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项目分享| WIFI&手动，两种方式控制8路继电器

本次项目分享如何使用 Blynk 和 ESP32 通过手动开关和智能手机控制 8 通道继电器模块，实现物联网智能家居自动化
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  • 本次项目分享如何使用 Blynk 和 ESP32 通过手动开关和智能手机控制 8 通道继电器模块，实现物联网智能家居自动化。

     

     

    这个项目只需要一个 8 通道继电器模块和 ESP32 板就可以完成这个智能家居项目（如果为了方便可以把LED、按键和供电接口像视频里一样整合到一块PCB上）：

    1. 通过 WiFi（Blynk App）控制家用电器

    2. 通过手动开关控制家用电器

    3. 在 Blynk 应用程序中监控实时反馈

    4. 无需联网即可手动控制家电

     

    ✔ 硬件连接

    硬件电路非常简单，如下图：

    使用ESP32 的GPIO引脚D23、D22、D21、D19、D18、D5、D25和D26来控制8个继电器。而GPIO 引脚D13、D12、D14、D27、D33、D32、D15和D4连接按钮以手动控制 8 个继电器。 

    在 Arduino IDE 中使用了INPUT_PULLUP函数，而不是使用上拉电阻。用5V手机充电器给智能继电器模块供电。 

    ✔使用 Blynk 通过无线网络控制继电器

    如果 ESP32 模块与 WiFi 连接了，就可以通过 Blynk App 和按钮控制家用电器了。使用 Blynk 应用程序，就意味着可以在任何地方控制、监控继电器的实时状态。

    如果 WiFi 不可用，可以通过按钮控制继电器。ESP32 每 3 秒检查一次 WiFi。当 WiFi 可用时，ESP32就会自动连接WiFi。

     

    ✔ 为 ESP32 配置 Blynk 应用程序

    Blynk是开源的物联网app平台，在我们之前分享的项目中经常出现。

    1.从 Google Play 商店或 App Store安装Blynk 应用程序。然后创建一个帐户并点击新项目。
    2.为项目命名，选择ESP32 Dev Board ，连接类型为 WiFi。然后点击创建。 

    3. Blynk 将向注册的电子邮件 ID 发送身份验证令牌。点击确定。 

    在 Blynk 应用程序中添加按钮小部件，8个按钮小部件来控制8个继电器。在这里，我为 8 个按钮使用了虚拟引脚 V1、V2、V3、V4、V5、V6、V7、V8。模式则是切换。

     

     ✔ Blynk ESP32 家庭自动化代码

    使用Arduino IDE对ESP32 DEV KIT V1进行编程，用过ESP32的人都会进行操作。
    在上传代码之前，必须安装 ESP32 开发板和 Blynk 库。然后在代码中输入 WiFi 名称、WiFi 密码和 Blynk Auth Token。
    选择DOIT ESP32 DEVKIT V1板和适当的PORT 。

    然后将代码上传到 ESP32 Board。

    ✔ 使用 Arduino IDE 对 ESP32 进行编程

    在将代码上传到 ESP32 时，如果看到“ Connecting....___ ”文本，则按下ESP32的BOOT按钮。


    ESP32代码如下：

     

    /**********************************************************************************
     *  TITLE: ESP32 Home Automation project using Blynk | Internet & Manual control with Realtime Feedback | 8-CHANNEL RELAY
     *  Click on the following links to learn more.
     *  YouTube Video: https://youtu.be/o1e5s_5p3FU
     *  Related Blog : https://iotcircuithub.com/blynk-esp32-home-automation/
     *  by Tech StudyCell
     **********************************************************************************/
    /*************************************************************
      Update the Preferences > Aditional boards Manager URLs:
      https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index.json
      Note: This requires ESP32 support package:
        https://github.com/espressif/arduino-esp32
      Download latest Blynk library here:
        https://github.com/blynkkk/blynk-library/releases/latest
     *************************************************************
      Change WiFi ssid, pass, and Blynk auth token to run :)
      Please be sure to select the right ESP32 module
      in the Tools -> Board menu!
     *************************************************************/
     
    #include <BlynkSimpleEsp32.h>
    BlynkTimer timer;
    // define the GPIO connected with Relays and switches
    #define RelayPin1 23  //D23
    #define RelayPin2 22  //D22
    #define RelayPin3 21  //D21
    #define RelayPin4 19  //D19
    #define RelayPin5 18  //D18
    #define RelayPin6 5   //D5
    #define RelayPin7 25  //D25
    #define RelayPin8 26  //D26
     
    #define SwitchPin1 13  //D13
    #define SwitchPin2 12  //D12
    #define SwitchPin3 14  //D14
    #define SwitchPin4 27  //D27
    #define SwitchPin5 33  //D33
    #define SwitchPin6 32  //D32
    #define SwitchPin7 15  //D15
    #define SwitchPin8 4   //D4
     
    #define wifiLed    2   //D2
     
    #define VPIN_BUTTON_1    V1
    #define VPIN_BUTTON_2    V2
    #define VPIN_BUTTON_3    V3
    #define VPIN_BUTTON_4    V4
    #define VPIN_BUTTON_5    V5
    #define VPIN_BUTTON_6    V6
    #define VPIN_BUTTON_7    V7
    #define VPIN_BUTTON_8    V8
     
    int toggleState_1 = 1; //Define integer to remember the toggle state for relay 1
    int toggleState_2 = 1; //Define integer to remember the toggle state for relay 2
    int toggleState_3 = 1; //Define integer to remember the toggle state for relay 3
    int toggleState_4 = 1; //Define integer to remember the toggle state for relay 4
    int toggleState_5 = 1; //Define integer to remember the toggle state for relay 5
    int toggleState_6 = 1; //Define integer to remember the toggle state for relay 6
    int toggleState_7 = 1; //Define integer to remember the toggle state for relay 7
    int toggleState_8 = 1; //Define integer to remember the toggle state for relay 8
     
    int wifiFlag = 0;
     
    #define AUTH "AUTH TOKEN"                 // You should get Auth Token in the Blynk App. 
    #define WIFI_SSID "WIFI NAME"             //Enter Wifi Name
    #define WIFI_PASS "WIFI PASSWORD"         //Enter wifi Password
     
    void relayOnOff(int relay){
     
        switch(relay){
          case 1:
                 if(toggleState_1 == 1){
                  digitalWrite(RelayPin1, LOW); // turn on relay 1
                  toggleState_1 = 0;
                  Serial.println("Device1 ON");
                  }
                 else{
                  digitalWrite(RelayPin1, HIGH); // turn off relay 1
                  toggleState_1 = 1;
                  Serial.println("Device1 OFF");
                  }
                 delay(100);
          break;
          case 2:
                 if(toggleState_2 == 1){
                  digitalWrite(RelayPin2, LOW); // turn on relay 2
                  toggleState_2 = 0;
                  Serial.println("Device2 ON");
                  }
                 else{
                  digitalWrite(RelayPin2, HIGH); // turn off relay 2
                  toggleState_2 = 1;
                  Serial.println("Device2 OFF");
                  }
                 delay(100);
          break;
          case 3:
                 if(toggleState_3 == 1){
                  digitalWrite(RelayPin3, LOW); // turn on relay 3
                  toggleState_3 = 0;
                  Serial.println("Device3 ON");
                  }
                 else{
                  digitalWrite(RelayPin3, HIGH); // turn off relay 3
                  toggleState_3 = 1;
                  Serial.println("Device3 OFF");
                  }
                 delay(100);
          break;
          case 4:
                 if(toggleState_4 == 1){
                  digitalWrite(RelayPin4, LOW); // turn on relay 4
                  toggleState_4 = 0;
                  Serial.println("Device4 ON");
                  }
                 else{
                  digitalWrite(RelayPin4, HIGH); // turn off relay 4
                  toggleState_4 = 1;
                  Serial.println("Device4 OFF");
                  }
                 delay(100);
          break;
          case 5:
                 if(toggleState_5 == 1){
                  digitalWrite(RelayPin5, LOW); // turn on relay 5
                  toggleState_5 = 0;
                  Serial.println("Device5 ON");
                  }
                 else{
                  digitalWrite(RelayPin5, HIGH); // turn off relay 5
                  toggleState_5 = 1;
                  Serial.println("Device5 OFF");
                  }
                 delay(100);
          break;
          case 6:
                 if(toggleState_6 == 1){
                  digitalWrite(RelayPin6, LOW); // turn on relay 6
                  toggleState_6 = 0;
                  Serial.println("Device6 ON");
                  }
                 else{
                  digitalWrite(RelayPin6, HIGH); // turn off relay 6
                  toggleState_6 = 1;
                  Serial.println("Device6 OFF");
                  }
                 delay(100);
          break;
          case 7:
                 if(toggleState_7 == 1){
                  digitalWrite(RelayPin7, LOW); // turn on relay 7
                  toggleState_7 = 0;
                  Serial.println("Device7 ON");
                  }
                 else{
                  digitalWrite(RelayPin7, HIGH); // turn off relay 7
                  toggleState_7 = 1;
                  Serial.println("Device7 OFF");
                  }
                 delay(100);
          break;
          case 8:
                 if(toggleState_8 == 1){
                  digitalWrite(RelayPin8, LOW); // turn on relay 8
                  toggleState_8 = 0;
                  Serial.println("Device8 ON");
                  }
                 else{
                  digitalWrite(RelayPin8, HIGH); // turn off relay 8
                  toggleState_8 = 1;
                  Serial.println("Device8 OFF");
                  }
                 delay(100);
          break;
          default : break;     
          } 
    }
     
    void with_internet(){
        //Manual Switch Control
        if (digitalRead(SwitchPin1) == LOW){
          delay(200);
          relayOnOff(1);
          Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget 
        }
        else if (digitalRead(SwitchPin2) == LOW){
          delay(200);
          relayOnOff(2);      
          Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);   // Update Button Widget
        }
        else if (digitalRead(SwitchPin3) == LOW){
          delay(200);
          relayOnOff(3);
          Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);   // Update Button Widget
        }
        else if (digitalRead(SwitchPin4) == LOW){
          delay(200);
          relayOnOff(4);
          Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);   // Update Button Widget
        }
        else if (digitalRead(SwitchPin5) == LOW){
          delay(200);
          relayOnOff(5);
          Blynk.virtualWrite(VPIN_BUTTON_5, toggleState_5);   // Update Button Widget 
        }
        else if (digitalRead(SwitchPin6) == LOW){
          delay(200);
          relayOnOff(6);     
          Blynk.virtualWrite(VPIN_BUTTON_6, toggleState_6);   // Update Button Widget
        }
        else if (digitalRead(SwitchPin7) == LOW){
          delay(200);
          relayOnOff(7);
          Blynk.virtualWrite(VPIN_BUTTON_7, toggleState_7);   // Update Button Widget
        }
        else if (digitalRead(SwitchPin8) == LOW){
          delay(200);
          relayOnOff(8);
          Blynk.virtualWrite(VPIN_BUTTON_8, toggleState_8);   // Update Button Widget
        }
    }
    void without_internet(){
        //Manual Switch Control
        if (digitalRead(SwitchPin1) == LOW){
          delay(200);
          relayOnOff(1);     
        }
        else if (digitalRead(SwitchPin2) == LOW){
          delay(200);
          relayOnOff(2);
        }
        else if (digitalRead(SwitchPin3) == LOW){
          delay(200);
          relayOnOff(3);
        }
        else if (digitalRead(SwitchPin4) == LOW){
          delay(200);
          relayOnOff(4);
        }
        else if (digitalRead(SwitchPin5) == LOW){
          delay(200);
          relayOnOff(5);     
        }
        else if (digitalRead(SwitchPin6) == LOW){
          delay(200);
          relayOnOff(6);
        }
        else if (digitalRead(SwitchPin7) == LOW){
          delay(200);
          relayOnOff(7);
        }
        else if (digitalRead(SwitchPin8) == LOW){
          delay(200);
          relayOnOff(8);
        }
    }
     
    BLYNK_CONNECTED() {
      // Request the latest state from the server
      Blynk.syncVirtual(VPIN_BUTTON_1);
      Blynk.syncVirtual(VPIN_BUTTON_2);
      Blynk.syncVirtual(VPIN_BUTTON_3);
      Blynk.syncVirtual(VPIN_BUTTON_4);
      Blynk.syncVirtual(VPIN_BUTTON_5);
      Blynk.syncVirtual(VPIN_BUTTON_6);
      Blynk.syncVirtual(VPIN_BUTTON_7);
      Blynk.syncVirtual(VPIN_BUTTON_8);
    }
     
    // When App button is pushed - switch the state
    BLYNK_WRITE(VPIN_BUTTON_1) {
      toggleState_1 = param.asInt();
      digitalWrite(RelayPin1, toggleState_1);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_2) {
      toggleState_2 = param.asInt();
      digitalWrite(RelayPin2, toggleState_2);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_3) {
      toggleState_3 = param.asInt();
      digitalWrite(RelayPin3, toggleState_3);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_4) {
      toggleState_4 = param.asInt();
      digitalWrite(RelayPin4, toggleState_4);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_5) {
      toggleState_5 = param.asInt();
      digitalWrite(RelayPin5, toggleState_5);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_6) {
      toggleState_6 = param.asInt();
      digitalWrite(RelayPin6, toggleState_6);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_7) {
      toggleState_7 = param.asInt();
      digitalWrite(RelayPin7, toggleState_7);
    }
     
    BLYNK_WRITE(VPIN_BUTTON_8) {
      toggleState_8 = param.asInt();
      digitalWrite(RelayPin8, toggleState_8);
    }
     
     
    void checkBlynkStatus() { // called every 3 seconds by SimpleTimer
     
      bool isconnected = Blynk.connected();
      if (isconnected == false) {
        wifiFlag = 1;
        digitalWrite(wifiLed, LOW); //Turn off WiFi LED
      }
      if (isconnected == true) {
        wifiFlag = 0;
        digitalWrite(wifiLed, HIGH); //Turn on WiFi LED
      }
    }
    void setup()
    {
      Serial.begin(9600);
     
      pinMode(RelayPin1, OUTPUT);
      pinMode(RelayPin2, OUTPUT);
      pinMode(RelayPin3, OUTPUT);
      pinMode(RelayPin4, OUTPUT);
      pinMode(RelayPin5, OUTPUT);
      pinMode(RelayPin6, OUTPUT);
      pinMode(RelayPin7, OUTPUT);
      pinMode(RelayPin8, OUTPUT);
     
      pinMode(wifiLed, OUTPUT);
     
      pinMode(SwitchPin1, INPUT_PULLUP);
      pinMode(SwitchPin2, INPUT_PULLUP);
      pinMode(SwitchPin3, INPUT_PULLUP);
      pinMode(SwitchPin4, INPUT_PULLUP);
      pinMode(SwitchPin5, INPUT_PULLUP);
      pinMode(SwitchPin6, INPUT_PULLUP);
      pinMode(SwitchPin7, INPUT_PULLUP);
      pinMode(SwitchPin8, INPUT_PULLUP);
     
      //During Starting all Relays should TURN OFF
      digitalWrite(RelayPin1, toggleState_1);
      digitalWrite(RelayPin2, toggleState_2);
      digitalWrite(RelayPin3, toggleState_3);
      digitalWrite(RelayPin4, toggleState_4);
      digitalWrite(RelayPin5, toggleState_5);
      digitalWrite(RelayPin6, toggleState_6);
      digitalWrite(RelayPin7, toggleState_7);
      digitalWrite(RelayPin8, toggleState_8);
     
      WiFi.begin(WIFI_SSID, WIFI_PASS);
      timer.setInterval(3000L, checkBlynkStatus); // check if Blynk server is connected every 3 seconds
      Blynk.config(AUTH);
    }
     
    void loop()
    { 
      if (WiFi.status() != WL_CONNECTED)
      {
        Serial.println("WiFi Not Connected");
      }
      else
      {
        Serial.println("WiFi Connected");
        Blynk.run();
      }
     
      timer.run(); // Initiates SimpleTimer
      if (wifiFlag == 0)
        with_internet();
      else
        without_internet();
    }

     

    项目来源：hackster.io

    制作者：Subhajit
     
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