python - 通过 serial1 将 Arduno Yun pin 信息发送到 linino python 脚本，通过 UDP 发送到 Max

Question

现在尝试让我的 arduino 草图通过 python 脚本发送。我无法让它发送过来。

Arduino 代码。

    /* Sketch for reading 4 analogue inputs for glove
*/

// Setup pin locations
int flexPin0 = A0; //analog pin 0
int flexPin1 = A1; //analog pin 1
int flexPin2 = A2; //analog pin 2
int flexPin3 = A3; //analog pin 3

int inByte = 0;

void setup(){
  Serial.begin(9600); 
  while (!Serial) {
    ;
  }  
  establishContact(); 
}

void loop(){
  // Read values
    // if we get a valid byte, read analog ins:
  if (Serial.available() > 0) {
    // get incoming byte:
    inByte = Serial.read();

  int flexSensorReading0 = analogRead(flexPin0); 
  delay(10);
  int flexSensorReading1 = analogRead(flexPin1);
  delay(10);
  int flexSensorReading2 = analogRead(flexPin2); 
  delay(10);
  int flexSensorReading3 = analogRead(flexPin3); 
  delay(10);

  // Output results to serial
    Serial.write(flexSensorReading0);
    Serial.write(flexSensorReading1);
    Serial.write(flexSensorReading2);
    Serial.write(flexSensorReading3);

  delay(50); //just here to slow down the output for easier reading
  }
}

void establishContact() {
  while (Serial.available() <= 0) {
    Serial.println('A');   // send a capital A
    delay(500);
  }
}

Python脚本

#!/usr/bin/python
import socket
import serial

ser = serial.Serial('/dev/ttyATH0', 9600)


while ser.read() != 'A':
#   do nothing
    pass


UDP_IP = "192.168.1.242"   #Max IP address
UDP_PORT = 8888
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP

while True: # ser.readline() == 'A':
    data_raw = read(8) #read 8 bytes
    sock.sendto(bytes(data_raw), (UDP_IP, UDP_PORT)) #sends the byte
    ser.write('A')

#recvmsg=sock.recv(1024) #read response
#print recvmsg
sock.close()

现在得到错误

Traceback (most recent call last):
  File "/mnt/sda1/udpgit.py", line 8, in <module>
    while ser.read() != 'A':
  File "/usr/lib/python2.7/site-packages/pyserial-2.7-py2.7.egg/serial/serialposix.py", line 475, in read
    raise SerialException('device reports readiness to read but returned no data (device disconnected or multiple access on port?)')
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

当 arduino 端有一个空白草图时，python 草图运行，但当我尝试使用 serial1 时，它会立即出现该错误。

我正在使用 Arduino Yun 尝试通过 wifi 与 Max 通信!谢谢!

Answer 1

克服无限循环所需的一切。你只想等到你得到一个 'A'，所以将条件从“始终为真”(1) 更改为“直到我们读到一个 'A'”

while ser.readline() != 'A':
    //do nothing

然后打开套接字

UDP_IP = "192.168.1.242"   #Uno IP address
UDP_PORT = 8888
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP

现在我们需要读取一个 arduino 读数，它由 8 个字节组成(每个读数都是一个 int，所以 2 个字节)，而且你没有写“行尾”字符(\n)所以 readLine()不会工作；

data_raw = read(8) #read 8 byte
sock.sendto(bytes(MESSAGE), (UDP_IP, UDP_PORT)) #send byte
recvmsg=sock.recv(1024) #read response messagge (are you sure aout this?)
print recvmsg

现在我们可以关闭套接字了。或循环下一个 8 字节，如果我们正在寻找另一个读数，只需循环上面的代码。

sock.close()