使用 NodeMCU ESP8266 將 Arduino 數據發送到 mySQL 數據庫

Question

請在我的代碼中幫助我。 我有從 mySql 發送和獲取數據的 arduino 代碼。 它運行良好並將數據存儲到數據庫中。 問題是，如果我打開按鈕，值 1 會存儲在數據庫中，但是當我關閉按鈕時，值 0 不會存儲在數據庫中。

這是我的arduino代碼：

//Arduino Code
#include <SoftwareSerial.h>

SoftwareSerial s(5,6);//Rx,Tx
int buttonPinBulb = 11;
int relay1 = 10;
int buttonBulb;
int currentStatus = LOW;
unsigned long lastMillis = 0;
const unsigned long debounceTime = 100;

void setup() {
  // put your setup code here, to run once:
  pinMode(buttonPinBulb, INPUT_PULLUP);
  pinMode(relay1, OUTPUT);
  s.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  buttonBulb = digitalRead(buttonPinBulb);
  bulbOnOff(buttonBulb);
}

int bulbOnOff(int buttonBulb) {
  unsigned long currentMillis = millis();
  // protect against overflow
  if ( (currentMillis - lastMillis > debounceTime) || (currentMillis < lastMillis)) {

    if (buttonBulb != currentStatus) {
      digitalWrite(relay1, buttonBulb);
      //Serial.println(!buttonBulb);
      currentStatus = buttonBulb;

      // update database here
      if(s.available()>0)
            {
            s.write(!buttonBulb);
            }

      lastMillis = currentMillis;
    }
  }
  return 0;
}

以下是nodeMCU ESP8266代碼

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <SoftwareSerial.h>

SoftwareSerial s(D6, D5); //RX,TX
int buttonBulb;
int Led_OnBoard = 2;
const char* ssid = "iPhone";                  // Your wifi Name
const char* password = "Qaser.shah.123";          // Your wifi Password
const char *host = "172.20.10.6"; //Your pc or server (database) IP, example : 192.168.0.0 , if you are a windows os user, open cmd, then type ipconfig then look at IPv4 Address.

void setup() {
  // put your setup code here, to run once:
  wifiConnection();
  s.begin(115200);
}

int wifiConnection() {
  pinMode(Led_OnBoard, OUTPUT);       // Initialize the Led_OnBoard pin as an output
  Serial.begin(115200);
  WiFi.mode(WIFI_OFF);        //Prevents reconnection issue (taking too long to connect)
  delay(1000);
  WiFi.mode(WIFI_STA);        //This line hides the viewing of ESP as wifi hotspot

  WiFi.begin(ssid, password);     //Connect to your WiFi router
  Serial.println("");

  Serial.print("Connecting");
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    digitalWrite(Led_OnBoard, LOW);
    delay(250);
    Serial.print(".");
    digitalWrite(Led_OnBoard, HIGH);
    delay(250);
  }

  digitalWrite(Led_OnBoard, HIGH);
  //If connection successful show IP address in serial monitor
  Serial.println("");
  Serial.println("Connected to Network/SSID");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());  //IP address assigned to your ESP
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  s.write("s");
  if (s.available() > 0)
  {
    buttonBulb = s.read();
    Serial.println(buttonBulb);
    int result = updateDatabase(buttonBulb);
    if(result != 0){
      //error updating database
      Serial.print("error updating database");
      }
  }
}

int updateDatabase(int buttonBulb){
    HTTPClient http;    //Declare object of class HTTPClient

  //String ButtonState;
  String buttonValueSend, postData;
  
  buttonValueSend = String(buttonBulb);   //String to interger conversion
 
  //Post Data
  postData = "buttonBulb=" + buttonValueSend;
  
  http.begin("http://172.20.10.6/Nodemcu_db_record_view/InsertDB.php");              //Specify request destination
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");    //Specify content-type header

  int httpCode = http.POST(postData);   //Send the request
  String payload = http.getString();    //Get the response payload
  
  Serial.println(httpCode);   //Print HTTP return code
  Serial.println(payload);    //Print request response payload
  Serial.println("Button Value send=" + buttonValueSend);

  http.end();  //Close connection
  return 0;
  }

以下是我存儲 Arduino 數據的 php 代碼

<?php
//Creates new record as per request
    //Connect to database
    $servername = "localhost";      //example = localhost or 192.168.0.0
    $username = "root";     //example = root
    $password = ""; 
    $dbname = "automation";

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Database Connection failed: " . $conn->connect_error);
    }

    //Get current date and time
    date_default_timezone_set('Asia/Karachi');
    $d = date("Y-m-d");
    $t = date("H:i:s");

    if(!empty($_POST['buttonBulb']))
    {
        $buttonBulb = $_POST['buttonBulb'];
        
        $sql = "INSERT INTO project (ButtonState, Date, Time) VALUES ('".$buttonBulb."', '".$d."', '".$t."')"; //nodemcu_ldr_table = Youre_table_name

        if ($conn->query($sql) === TRUE) {
            echo "OK";
        } else {
            echo "Error: " . $sql . "<br>" . $conn->error;
        }
    }

    $conn->close();
?>

查看輸出圖像 在此圖像中，OK 以值 1 打印，但未以值 0 打印 OK

我認為有什么問題或者我忘記了一些事情，這就是它沒有發生的原因。

非常感謝您的任何贊賞。

Answer 1

您可以創建一個單獨的函數來更新數據庫，並僅在按鈕狀態更改時調用更新。

結合我對您上一個問題的回答，它看起來像這樣：

void loop() {

    unsigned long currentMillis = millis();

    if ( (currentMillis - lastMillis > debounceTime)
        || (currentMillis < lastMillis)) {  // protect against overflow
        
        int buttonBulb = digitalRead(buttonPinBulb);

        if (buttonBulb != currentStatus) {

            digitalWrite(relay1, buttonBulb);
            Serial.println(buttonBulb);
            currentStatus = buttonBulb;

            // update database
            int result = updateDatabase(buttonBulb);

            if (result != 0) {
                // error updating database
            }
        }

        lastMillis = currentMillis; 
    }
}

int updateDatabase(int buttonvalue) {

    HTTPClient http;    //Declare object of class HTTPClient

    String buttonValueSend, postData;
    buttonValueSend = String(buttonvalue);   //String to integer conversion

    // ...

    http.end();  //Close connection
    
    return 0; // for example return 0 on success, -1 on error
}

Answer 2

我找到了問題所在。 問題出在我的 php 代碼中，這就是為什么 1 會存儲在數據庫中而 0 不會。

這是我在 php 代碼中所做的更改，我剛剛刪除了if(!empty(&_POST['buttonBulb'])){}在 if 語句中使用的代碼現在不在 if 語句中。 原因背后的原因是，當我向此代碼發送 1 時，它是可以的，但是如果發送 0，則 is 語句假定沒有值並且 buttonBulb 變量為空。

感謝所有在此代碼中幫助我的人。 現在我要進行這個項目的下一步，如果我有一些問題，我會問。

特別感謝@Danny_ds