Python автоматически выбирает последовательные порты (для Arduino)

В настоящее время программа python должна знать, к какому порту подключено устройство (Arduino), прежде чем Python сможет сообщить об этом устройству.

Проблема: Всякий раз, когда устройство подключается и возвращается в исходное состояние, его COM-порт изменяется, поэтому для его поиска нужно снова указать правильный последовательный порт для Python.

Как Python (используя pySerial) автоматически ищет правильный последовательный порт для использования? Возможно ли, чтобы python правильно идентифицировал устройство на последовательном порту как Arduino?

ОТВЕТЫ

Ответ 1

Используйте следующий код, чтобы просмотреть все доступные последовательные порты:

import serial.tools.list_ports
ports = list(serial.tools.list_ports.comports())
for p in ports:
    print p

Это дает мне следующее:

('COM4', 'Arduino Due Programming Port (COM4)', 'USB VID:PID=2341:003D SNR=75330303035351300230')
('COM11', 'RS-232 Port (COM11)', 'FTDIBUS\\VID_0856+PID_AC27+BBOPYNPPA\\0000')

Чтобы разработать, если это Arduino, вы можете сделать что-то вроде:

    if "Arduino" in p[1]:
        print "This is an Arduino!"

Ответ 2

Используя serial.tools.list_ports.comports, мы можем найти и подключиться к Arduino с помощью:

import warnings
import serial
import serial.tools.list_ports

arduino_ports = [
    p.device
    for p in serial.tools.list_ports.comports()
    if 'Arduino' in p.description  # may need tweaking to match new arduinos
]
if not arduino_ports:
    raise IOError("No Arduino found")
if len(arduino_ports) > 1:
    warnings.warn('Multiple Arduinos found - using the first')

ser = serial.Serial(arduino_ports[0])

Если вы знаете, что каждый раз ищите одно и то же p.serial_number вместо этого вы можете использовать p.serial_number

import serial.tools.list_ports

def find_arduino(serial_number):
    for pinfo in serial.tools.list_ports.comports():
        if pinfo.serial_number == serial_number:
            return serial.Serial(pinfo.device)
    raise IOError("Could not find an arduino - is it plugged in?")

ser = find_arduino(serial_number='85430353531351B09121')

Ответ 3

"""
Written on a Windows 10 Computer, Python 2.7.9 Version.

This program automatically detects and lists ports.  If no ports are found, it simply shells out.  In the printout below "list(serial.tools.list_ports.comports())" finds two ports and the program lists them out - a listout shown below:

     COM5 - USB-SERIAL CH340 (COM5)
     Found Arduino Uno on COM5
     COM4 - Microsoft USB GPS Port (COM4)

As each port is found, "CH340," (the name of the Adruino Uno) is searched for in the listed port with the "while int1 < 9:" loop.  The first "If" statement looks for "CH340" and when found the integer value "int1" will be the same as the com port #. With a concatination,  the operation "str1 = "COM" + str2" gives the com port name of the Adruino, eg. "COM5."  The next "IF" statement looks for both "CH340" AND str1, ("COM5") in the above case.  The statement "Found Arduino Uno on COM5" prints out, and "str1" is used in setting up the com port:

ser = serial.Serial(str1, 9600, timeout=10)

This program goes on to open the com port and prints data from the Adruino.

The modules "serial, sys, time, serial.tools.list_ports" must all be imported.

Written by Joseph F. Mack 01/29/2016.  "A BIG Thank you" to all the individuals whose programs I "borrowed" from that are available in the many forums for Python and PYGame users!
"""

import serial
import sys
import time
import serial.tools.list_ports

serPort = ""
int1 = 0
str1 = ""
str2 = ""

# Find Live Ports
ports = list(serial.tools.list_ports.comports())
for p in ports:
   print p # This causes each port information to be printed out.
           # To search this p data, use p[1].

   while int1 < 9:   # Loop checks "COM0" to "COM8" for Adruino Port Info. 

      if "CH340" in p[1]:  # Looks for "CH340" in P[1].
            str2 = str(int1) # Converts an Integer to a String, allowing:
            str1 = "COM" + str2 # add the strings together.

      if "CH340" in p[1] and str1 in p[1]: # Looks for "CH340" and "COM#"
         print "Found Arduino Uno on " + str1
         int1 = 9 # Causes loop to end.

      if int1 == 8:
         print "UNO not found!"
         sys.exit() # Terminates Script.

      int1 = int1 + 1

time.sleep(5)  # Gives user 5 seconds to view Port information -- can be   changed/removed.

# Set Port
ser = serial.Serial(str1, 9600, timeout=10) # Put in your speed and timeout value.

# This begins the opening and printout of data from the Adruino.

ser.close()  # In case the port is already open this closes it.
ser.open()   # Reopen the port.

ser.flushInput()
ser.flushOutput()

int1 = 0
str1 = ""
str2 = ""

while int1==0:

   if "\n" not in str1:        # concatinates string on one line till a line feed "\n"
      str2 = ser.readline()    # is found, then prints the line.
      str1 += str2
   print(str1)
   str1=""
   time.sleep(.1)

print 'serial closed'
ser.close()

Ответ 4

Надеюсь, это то, что вы нашли для..

ports = list(serial.tools.list_ports.comports())
        for p in ports:
            if "USB-SERIAL CH340" in p[1] and "4" in p[0]:
                print(p[1])
                with serial.Serial("COM4", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "2" in p[0]:
                print(p[1])
                with serial.Serial("COM2", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "3" in p[0]:
                print(p[1])
                with serial.Serial("COM3", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "4" in p[0]:
                print(p[1])
                with serial.Serial("COM4", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "5" in p[0]:
                print(p[1])
                with serial.Serial("COM5", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "6" in p[0]:
                print(p[1])
                with serial.Serial("COM6", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "7" in p[0]:
                print(p[1])
                with serial.Serial("COM7", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "8" in p[0]:
                print(p[1])
                with serial.Serial("COM8", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "9" in p[0]:
                print(p[1])
                with serial.Serial("COM9", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "10" in p[0]:
                print(p[1])
                with serial.Serial("COM10", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "11" in p[0]:
                print(p[1])
                with serial.Serial("COM11", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "12" in p[0]:
                print(p[1])
                with serial.Serial("COM12", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "13" in p[0]:
                print(p[1])
                with serial.Serial("COM13", 115200, timeout=1) as ser:
                    print(ser.readline())
            elif "USB-SERIAL CH340" in p[1] and "14" in p[0]:
                print(p[1])
                with serial.Serial("COM14", 115200, timeout=1) as ser:
                    print(ser.readline())
            else:
                print("Try Again!")

Ответ 5

Попробуйте этот код (только для пользователей Windows. Пользователь MAC может отказаться от этой концепции)

import serial
import time
list=['COM1','COM2','COM3','COM4','COM5','COM6','COM7','COM8','COM9','COM10','COM11','COM12','COM13','COM14','COM15','COM16','COM17','COM18',]



COM1='COM1'
COM2='COM2'
COM3='COM3'
COM4='COM4'
COM5='COM5'
COM6='COM6'
COM7='COM7'
COM8='COM8'
COM9='COM9'
COM10='COM10'
COM11='COM11'
COM12='COM12'
COM13='COM13'
COM14='COM14'
COM15='COM15'
COM16='COM16'
COM17='COM17'
COM18='COM18'
COM19='COM19'
time.sleep(1)
ser = serial.Serial()

ser.baudrate = 9600

i=1

while True:
    time.sleep(.2)
    print(i)
    ser.port = list[i]
    try:

        ser.open()
        if ser.isOpen()==True:
            print('connected')
            #print('arduino is on COMPORT'.join(i))
            break
        break

    except:
        print('waiting')
        i=i+1
        if i==18:
            print('Kindly remove usb cable and try again')
            break


print('here we go')
while True:
    print(ser.readline())