Question

尝试使用pyfirmata库使用交互式滑块打开LED。我只是想使用滑块将其关闭或打开。这是我的代码（我不知道我做错了什么）：

import pyfirmata
import time
from ipywidgets import widgets, interact
import ipywidgets as widgets
from IPython.display import display

pin=9
port='com5'
board = pyfirmata.Arduino(port)

def ledON():
    board.digital[pin].write(1)

def ledOFF():
    board.digital[pin].write(0)

def runit(LED=ledwidget.result):
    if LED == 1:
        ledON()
    elif LED == 0:
        ledOFF()
    return(LED)


slider = widgets.IntSlider(value=0,min=0,max=1,step=1)
ledwidget = widgets.interactive (runit,a=slider)
display(ledwidget)
board.exit()

这是帮助调试的堆栈错误跟踪，但由于我无法将所有堆栈发布到此处，因此我不得不削减大部分内容：

SerialException                           Traceback (most recent call last) <ipython-input-115-6a0aba5925b9> in runit(LED)
     19         ledON()
     20     elif LED == 0:
---> 21         ledOFF()
     22     return(LED)
     23 

<ipython-input-115-6a0aba5925b9> in ledOFF()
     13 
     14 def ledOFF():
---> 15     board.digital[pin].write(0)
     16 
     17 def runit(LED=ledwidget.result):

C:\Users\trinh\Anaconda3\lib\site-packages\pyfirmata\pyfirmata.py in write(self, value)
    531             if self.mode is OUTPUT:
    532                 if self.port:
--> 533                     self.port.write()
    534                 else:
    535                     msg = bytearray([DIGITAL_MESSAGE, self.pin_number, value])


C:\Users\trinh\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py in run_code(self, code_obj, result)    2879                 self.hooks.pre_run_code_hook()    2880                
#rprint('Running code', repr(code_obj)) # dbg
-> 2881                 exec(code_obj, self.user_global_ns, self.user_ns)    2882             finally:    2883                 # Reset our crash handler in place


C:\Users\trinh\Anaconda3\lib\site-packages\serial\serialwin32.py in write(self, data)
    302         """Output the given byte string over the serial port."""
    303         if not self.is_open:
--> 304             raise portNotOpenError
    305         #~ if not isinstance(data, (bytes, bytearray)):
    306             #~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))

SerialException: Attempting to use a port that is not open

交互式滑块使用pyfirmata打开LED

0 个答案: