NodeMCU温度读数为Raspberry Pi无线

Question

我目前在将从温度传感器收集的数据发送到我的Raspberry Pi时遇到问题。 Pi表示尚未收到任何数据。我也不确定GET和POST是如何工作的。我对这些东西很新，所以任何帮助都会非常感激。

也有人可以查看我的sendTemperatureTS方法和我的PHP代码，因为我说我是新手。顺便说一下，我在Raspberry Pi中的/ var / www中的PHP文件夹中创建了我的PHP文件。我在PHP文件夹中使用命令sudo nano collectdata.php来编写我的代码。

NodeMCU的Arduino代码：

#include <ESP8266WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define myPeriodic 15 //in sec | Thingspeak pub is 15sec
#define ONE_WIRE_BUS 2  // DS18B20 on arduino pin2 corresponds to D4 on physical board

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
float prevTemp = 0;
const char* server = "172.168.2.143";
const char* MY_SSID = "AkhuogTkhbbEjhbuvouvr7i2"; 
const char* MY_PWD = "2pkpmbipsrbeirbp3niag%";
int sent = 0;

void setup() {
  Serial.begin(115200);
  connectWifi();
}

void loop() {
  float temp;
  //char buffer[10];
  DS18B20.requestTemperatures(); 
  temp = DS18B20.getTempCByIndex(0);
  //String tempC = dtostrf(temp, 4, 1, buffer);//handled in sendTemp()
  Serial.print(String(sent)+" Temperature: ");
  Serial.println(temp);

  sendTemperatureTS(temp);
  int count = myPeriodic;
  while(count--)
  delay(1000);
}

void connectWifi() {
  Serial.print("Connecting to "+*MY_SSID);
  WiFi.begin(MY_SSID, MY_PWD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("Connected");
  Serial.println("");  
}//end connect

void sendTemperatureTS(float temp) {
  WiFiClient client;
  if (client.connect(server, 80)) {
    Serial.println("WiFi Client connected ");
    String postStr = "/php/";
    postStr += "?temp=";
    postStr += String(temp);
    postStr += "\r\n\r\n";
    client.print("POST 172.168.2.143/php/collectdata.php HTTP/1.1\n");
    client.print("Host: 122.168.2.143\n");
    client.print("Connection: close\n");
    client.print("Content-Type: application/x-www-form-urlencoded\n");
    client.print("Content-Length: ");
    client.print(postStr.length());
    client.print("\n\n");
    client.print(postStr);
    delay(1000);
  }//end if
  sent++;
  client.stop();
}

PHP代码：

<?php
$servername = “172.168.2.143”;
$username = “esp8266”;
$password = “Tutorial”;
$dbname = “esp8266”;
$temp = $_POST[‘temp’];
$conn = mysql_connect(“172.168.2.143”,”esp8266”,”Tutorial”);
if(!$conn) {
  die(‘Could not connect: ’ . mysql_error());
}
$datenow = date(‘Y-m-d’);
$sql = “INSERT INTO `JSDataTable`(`logdate`,`temperature`) VALUES (\”$datenow\”,\”$temp\”)”;
$result = mysql_query($sql);
if(!result) {
  die(‘Invalid query: ‘ . mysql_error());
}
echo “<h1>The data has been sent!</h1>”;
mysql_close($conn);

?>

Answer 1

在ESP的HTTP请求中，您有：

client.print("POST /php/collectdata.php HTTP/1.1\n");
client.print("Host: 172.168.2.143\n");

122.168.2.143错误输入可能。应该是172.168.2.143。

另外，您可能希望在HTTP请求行和\ n插入\ r \ n。

Answer 2

    #include <ESP8266WiFi.h>
    #include <OneWire.h>
    #include <DallasTemperature.h>
    #include <WiFiClient.h>

    #define myPeriodic 15 //in sec | Thingspeak pub is 15sec
    #define ONE_WIRE_BUS 2  // DS18B20 on arduino pin2 corresponds to D4 on physical board

    OneWire oneWire(ONE_WIRE_BUS);
    DallasTemperature DS18B20(&oneWire);
    float prevTemp = 0;
    const char* server = "172.168.2.143";

    const char* MY_SSID = "AkhuogTkhbbEjhbuvouvr7i2"; 
    const char* MY_PWD = "2pkpmbipsrbeirbp3niag%";
    int sent = 0;

    void setup() {
      Serial.begin(115200);
      connectWifi();
    }

    void loop() {
      float temp;
      //char buffer[10];
      DS18B20.requestTemperatures(); 
      temp = DS18B20.getTempCByIndex(0);
      //String tempC = dtostrf(temp, 4, 1, buffer);//handled in sendTemp()
      Serial.print(String(sent)+" Temperature: ");
      Serial.println(temp);

      //if (temp != prevTemp)
      //{
      //sendTemperatureTS(temp);
      //prevTemp = temp;
      //}

      sendTemperatureTS(temp);
      int count = myPeriodic;
      while(count--)
      delay(1000);
    }

    void connectWifi()
    {
      Serial.print("Connecting to "+*MY_SSID);
      WiFi.begin(MY_SSID, MY_PWD);
      while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.print(".");
      }

      Serial.println("");
      Serial.println("Connected");
      Serial.println("");  
    }//end connect

    void sendTemperatureTS(float temp)
    {  
       WiFiClient client;

       if (client.connect(server, 80)) { 
         Serial.println("WiFi Client connected ");

         String url = "/collectdata.php?";
    url += "&temp="; 
    url += temp;
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Server: " + server + "\r\n" + 
               "Connection: close\r\n\r\n");
    }