Question

我有：

使用MySQL数据库进行家庭服务器设置并可用于网络
带有WiFi屏蔽连接到LED的Arduino

上面两个都是工作hunky dory - Arduino连接到WiFi并分配了IP地址。

我现在要做的是编写一些Arduino代码来读取存储在Web服务器数据库中的值。

如果我能弄清楚如何做到这一点，我可以从那里拿走它。有人可以提供一个如何操作的例子吗？

到目前为止我所做的更多细节：

下面的代码使用wifi shield连接到wifi。
使用Arduino Uno和v 1.05 of IDE
在本地NAS上设置PHP / MYSQL - ip 192.168.0.102/web/homeserver

简而言之，只需知道从已连接到网络的arduino查询Web服务器/数据库所需的内容。

#include <WiFi.h>

char ssid[] = "SSID_IS_HERE";     //  your network SSID (name) 
char pass[] = "MY_PASSWORD";  // your network password
int status = WL_IDLE_STATUS;     // the Wifi radio's status

void setup() {
    // Initialize serial and wait for port to open:
    Serial.begin(9600); 
    while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
    }

    // check for the presence of the shield:
    if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present"); 
    // don't continue:
    while(true);
    } 

    // attempt to connect to Wifi network:
    while ( status != WL_CONNECTED) { 
    Serial.print("Attempting to connect to WPA SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network:    
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    delay(10000);
    }

    // you're connected now, so print out the data:
    Serial.print("You're connected to the network");
    printCurrentNet();
    printWifiData();
}

void loop() {
    // check the network connection once every 10 seconds:
    delay(10000);
    printCurrentNet();
}

void printWifiData() {
    // print your WiFi shield's IP address:
    IPAddress ip = WiFi.localIP();
    Serial.print("IP Address: ");
    Serial.println(ip);
    Serial.println(ip);

    // print your MAC address:
    byte mac[6];  
    WiFi.macAddress(mac);
    Serial.print("MAC address: ");
    Serial.print(mac[5],HEX);
    Serial.print(":");
    Serial.print(mac[4],HEX);
    Serial.print(":");
    Serial.print(mac[3],HEX);
    Serial.print(":");
    Serial.print(mac[2],HEX);
    Serial.print(":");
    Serial.print(mac[1],HEX);
    Serial.print(":");
    Serial.println(mac[0],HEX);
}

void printCurrentNet() {
    // print the SSID of the network you're attached to:
    Serial.print("SSID: ");
    Serial.println(WiFi.SSID());

    // print the MAC address of the router you're attached to:
    byte bssid[6];
    WiFi.BSSID(bssid);    
    Serial.print("BSSID: ");
    Serial.print(bssid[5],HEX);
    Serial.print(":");
    Serial.print(bssid[4],HEX);
    Serial.print(":");
    Serial.print(bssid[3],HEX);
    Serial.print(":");
    Serial.print(bssid[2],HEX);
    Serial.print(":");
    Serial.print(bssid[1],HEX);
    Serial.print(":");
    Serial.println(bssid[0],HEX);

    // print the received signal strength:
    long rssi = WiFi.RSSI();
    Serial.print("signal strength (RSSI):");
    Serial.println(rssi);

    // print the encryption type:
    byte encryption = WiFi.encryptionType();
    Serial.print("Encryption Type:");
    Serial.println(encryption,HEX);
    Serial.println();
}

Answer 1

首先取决于你的arduino板，但如果你有盾牌，我认为你有一个arduino uno，例如。现在你需要在php中编写一个web服务，例如，在查询后响应存储在mysql中的值。假设：Arduino web client

您需要在服务器中创建一个名为ledstatus.php的文件，以便调用

www.yourwebserver / ledstatus.php？STAT = LED1 stat是读取led

的统计信息的命令

你的php文件，在mysql查询后简单响应一个整数值为0或1的echo ...

现在你的领导已经确定：

set const int ledPin =  13; 
pinMode(ledPin, OUTPUT);

并在此部分代码设置Web请求

 client.println("GET /ledstatus.php?stat=led1 HTTP/1.1");
 client.println("Host: www.yourwebserver"); 
 client.println("Connection: close");
 client.println();

并在此代码中读取请求响应

void loop()
 {
  // if there are incoming bytes available
  // from the server, read them and print them:
   if (client.available()) {
   char c = client.read();
   Serial.print(c);  // to see the value 
   digitalWrite(ledPin, atoi(c)); 
   // atoi is a function to convert ascii to integer
  }

   while(true);
}

希望这能帮到你

Arduino - 基于mysql数据库值通过wifi控制LED

到目前为止我所做的更多细节：

1 个答案: