Question

我正在尝试使用Arduino，Ethernet Shield和Xbee Shield进行一些实验。我演示了这样的设置板：

第1组：Arduino Uno + Xbee shield：广播信号

第2组：Arduino Uno + Xbee屏蔽+以太网屏蔽：接收来自的信号第1组，从AT命令获取信号强度并将其打印到浏览器中。

这里的问题是我发送到Serial my ATDB命令后无法获得结果，实际上，我不确定它是否按预期工作。

以下是我用来检索信号强度的代码。

int data;

void setup()
{
  Serial.begin(9600);
}

void receiver_checker(){  
  delay(1200);
  Serial.print("+++");
  delay(1200);
  bool bOK = false;
  while (Serial.available() > 0) {
    Serial.write(Serial.read());
     bOK = true;
  }

  if(bOK)
  {
    Serial.println();
    Serial.println("ATDB");
    delay(100);
    while (Serial.available() > 0) {
    Serial.write(Serial.read());
    }
    Serial.println();
  }

  Serial.println();
}

void loop()
{  
  while(Serial.available() > 0){
    data = Serial.read();
    if(data == '1'){
      // Broadcaster 1
      //Serial.println("1------------------");
      receiver_checker();      
    }
  }
}

这部分按照我的预期工作，它以十六进制数字打印出它收到的最后一个包的信号强度。

以下是我将上一个和Web服务器教程中的服务器部分组合在一起的代码：

#include <SPI.h>
#include <Ethernet.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xCA, 0xFE, 0x00, 0x00, 0x00, 0x02
};
IPAddress ip(1, 1, 1, 2);
int data;
int count = 0;
char result;
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  // start the Ethernet connection and the server:
  Ethernet.begin(mac, ip);
  server.begin();
  // Serial.print("server is at ");
  // Serial.println(Ethernet.localIP());
}


void loop() {
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    // Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // Serial.write(c);
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          if (Serial.available() > 0) {
            // read the oldest byte in the serial buffer:
            data = Serial.read();
            // if it's a capital H (ASCII 72), turn on the LED:
            if (data == '1') {
              count += 1;
              client.print("The number of times:");
              client.print(count);
              result = receiver_checker();
              client.print("========================");
              client.print(result);
              client.print("========================");
            } 
          }

          client.println("</html>");
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
    Serial.println("client disconnected");
  }
}

char receiver_checker(){
  char signal;  
  delay(1200);
  Serial.print("+++");
  delay(1200);
  bool bOK = false;
  while (Serial.available() > 0) {
    Serial.write(Serial.read());
     bOK = true;
  }

  if(bOK)
  {
    Serial.println();
    Serial.println("ATDB");
    delay(100);
    while (Serial.available() > 0) {
     signal = Serial.read();
    }
    Serial.println();
  } 
  Serial.println();
  return signal;
}

如果还有另一种与Xbee盾牌互动的方式，请不要像我一样直接询问并直接获得回复，请告诉我！

Answer 1

您的receiver_checker()函数正在从XBee模块读回字符，只返回收到的最后一个字符，这可能是回车符或换行符。

更新该功能以返回int，并将while (Serial.available() > 0)替换为以下内容：

signal = (int) strtoul(Serial.readString().c_str(), 0, 16);

当XBee返回十六进制值时。如果它返回小数值，请将16参数更改为10。

从Serial获取Xbee响应并发送到浏览器

1 个答案: