esp8266控制舵机开门

以下是基于ESP8266控制舵机开门的方法：

1. 确保你已经连接好了ESP8266和舵机，并且已经安装了相应的库。

2. 在Arduino IDE中编写以下代码：

#include <Servo.h>
#include <PubSubClient.h>
#include <ESP8266WiFi.h>

// WiFi信息
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// MQTT信息
const char* mqtt_server = "your_MQTT_SERVER";
const char* mqtt_username = "your_MQTT_USERNAME";
const char* mqtt_password = "your_MQTT_PASSWORD";
const char* mqtt_topic = "your_MQTT_TOPIC";

// 舵机信息
Servo myservo;
int servoPin = D1; // 舵机连接的引脚
int openAngle = 90; // 开门时舵机转动的角度

// WiFi客户端和MQTT客户端
WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // 初始化串口
  Serial.begin(115200);

  // 连接WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // 连接MQTT服务器
  client.setServer(mqtt_server, 1883);
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP8266Client", mqtt_username, mqtt_password )) {
      Serial.println("Connected to MQTT");
    } else {
      Serial.print("Failed with state ");      Serial.print(client.state());
      delay(2000);
    }
  }

  // 初始化舵机
  myservo.attach(servoPin);
}

void loop() {
  // 检查MQTT连接
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  // 等待开门指令
  if (client.subscribe(mqtt_topic)) {
    Serial.println("Subscribed to MQTT topic");
  }
}

void reconnect() {
  // 重新连接WiFi
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  // 重新连接MQTT服务器
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP8266Client", mqtt_username, mqtt_password )) {
      Serial.println("Connected to MQTT");
      client.subscribe(mqtt_topic);
    } else {
      Serial.print("Failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

// 处理MQTT消息
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // 如果收到开门指令，就打开门
  if ((char)payload[0] == 'O') {
    myservo.write(openAngle);
    delay(1000);
    myservo.write(0);
  }
}

3. 将代码上传到ESP8266开发板中。

4. 在手机上点击开门按钮，发送MQTT消息到服务器。

5. ESP8266开发板订阅MQTT消息，接收到开门指令。

6. ESP8266开发板发送PWM信号到舵机转动。

7. 舵机收到消息转动一定角度，拉动门阀，门打开。