import serial
portx="COM5"
bps=9600
timex=5
#串口執(zhí)行到這已經(jīng)打開(kāi) 再用open命令會(huì)報(bào)錯(cuò)
ser = serial.Serial(portx, int(bps), timeout=1, parity=serial.PARITY_NONE,stopbits=1)
if (ser.isOpen()):
 print("open success")
 # 向端口些數(shù)據(jù) 字符串必須譯碼
 ser.write("hello".encode()) 
 while (True):
 line = ser.readline() 
 if(line):
  print(line)
  line=0
else:
 print("open failed")
ser.close()#關(guān)閉端口
)

import pyqtgraph as pg
import numpy as np
import array

app = pg.mkQApp()#建立app
win = pg.GraphicsWindow()#建立窗口
win.setWindowTitle(u'pyqtgraph逐點(diǎn)畫波形圖')
win.resize(800, 500)#小窗口大小

data = array.array('d') #可動(dòng)態(tài)改變數(shù)組的大小,double型數(shù)組
historyLength = 100#橫坐標(biāo)長(zhǎng)度
p = win.addPlot()#把圖p加入到窗口中
p.showGrid(x=True, y=True)#把X和Y的表格打開(kāi)
p.setRange(xRange=[0,historyLength], yRange=[-1.2, 1.2], padding=0)
p.setLabel(axis='left', text='y / V')#靠左
p.setLabel(axis='bottom', text='x / point')
p.setTitle('y = sin(x)')#表格的名字
curve = p.plot()#繪制一個(gè)圖形
idx = 0
def plotData():
 global idx#內(nèi)部作用域想改變外部域變量
 tmp = np.sin(np.pi / 50 * idx)
 if len(data)<historyLength:
 data.append(tmp)
 else:
 data[:-1] = data[1:]#前移
 data[-1] = tmp
 curve.setData(data)
 idx += 1

timer = pg.QtCore.QTimer()
timer.timeout.connect(plotData)#定時(shí)調(diào)用plotData函數(shù)
timer.start(50)#多少ms調(diào)用一次

app.exec_()

import array
import serial
import threading
import numpy as np
import time


i = 0
def Serial():
 while(True):
 n = mSerial.inWaiting()
 if(n):
  if data!=" ":
  dat = int.from_bytes(mSerial.readline(1),byteorder='little') # 格式轉(zhuǎn)換
  n=0
  global i;
  if i < historyLength:
   data[i] = dat
   i = i+1
  else:
   data[:-1] = data[1:]
   data[i-1] = dat

def plotData():
 curve.setData(data)


if __name__ == "__main__":
 app = pg.mkQApp() # 建立app
 win = pg.GraphicsWindow() # 建立窗口
 win.setWindowTitle(u'pyqtgraph逐點(diǎn)畫波形圖')
 win.resize(800, 500) # 小窗口大小
 data = array.array('i') # 可動(dòng)態(tài)改變數(shù)組的大小,double型數(shù)組
 historyLength = 200 # 橫坐標(biāo)長(zhǎng)度
 a = 0
 data=np.zeros(historyLength).__array__('d')#把數(shù)組長(zhǎng)度定下來(lái)
 p = win.addPlot() # 把圖p加入到窗口中
 p.showGrid(x=True, y=True) # 把X和Y的表格打開(kāi)
 p.setRange(xRange=[0, historyLength], yRange=[0, 255], padding=0)
 p.setLabel(axis='left', text='y / V') # 靠左
 p.setLabel(axis='bottom', text='x / point')
 p.setTitle('semg') # 表格的名字
 curve = p.plot() # 繪制一個(gè)圖形
 curve.setData(data)
 portx = 'COM24'
 bps = 19200
 # 串口執(zhí)行到這已經(jīng)打開(kāi) 再用open命令會(huì)報(bào)錯(cuò)
 mSerial = serial.Serial(portx, int(bps))
 if (mSerial.isOpen()):
 print("open success")
 mSerial.write("hello".encode()) # 向端口些數(shù)據(jù) 字符串必須譯碼
 mSerial.flushInput() # 清空緩沖區(qū)
 else:
 print("open failed")
 serial.close() # 關(guān)閉端口
 th1 = threading.Thread(target=Serial)#目標(biāo)函數(shù)一定不能帶（）被這個(gè)BUG搞了好久
 th1.start()
 timer = pg.QtCore.QTimer()
 timer.timeout.connect(plotData) # 定時(shí)刷新數(shù)據(jù)顯示
 timer.start(50) # 多少ms調(diào)用一次
 app.exec_()

import pyqtgraph as pg
import array
import serial
import threading
import numpy as np
from queue import Queue
import time


i = 0
q = Queue(maxsize=0)
def Serial():
 global i;
 global q;
 while(True):
 n = mSerial.inWaiting()
 if(n):
  dat = int.from_bytes(mSerial.readline(1),byteorder='little') # 格式轉(zhuǎn)換
  if(dat>>7):
  dat =256-dat
  dat =0-dat
  q.put(dat)

def plotData():
 global i;
 if i < historyLength:
 data[i] = q.get()
 i = i+1
 else:
 data[:-1] = data[1:]
 data[i-1] = q.get()
 curve.setData(data)


if __name__ == "__main__":
 app = pg.mkQApp() # 建立app
 win = pg.GraphicsWindow() # 建立窗口
 win.setWindowTitle(u'pyqtgraph逐點(diǎn)畫波形圖')
 win.resize(800, 500) # 小窗口大小
 data = array.array('i') # 可動(dòng)態(tài)改變數(shù)組的大小,double型數(shù)組
 historyLength = 100 # 橫坐標(biāo)長(zhǎng)度
 a = 0
 data=np.zeros(historyLength).__array__('d')#把數(shù)組長(zhǎng)度定下來(lái)
 p = win.addPlot() # 把圖p加入到窗口中
 p.showGrid(x=True, y=True) # 把X和Y的表格打開(kāi)
 p.setRange(xRange=[0, historyLength], yRange=[-50, 50], padding=0)
 p.setLabel(axis='left', text='y / V') # 靠左
 p.setLabel(axis='bottom', text='x / point')
 p.setTitle('semg') # 表格的名字
 curve = p.plot() # 繪制一個(gè)圖形
 curve.setData(data)
 portx = 'COM25'
 bps = 19200
 # 串口執(zhí)行到這已經(jīng)打開(kāi) 再用open命令會(huì)報(bào)錯(cuò)
 mSerial = serial.Serial(portx, int(bps))
 if (mSerial.isOpen()):
 dat = 0xff;
 dat >> 2;
 print("open success")
 # 向端口些數(shù)據(jù) 字符串必須譯碼
 mSerial.write("hello".encode())
 mSerial.flushInput() # 清空緩沖區(qū)
 else:
 print("open failed")
 serial.close() # 關(guān)閉端口
 th1 = threading.Thread(target=Serial)
 th1.start()
 timer = pg.QtCore.QTimer()
 timer.timeout.connect(plotData) # 定時(shí)刷新數(shù)據(jù)顯示
 timer.start(1) # 多少ms調(diào)用一次
 app.exec_()