(server.hasArg("ON")==true){
    digitalWrite(led_pin, HIGH);
}else if(server.hasArg("OFF")==true){
    digitalWrite(led_pin, HIGH);
}

我做过一个类似的项目https://ncd.io/thingspeak-weather-app-using-esp8266/和https://github.com/vbshightime/ESPMeshServer

Answer 2

此方法：

#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>

const int LED_PIN = 16;

IPAddress ip(192, 168, 0, 32);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);

WebServer server(9999);    

void handleLED();

void setup(void){

  WiFi.config(ip, gateway, subnet);   
  WiFi.begin("ssid","pw");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }   

  server.on("/ON", HTTP_GET, handleLED_ON);  
  server.on("/OFF", HTTP_GET, handleLED_OFF);     
  server.begin();

  Serial.begin(115200);
  Serial.println("Start");
}

void loop(void){

  server.handleClient(); 

}

void handleLED_ON() {
    digitalWrite(LED_PIN, HIGH);
    server.send(200,"text/plan","OK");
}

void handleLED_OFF() {
    digitalWrite(LED_PIN, LOW);
    server.send(200,"text/plan","OK");
}