Question

我正在尝试将信息从计算机发送到带蓝牙的Arduino。我正在使用Python进行蓝牙，使用pybluez库，在Windows上工作。

import bluetooth

target_name = "HC-05"
target_address = None

nearby_devices = bluetooth.discover_devices()
print nearby_devices

for bdaddr in nearby_devices:
    print bluetooth.lookup_name( bdaddr )
        if target_name == bluetooth.lookup_name( bdaddr ):
            target_address = bdaddr
            break

if target_address is not None:
    print "found target bluetooth device with address ", target_address
    sock=bluetooth.BluetoothSocket( bluetooth.RFCOMM )

    print "Trying connection"
    port = 3
    sock.connect((target_address, port))
    print "Trying sending"
    sock.send("1 2 3")
    print "Finished sending"
    sock.close()
else:
    print "could not find target bluetooth device nearby"

在arduino方面，我正在运行以下代码。

#include <stdlib.h>

//format [motor #][pwmA = 0, pwmB = 0]
const int MOTOR_PINS[5][2] = {{3,4}, {5,6}, {9, 10}, {23, 22}, {21, 20}};
const int SIGN = 1;
String msg = "";

void setup() {  
  Serial.begin(9600); //usb for testing
  Serial1.begin(9600);
}

void loop() {
  //check for inputs to bluetooth adapter
  while (Serial1.available()) {
   char reading = Serial1.read();
    if ((int)reading == 13 ) {
      Serial.println(msg);
      parseString(msg);
      msg = "";
    }
    else {
      msg += reading;
    }
  }
}

（我知道Python端口是硬编码的，计划稍后进行清理。）

无论如何，当我运行Python代码时，我成功找到了蓝牙设备。但是，当我尝试连接时出现错误，说IOError: A socket operation failed because the destination host was down.当我用PuTTY打开一个到COM3的会话时，我可以成功地将数据发送到Arduino（调用parseString）。我不明白有什么区别介于两者之间。

Answer 1

也许COM3连接到蓝牙，所以你的Python程序可以连接？

或者，您可以使用pyserial连接到COM3。 http://pyserial.sourceforge.net/shortintro.html

Answer 2

好的，感谢你的代码开始，通过修改它，我能够得到我想要的东西。

即使我得到了同样的IOError: A socket operation failed because the destination host was down.所以我首先将我的HC-05与PC（Windows）配对，因为我的HC-05密码已锁定。接下来，我开始创建一个循环，可以检查给定范围之间的每个端口。

虽然影响不大但我的建议是提升HC的序列BAUD @ 115200，可能会更好。

所以我的Python代码看起来像这样。

import bluetooth

#--Pair HC-05 with PC first

target_name = "BLUESAND"
target_address = None

nearby_devices = bluetooth.discover_devices()
print nearby_devices

for bdaddr in nearby_devices:
    print bluetooth.lookup_name( bdaddr )
    if target_name == bluetooth.lookup_name( bdaddr ):
        target_address = bdaddr
        break

if target_address is not None:
    print "found target bluetooth device with address ", target_address
    sock=bluetooth.BluetoothSocket( bluetooth.RFCOMM )

    print "Trying connection"
    #######################################
    i=0 # ---- your port range starts here
    maxPort = 3 # ---- your port range ends here
    err = True
    while err == True and i <= maxPort:
        print "Checking Port ",i
        port = i
        try:
            sock.connect((target_address, port))
            err = False
        except Exception,e:
            ## print the exception if you like
            i += 1
    if i > maxPort:
        print "Port detection Failed."
        exit(0)
    #######################################
    print "Trying sending"
    sock.send("Challange")
    print "Finished sending"
    print sock.recv()
    print "Finished receiving"
    sock.close()
else:
    print "could not find target bluetooth device nearby"

我的Arduino代码看起来像这样。

String str;

void setup() {
  Serial.begin(115200);     // opens serial port, sets data rate
}

void loop() {
  // send data only when you receive data:
  if (Serial.available() > 0) {
      str = Serial.readStringUntil('\n');

      // say what you got:
      Serial.print("I received: ");
      Serial.println("\""+str+"\"");
      //trim the string to skip the trailing CRLF
      str.trim(); 
  }
}

蓝牙和Arduino的问题

2 个答案: