如何在 python 中等待关闭的端口
How to wait for a closed port in python
我使用 INA219 传感器和 Arduino 制作了一个跟踪电池放电电压的设备，Arduino 收集的信息然后发送到串行通信中的 Raspberry pi，目的是 python coding 和 matplotlib，drawnow 模块，输出将实时绘制在 LCD 上，
我已经为 Arduino 设置了一个看门狗功能，如果它无论如何冻结都会重置，但与此同时，我如何使用 pyserial 模块等待关闭的端口再次打开而不被终止？
在下面你可以看到我的 python 代码：
import serial
from datetime import datetime, timedelta
import matplotlib.pyplot as plt
from matplotlib.ticker import AutoMinorLocator
from matplotlib.dates import AutoDateLocator, AutoDateFormatter
from drawnow import *
#import csv
Voltage_0 = [0]
Current_0 = [0]
ResInt_0 = [0]
Power_0 = [0]
Voltage_1 = [0]
Current_1 = [0]
ResInt_1 = [0]
Power_1 = [0]
Voltage_4 = [0]
Current_4 = [0]
ResInt_4 = [0]
Power_4 = [0]
Voltage_5 = [0]
Current_5 = [0]
ResInt_5 = [0]
Power_5 = [0]
Time = []
StartTime = 0
PlotTime = 0
PresentTime = 0
i = 0
if __name__ == '__main__':
arduino = serial.Serial('/dev/ttyUSB0', 115200, timeout=1)
plt.ion()
StartTime = datetime.now()
h = StartTime.hour
m = StartTime.minute
s = StartTime.second
PresentTime = StartTime + timedelta(seconds=5)
PlotTime = PresentTime - timedelta(hours= h,minutes= m, seconds= s)
Time.append(PlotTime)
def CreatePlot():
plt.suptitle('Type AA Battery Discharge Window')
ax0 = plt.subplot(2,2,1)
plt.grid(True)
plt.plot(Time, Voltage_0,'#ff0400', label='V0')
ax0.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax0.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax0.xaxis.set_major_formatter(formatter)
ax0.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax0.label_outer()
ax1 = plt.subplot(2,2,2)
plt.grid(True)
plt.plot(Time, Voltage_1,'#ffaa00', label='V1')
ax1.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax1.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax1.xaxis.set_major_formatter(formatter)
ax1.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax1.label_outer()
ax2 = plt.subplot(2,2,3)
plt.grid(True)
plt.plot(Time,Voltage_4, '#fff200', label='V4')
ax2.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax2.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax2.xaxis.set_major_formatter(formatter)
ax2.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax2.label_outer()
ax3 = plt.subplot(2,2,4)
plt.grid(True)
plt.plot(Time,Voltage_5, '#0af219', label='V5')
ax3.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax3.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax3.xaxis.set_major_formatter(formatter)
ax3.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax3.label_outer()
while True:
if arduino.in_waiting > 0:
arduinoString = arduino.readline().decode('UTF-8').rstrip()
PresentTime = datetime.now()
dataArray = arduinoString.split(',')
vol_0 = float( dataArray[0])
cur_0 = float( dataArray[1])
res_0 = float( dataArray[2])
pow_0 = float( dataArray[3])
Voltage_0.append(vol_0)
Current_0.append(cur_0)
ResInt_0.append(res_0)
Power_0.append(pow_0)
vol_1 = float( dataArray[4])
cur_1 = float( dataArray[5])
res_1 = float( dataArray[6])
pow_1 = float( dataArray[7])
Voltage_1.append(vol_1)
Current_1.append(cur_1)
ResInt_1.append(res_1)
Power_1.append(pow_1)
vol_4 = float( dataArray[8])
cur_4 = float( dataArray[9])
res_4 = float( dataArray[10])
pow_4 = float( dataArray[11])
Voltage_4.append(vol_4)
Current_4.append(cur_4)
ResInt_4.append(res_4)
Power_4.append(pow_4)
vol_5 = float( dataArray[12])
cur_5 = float( dataArray[13])
res_5 = float( dataArray[14])
pow_5 = float( dataArray[15])
Voltage_5.append(vol_5)
Current_5.append(cur_5)
ResInt_5.append(res_5)
Power_5.append(pow_5)
ArdTime = float( dataArray[16])
PlotTime = PresentTime - timedelta(hours= h,minutes= m, seconds= s)
Time.append(PlotTime)
with open('AA_OUTPUT.csv', 'a') as f:
if i==0:
f.write('Time,Voltage_0 (V),Current_0 (mA), Internal Resistance_0 (mohm), Power_0 (mW),'
'Voltage_1 (V),Current_1 (mA), Internal Resistance_1 (mohm), Power_1 (mW),'
'Voltage_4 (V),Current_4 (mA), Internal Resistance_4 (mohm), Power_4 (mW),'
'Voltage_5 (V),Current_5 (mA), Internal Resistance_5 (mohm), Power_5 (mW)\n')
f.write('{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}\n'.format(ArdTime,
Voltage_0[-1],Current_0[-1],ResInt_0[-1],Power_0[-1],
Voltage_1[-1],Current_1[-1],ResInt_1[-1],Power_1[-1],
Voltage_4[-1],Current_4[-1],ResInt_4[-1],Power_4[-1],
Voltage_5[-1],Current_5[-1],ResInt_5[-1],Power_5[-1])) #for Python2 users
i+=1
else:
#f.write(f'{PlotTime},{vol_0},{cur_0},{res_0},{pow_0},{vol_1},{cur_1},{res_1},
# {pow_1},{vol_4},{cur_4},{res_4},{pow_4},{vol_5},{cur_5},{res_5},{pow_5}\n') #for Python3 users
f.write('{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}\n'.format(ArdTime,
Voltage_0[-1],Current_0[-1],ResInt_0[-1],Power_0[-1],
Voltage_1[-1],Current_1[-1],ResInt_1[-1],Power_1[-1],
Voltage_4[-1],Current_4[-1],ResInt_4[-1],Power_4[-1],
Voltage_5[-1],Current_5[-1],ResInt_5[-1],Power_5[-1])) #for Python2 users
drawnow(CreatePlot)
plt.pause(0.0001)
is_open 来自 pySerial 模块可用于检索它的当前状态。
while True:
if arduino.is_open:
if arduino.in_waiting > 0:
# rest of your code
drawnow(CreatePlot)
plt.pause(0.0001)
else:
arduino.open()
我使用 INA219 传感器和 Arduino 制作了一个跟踪电池放电电压的设备，Arduino 收集的信息然后发送到串行通信中的 Raspberry pi，目的是 python coding 和 matplotlib，drawnow 模块，输出将实时绘制在 LCD 上， 我已经为 Arduino 设置了一个看门狗功能，如果它无论如何冻结都会重置，但与此同时，我如何使用 pyserial 模块等待关闭的端口再次打开而不被终止？ 在下面你可以看到我的 python 代码：
import serial
from datetime import datetime, timedelta
import matplotlib.pyplot as plt
from matplotlib.ticker import AutoMinorLocator
from matplotlib.dates import AutoDateLocator, AutoDateFormatter
from drawnow import *
#import csv
Voltage_0 = [0]
Current_0 = [0]
ResInt_0 = [0]
Power_0 = [0]
Voltage_1 = [0]
Current_1 = [0]
ResInt_1 = [0]
Power_1 = [0]
Voltage_4 = [0]
Current_4 = [0]
ResInt_4 = [0]
Power_4 = [0]
Voltage_5 = [0]
Current_5 = [0]
ResInt_5 = [0]
Power_5 = [0]
Time = []
StartTime = 0
PlotTime = 0
PresentTime = 0
i = 0
if __name__ == '__main__':
arduino = serial.Serial('/dev/ttyUSB0', 115200, timeout=1)
plt.ion()
StartTime = datetime.now()
h = StartTime.hour
m = StartTime.minute
s = StartTime.second
PresentTime = StartTime + timedelta(seconds=5)
PlotTime = PresentTime - timedelta(hours= h,minutes= m, seconds= s)
Time.append(PlotTime)
def CreatePlot():
plt.suptitle('Type AA Battery Discharge Window')
ax0 = plt.subplot(2,2,1)
plt.grid(True)
plt.plot(Time, Voltage_0,'#ff0400', label='V0')
ax0.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax0.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax0.xaxis.set_major_formatter(formatter)
ax0.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax0.label_outer()
ax1 = plt.subplot(2,2,2)
plt.grid(True)
plt.plot(Time, Voltage_1,'#ffaa00', label='V1')
ax1.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax1.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax1.xaxis.set_major_formatter(formatter)
ax1.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax1.label_outer()
ax2 = plt.subplot(2,2,3)
plt.grid(True)
plt.plot(Time,Voltage_4, '#fff200', label='V4')
ax2.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax2.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax2.xaxis.set_major_formatter(formatter)
ax2.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax2.label_outer()
ax3 = plt.subplot(2,2,4)
plt.grid(True)
plt.plot(Time,Voltage_5, '#0af219', label='V5')
ax3.set(xlabel='Time', ylabel='Voltage')
plt.legend(loc='upper center')
plt.subplots_adjust(wspace=0.05, hspace=0.07)
locator = AutoDateLocator()
ax3.xaxis.set_major_locator(locator)
formatter = AutoDateFormatter(locator)
ax3.xaxis.set_major_formatter(formatter)
ax3.xaxis.set_minor_locator(AutoMinorLocator())
plt.xticks(rotation=45, ha='right')
plt.subplots_adjust(bottom=0.30)
plt.ylim(0,1.7)
ax3.label_outer()
while True:
if arduino.in_waiting > 0:
arduinoString = arduino.readline().decode('UTF-8').rstrip()
PresentTime = datetime.now()
dataArray = arduinoString.split(',')
vol_0 = float( dataArray[0])
cur_0 = float( dataArray[1])
res_0 = float( dataArray[2])
pow_0 = float( dataArray[3])
Voltage_0.append(vol_0)
Current_0.append(cur_0)
ResInt_0.append(res_0)
Power_0.append(pow_0)
vol_1 = float( dataArray[4])
cur_1 = float( dataArray[5])
res_1 = float( dataArray[6])
pow_1 = float( dataArray[7])
Voltage_1.append(vol_1)
Current_1.append(cur_1)
ResInt_1.append(res_1)
Power_1.append(pow_1)
vol_4 = float( dataArray[8])
cur_4 = float( dataArray[9])
res_4 = float( dataArray[10])
pow_4 = float( dataArray[11])
Voltage_4.append(vol_4)
Current_4.append(cur_4)
ResInt_4.append(res_4)
Power_4.append(pow_4)
vol_5 = float( dataArray[12])
cur_5 = float( dataArray[13])
res_5 = float( dataArray[14])
pow_5 = float( dataArray[15])
Voltage_5.append(vol_5)
Current_5.append(cur_5)
ResInt_5.append(res_5)
Power_5.append(pow_5)
ArdTime = float( dataArray[16])
PlotTime = PresentTime - timedelta(hours= h,minutes= m, seconds= s)
Time.append(PlotTime)
with open('AA_OUTPUT.csv', 'a') as f:
if i==0:
f.write('Time,Voltage_0 (V),Current_0 (mA), Internal Resistance_0 (mohm), Power_0 (mW),'
'Voltage_1 (V),Current_1 (mA), Internal Resistance_1 (mohm), Power_1 (mW),'
'Voltage_4 (V),Current_4 (mA), Internal Resistance_4 (mohm), Power_4 (mW),'
'Voltage_5 (V),Current_5 (mA), Internal Resistance_5 (mohm), Power_5 (mW)\n')
f.write('{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}\n'.format(ArdTime,
Voltage_0[-1],Current_0[-1],ResInt_0[-1],Power_0[-1],
Voltage_1[-1],Current_1[-1],ResInt_1[-1],Power_1[-1],
Voltage_4[-1],Current_4[-1],ResInt_4[-1],Power_4[-1],
Voltage_5[-1],Current_5[-1],ResInt_5[-1],Power_5[-1])) #for Python2 users
i+=1
else:
#f.write(f'{PlotTime},{vol_0},{cur_0},{res_0},{pow_0},{vol_1},{cur_1},{res_1},
# {pow_1},{vol_4},{cur_4},{res_4},{pow_4},{vol_5},{cur_5},{res_5},{pow_5}\n') #for Python3 users
f.write('{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}\n'.format(ArdTime,
Voltage_0[-1],Current_0[-1],ResInt_0[-1],Power_0[-1],
Voltage_1[-1],Current_1[-1],ResInt_1[-1],Power_1[-1],
Voltage_4[-1],Current_4[-1],ResInt_4[-1],Power_4[-1],
Voltage_5[-1],Current_5[-1],ResInt_5[-1],Power_5[-1])) #for Python2 users
drawnow(CreatePlot)
plt.pause(0.0001)
is_open 来自 pySerial 模块可用于检索它的当前状态。
while True:
if arduino.is_open:
if arduino.in_waiting > 0:
# rest of your code
drawnow(CreatePlot)
plt.pause(0.0001)
else:
arduino.open()