“沒有可用的插座”-Arduino上的Wifi Shield

Question

我有一個LDR /光電管，它將一個值1或0（取決於值）發送到我的網址上的文本文件。 該代碼將運行幾秒鍾，然后打印出No Socket available 。

任何幫助將不勝感激; 下面的代碼。

#include <SPI.h>
#include <WiFi.h>

int LDR = A0;
int LED = 11;
char ssid[] = "SSID";
char password[] = "password";
int status = WL_IDLE_STATUS;


char server[] = "www.example.com";
int value;

void setup() {
  Serial.begin(9600);
  pinMode(LDR, INPUT);
  pinMode(LED, OUTPUT);
  connectWifi();
  printWifiStatus();
  // postData();
}

void loop() {
  value = analogRead(LDR);
  postData();

  delay(10000);
}

void connectWifi() {
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, password);
    delay(500);
  }
}

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

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

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

void postData() {
  WiFiClient client;
  if (client.connect(server, 80)) {
    Serial.println("Connecting...");
    if (value > 350) {
      Serial.println("0");
      digitalWrite(LED, LOW);
      String data = "value=0";
      client.print("GET /example/client.php?");
      client.print(data);
      client.println(" HTTP/1.1");
      client.println("Host: www.example.com");
      client.println("Connection: close");
      client.println(); client.println();
      //client.stop();
    } else {
      Serial.println("1");
      digitalWrite(LED, HIGH);
      String data = "value=1";
      client.print("GET /example/client.php?");
      client.print(data);
      client.println(" HTTP/1.1");
      client.println("Host: www.example.com");
      client.println("Connection: close");
      client.println(); client.println();
      //client.stop();
    }
  } else {
    Serial.println("Connection failed");
    client.stop();
  }

}

輸出：

Attempting to connect to SSID
SSID: SSID
IP Address: 255.255.255.255
signal strength (RSSI):-47 dBm
Connecting...
1
Connecting...
0
Connecting...
0
Connecting...
0
No Socket available
Connection failed
No Socket available
Connection failed
No Socket available
Connection failed
No Socket available

實際網址已省略。

Answer 1

首先，嘗試不使用“ delay（）”，並且每0.5秒調用一次此函數“ postData() ”。 嘗試使用millis()函數執行計時器操作，如下所示：

unsigned long timerBefore = 0;
const int timer = 1000; //1 second

現在在您的loop()

unsigned long timerNow=millis();
if((unsigned long)(timerNow-timerBefore)>=timer){
   postData();
   timerBefore=millis();
}

該代碼我不會“暫停”您的微控制器，並且會每秒調用一次該函數。