Python 读取串口数据,动态绘图的示例_Python

Python 读取串口数据,动态绘图的示例

2021-07-28 00:46happyliuliming Python

今天小编就为大家分享一篇Python 读取串口数据,动态绘图的示例，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧

最近工作需要把单片机读取的传感器电压数据实时在PC上通过曲线显示出来，刚好在看python, 就试着用了python 与uart端口通讯，并且通过matplotlib.pyplot 模块实时绘制图形出来。

1. 废话少说，上图

Python 读取串口数据,动态绘图的示例

因为没有UI，运行时需要在提示符下输入串口相关参数，com端口，波特率...

Python 读取串口数据,动态绘图的示例

代码如下：

				?

									#-*- coding: utf-8 -*-

									# 串口测试程序

									import serial

									import matplotlib.pyplot as plt

									import numpy as np

									import time

									import re

									# User input comport and bundrate

									comport = input('Please input comport (like COM3) for your connected device: ')

									baudrate = input('Please input baudrate (like 9600) for your connected device: ')

									bytes = input('Please input bytes type of uart data (1->1 byte, 2->2 bytes): ')

									bytes = int(bytes)

									print('You selected %s, baudrate %d, %d byte.' % (comport, int(baudrate), bytes))

									serialport = serial.Serial(comport, int(baudrate), timeout=1, parity=serial.PARITY_EVEN, rtscts=1)

									if serialport.isOpen():

									    print("open success")

									else:

									    print("open failed")

									plt.grid(True) # 添加网格

									plt.ion()   # interactive mode

									plt.figure(1)

									plt.xlabel('times')

									plt.ylabel('data')

									plt.title('Diagram of UART data by Python')

									t = [0]

									m = [0]

									i = 0

									intdata = 0

									data = ''

									count = 0

									while True:

									    if i > 300:  # 300次数据后，清除画布，重新开始，避免数据量过大导致卡顿。

									        t = [0]

									        m = [0]

									        i = 0

									        plt.cla()

									    count = serialport.inWaiting()

									    if count > 0 :

									        if (bytes == 1):

									            data = serialport.read(1)

									        elif (bytes == 2):

									            data = serialport.read(2)

									        if data !='':

									            intdata = int.from_bytes(data, byteorder='big', signed = False)

									            print('%d byte data %d' % (bytes, intdata))

									            i = i+1

									            t.append(i)

									            m.append(intdata)

									            plt.plot(t, m, '-r')   

									            # plt.scatter(i, intdata)

									            plt.draw()

									    plt.pause(0.002)