最近工作需要把單片機(jī)讀取的傳感器電壓數(shù)據(jù)實(shí)時(shí)在PC上通過(guò)曲線(xiàn)顯示出來(lái)，剛好在看python, 就試著用了python 與uart端口通訊，并且通過(guò)matplotlib.pyplot 模塊實(shí)時(shí)繪制圖形出來(lái)。

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1. 廢話(huà)少說(shuō)，上圖

因?yàn)闆](méi)有UI，運(yùn)行時(shí)需要在提示符下輸入串口相關(guān)參數(shù)，com端口，波特率...

代碼如下：

#-*- coding: utf-8 -*-
 
# 串口測(cè)試程序
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) # 添加網(wǎng)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次數(shù)據(jù)后，清除畫(huà)布，重新開(kāi)始，避免數(shù)據(jù)量過(guò)大導(dǎo)致卡頓。
		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)

標(biāo)題名稱(chēng)：Python讀取串口數(shù)據(jù),動(dòng)態(tài)繪圖的示例-創(chuàng)新互聯(lián)
轉(zhuǎn)載來(lái)于：http://weahome.cn/article/cdoieo.html