Question

I'm trying to use pyfirmata to send and receive data between Arduino Uno R3 and my python program. At Arduino installed StandartFirmata sketch. Code is:

from time import sleep
import serial
import pyfirmata
com_port_number = str(int(input('Введите номер COM-порта ')))
port = 'COM' + com_port_number   # COM port number
print('Выбран порт COM ', port)
try:
        board = pyfirmata.Arduino(port)
except serial.SerialException:
        print('Не удается подключится к выбранному COM-порту')
        com_port_number = str(int(input('Введите номер СОМ-порта')))
        port = 'COM' + com_port_number
        board = pyfirmata.Arduino(port)
sleep(1)
it = pyfirmata.util.Iterator(board)
it.start()
temp_list = []
potentiomentr = board.get_pin('a:0:o')
acid_control = board.get_pin('a:2:o')
stock_control = board.get_pin('a:3:o')
temperature_pin = board.get_pin('d:4:i')    # well, this line is worked fine. Temperature sensor works correctly
in_connection_pc = board.get_pin('d:0:o')   #but now i have InvalidPinDefError
triac = board.get_pin('d:6:o')
level = board.get_pin('d:8:i')
in_engine = board.get_pin('d:5:o')
in_triac = board.get_pin('d:10:o')
in_pump = board.get_pin('d:11:o')
drive_control = board.get_pin('d:12:o')
pump_control = board.get_pin('d:13:o')
while 1:   # бесконечный цикл
    a = temperature_pin.read()
    b = in_connection_pc.write(1)
    print(a)
    list.append(a,b)
    print(list)
    sleep(3)
board.exit()

But i have some strange mistake:

Traceback (most recent call last):
  File "C:/Users/lomil/PycharmProjects/Pyython_and_CSV_love/test_analog.py", line 22, in <module>
    in_connection_pc = board.get_pin('d:0:i')   #but now i have InvalidPinDefError??
  File "C:\Users\lomil\Python_32\lib\site-packages\pyfirmata\pyfirmata.py", line 220, in get_pin
    raise InvalidPinDefError('Invalid pin definition: UNAVAILABLE pin {0} at position on {1}'.format(pin_def, self.name))
pyfirmata.pyfirmata.InvalidPinDefError: Invalid pin definition: UNAVAILABLE pin d:0:i at position on COM1

When I commented all lines except

temperature_pin = board.get_pin('d:4:i')

It worked, but I can not understand what's wrong with other pins. They are totally good and worked fine when I wrote test sketch to Arduino.

Answer 1

错误消息实际上是在抱怨：UNAVAILABLE pin d:0:i at position on COM1。在Arduino Uno（和大多数Arduinos）digital pins 0 and 1 are dual-use pins and are also used for communications over the serial port, aka COM port。

Firmata不断通过串口进行通信，因此在使用Firmata时，您无法将数字引脚0和1用于其他任何事情。

因此无论您在数字引脚0上插入Arduino的电线是什么，都需要移动到另一个未使用的数字引脚，如引脚3.因此，如果您将该线连接到数字引脚3，那么在代码中您现在需要in_connection_pc = board.get_pin('d:3:o')。

InvalidPinDefError at the moment of definition the pins

1 个答案: