我有一个连接到按钮的arduino。按下按钮时,串行输出1的串行输出。我希望按下按钮时启动python tkinter秒表。目前我知道1正在被python串行读取读取。并在python终端打印出来。但我无法控制tkinter秒表。 PS:我对python很新。下面是我目前的代码。
from tkinter import *
import time
import serial
ser = serial.Serial(
port='COM4',\
baudrate=57600,\
parity=serial.PARITY_NONE,\
stopbits=serial.STOPBITS_ONE,\
bytesize=serial.EIGHTBITS,\
timeout=10)
print("connected to: " + ser.portstr)
class StopWatch(Frame):
""" Implements a stop watch frame widget. """
def __init__(self, parent=None, **kw):
Frame.__init__(self, parent, kw)
self._start = 0.0
self._elapsedtime = 0.0
self._running = 0
self.timestr = StringVar()
self.makeWidgets()
def makeWidgets(self):
""" Make the time label. """
l = Label(self, textvariable=self.timestr)
self._setTime(self._elapsedtime)
l.pack(fill=X, expand=NO, pady=2, padx=2)
def _update(self):
""" Update the label with elapsed time. """
self._elapsedtime = time.time() - self._start
self._setTime(self._elapsedtime)
self._timer = self.after(50, self._update)
def _setTime(self, elap):
""" Set the time string to Minutes:Seconds:Hundreths """
minutes = int(elap/60)
seconds = int(elap - minutes*60.0)
hseconds = int((elap - minutes*60.0 - seconds)*100)
self.timestr.set('%02d:%02d:%02d' % (minutes, seconds, hseconds))
def Start(self):
""" Start the stopwatch, ignore if running. """
if not self._running:
self._start = time.time() - self._elapsedtime
self._update()
self._running = 1
def Stop(self):
""" Stop the stopwatch, ignore if stopped. """
if self._running:
self.after_cancel(self._timer)
self._elapsedtime = time.time() - self._start
self._setTime(self._elapsedtime)
self._running = 0
def Reset(self):
""" Reset the stopwatch. """
self._start = time.time()
self._elapsedtime = 0.0
self._setTime(self._elapsedtime)
def main():
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
root.mainloop()
if __name__ == '__main__':
main()
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
count=1
while True:
for line in ser.read():
print(chr(line))
count = count+1
if chr(line) == '1':
sw.Start()
ser.close()
编辑:按照评论回答我已经有了它的工作。下面是工作代码。
from tkinter import *
import time
import serial
class StopWatch(Frame):
""" Implements a stop watch frame widget. """
def __init__(self, parent=None, **kw):
Frame.__init__(self, parent, kw)
self._start = 0.0
self._elapsedtime = 0.0
self._running = 0
self.timestr = StringVar()
self.makeWidgets()
def makeWidgets(self):
""" Make the time label. """
l = Label(self, textvariable=self.timestr)
self._setTime(self._elapsedtime)
l.pack(fill=X, expand=NO, pady=2, padx=2)
def _update(self):
""" Update the label with elapsed time. """
self._elapsedtime = time.time() - self._start
self._setTime(self._elapsedtime)
self._timer = self.after(50, self._update)
def _setTime(self, elap):
""" Set the time string to Minutes:Seconds:Hundreths """
minutes = int(elap/60)
seconds = int(elap - minutes*60.0)
hseconds = int((elap - minutes*60.0 - seconds)*100)
self.timestr.set('%02d:%02d:%02d' % (minutes, seconds, hseconds))
def Start(self):
""" Start the stopwatch, ignore if running. """
if not self._running:
self._start = time.time() - self._elapsedtime
self._update()
self._running = 1
def Stop(self):
""" Stop the stopwatch, ignore if stopped. """
if self._running:
self.after_cancel(self._timer)
self._elapsedtime = time.time() - self._start
self._setTime(self._elapsedtime)
self._running = 0
def Reset(self):
""" Reset the stopwatch. """
self._start = time.time()
self._elapsedtime = 0.0
self._setTime(self._elapsedtime)
def Read():
ser = serial.Serial(
port='COM4',\
baudrate=57600,\
parity=serial.PARITY_NONE,\
stopbits=serial.STOPBITS_ONE,\
bytesize=serial.EIGHTBITS,\
timeout=10)
print("connected to: " + ser.portstr)
count=1
while True:
for line in ser.read():
print(chr(line))
count = count+1
return chr(line)
ser.close()
def main():
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
ser = Read()
if ser == '1':
sw.Start()
root.mainloop()
if __name__ == '__main__':
main()
答案 0 :(得分:1)
您main()
和if __name__
语句有点破碎。
根据我在代码中看到的内容,您的代码将无法运行。
您应该只创建一个Tk()
实例,并在您的代码中将其写入两次。
请注意,root.mainloop()
之后编写的任何代码都不会在mainloop()
结束后运行。此时,您的程序将被关闭,并且由于main()
声明的其余部分,将创建一个新实例。
这可能不是你的意图。
此:
def main():
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
root.mainloop()
if __name__ == '__main__':
main()
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
count=1
while True:
for line in ser.read():
print(chr(line))
count = count+1
if chr(line) == '1':
sw.Start()
ser.close()
应该是这样的:
def main():
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
count=1
while True:
for line in ser.read():
print(chr(line))
count = count+1
if chr(line) == '1':
sw.Start()
ser.close()
root.mainloop()
if __name__ == '__main__':
main()
这不是尝试回答你的整体问题,因为我还没有详细查看你的所有代码,但是我很难将其写在评论中,所以我在这里写了。
更新:
我无法在任何与串行相关的代码上测试您的代码,但我修改了for循环以测试代码的功能。话虽如此,我相信您希望在ser = serial.Serial()
循环之前将main()
的内容移动到while
函数中。也许你应该稍微更改while循环语句。目前语句while True:
将永远运行。
而是使用这样的东西。
x = True
while x == True:
# do stuff
x = False
sw.Start()
最后我认为你的代码应该是这样的:
from tkinter import *
import time
import serial
class StopWatch(Frame):
""" Implements a stop watch frame widget. """
def __init__(self, parent=None, **kw):
Frame.__init__(self, parent, kw)
self._start = 0.0
self._elapsedtime = 0.0
self._running = 0
self.timestr = StringVar()
self.makeWidgets()
def makeWidgets(self):
""" Make the time label. """
l = Label(self, textvariable=self.timestr)
self._setTime(self._elapsedtime)
l.pack(fill=X, expand=NO, pady=2, padx=2)
def _update(self):
""" Update the label with elapsed time. """
self._elapsedtime = time.time() - self._start
self._setTime(self._elapsedtime)
self._timer = self.after(50, self._update)
def _setTime(self, elap):
""" Set the time string to Minutes:Seconds:Hundreths """
minutes = int(elap/60)
seconds = int(elap - minutes*60.0)
hseconds = int((elap - minutes*60.0 - seconds)*100)
self.timestr.set('%02d:%02d:%02d' % (minutes, seconds, hseconds))
def Start(self):
""" Start the stopwatch, ignore if running. """
if not self._running:
self._start = time.time() - self._elapsedtime
self._update()
self._running = 1
def Stop(self):
""" Stop the stopwatch, ignore if stopped. """
if self._running:
self.after_cancel(self._timer)
self._elapsedtime = time.time() - self._start
self._setTime(self._elapsedtime)
self._running = 0
def Reset(self):
""" Reset the stopwatch. """
self._start = time.time()
self._elapsedtime = 0.0
self._setTime(self._elapsedtime)
def main():
root = Tk()
sw = StopWatch(root)
sw.pack(side=TOP)
ser = serial.Serial(
port='COM4',\
baudrate=57600,\
parity=serial.PARITY_NONE,\
stopbits=serial.STOPBITS_ONE,\
bytesize=serial.EIGHTBITS,\
timeout=10)
x = True
count=1
while x == True:
for line in ser.read():
print(chr(line))
count = count+1
if chr(line) == '1':
sw.Start()
root.mainloop()
if __name__ == '__main__':
main()