Question

我正在做功课，将传感器数据发送到PHP。我正在使用Wamp服务器和phpMyAdmin。我已连接NodeMCU WIFI并看到了一个数据，但是无法将数据保存到数据库中。错误提示：

GET FAILED, error no: -1, error: connection refused

这是我的代码：

void loop() {

  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    int value=analogRead(A0); 
    int heartbeat=int(60/(float(value)/1000));
    float heart = heartbeat;
    float temp = mlx.readObjectTempC();

    String phpHost =host;
    phpHost+="/DogSensor_pre.php?temp=" + String(temp) + "&heart=" + String(heart);
    Serial.print("Connect to ");
    Serial.println(phpHost);

    http.begin(phpHost);
    int httpCode = http.GET();
    http.setTimeout(3000);

    if(httpCode > 0) {
      Serial.printf("GET code : %d\n\n", httpCode);

      if(httpCode == HTTP_CODE_OK) {
        String payload = http.getString();
        Serial.println(payload);
      }
    } 
    else {
      Serial.printf("GET failed, error no: %d, error: %s\n", httpCode , http.errorToString(httpCode).c_str());
    }
    http.end();
  }
}

<?php
$servername="*****";
$username="******";
$password="*****";
$dbname="*****";

$conn = mysqli_connect($servername, $username, $password, $dbname);

if(mysqli_connect_errno()){
  echo "Failed to connect to MySql: ";
  mysqli_connect_error();
}
$temp = $_GET["temp"];
$heart = $_GET["heart"];
$sql = "INSERT INTO ****.doghealth_pre(temp, heart) VALUES($temp, $heart)";

mysqli_query($conn, $sql);

mysqli_close($conn);
?>

http.GET()连续具有-1值。我认为这就是问题所在，但我不是Web编程专家。

如何解决此问题？如何解决connection refused错误？

将传感器数据从nodemcu发送到PHP MySQL

0 个答案: