Python reads the serial port data and stores it into the database

Can't be bothered 2020-11-11 11:22:48
python reads serial port data


I did a small project of Internet of things before , Need to get through SCM and server . The data of MCU should be transferred to the cloud server . My plan is to transmit the MCU serial port to the local computer , The local computer is then transferred to the cloud mysql The server . There are many languages that can do this , Because I just learned python, So I chose to use python Read the serial port data from MCU to local computer , After filtering, the serial data is formatted and stored in the cloud mysql Database . Here's the code section .

 1 #create by Feng
 2 # coding=UTF-8
 3 import serial
 4 import pymysql
 5 import datetime
 6
 7 def clean_spaces(s): # Filter out line breaks and spaces 
 8 s = s.replace('\r', '')
 9 s = s.replace('\t', '')
10 s = s.replace('\f', '')
11 s = s.replace('\n', '')
12 return s
13
14 def transp_bytes(b):
15 barr = bytearray(b)
16 str = barr.decode()
17 return str
18
19 def mySplit(s, ds):
20 res = [s]
21 # Loop through all the splitters 
22 for d in ds:
23 t = []
24 # must do list Only after a while can we use it correctly 
25 res2 = list(map(lambda x: t.extend(x.split(d)), res))
26 # print(res2)
27 res = t
28 # Filter out empty strings 
29 return [x for x in res if x] # Return to one list
30 # usage :r = mySplit(s1, 'C%L')
31 # print('r', r) 
32
33 db = pymysql.connect(' database ip',user = " Database user name ",passwd = " Database password ",db = " Database name ") # Open database connection 
34 cursor = db.cursor() # Get database cursor 
35 serial = serial.Serial('COM3', 19200) # Set the serial port and baud rate 
36 print(serial)
37 if serial.isOpen(): # Opening a serial port 
38 print("open success")
39 else:
40 print("open failed")
41
42 try:
43 temp = '1'
44 humi = '23'
45 light = '0'
46 date="1111"
47 n = 0
48 #sql = "insert into serial(temp,humi,light) values ('"+temp+"','"+humi+"','"+light+"')"
49 while True:
50 count = serial.inWaiting()
51 if count > 0:
52 data = serial.read(count) # Receiving serial port 
53 #a = data
54 data = clean_spaces(transp_bytes(data)) # Filter newlines 、 enter 
55 li = []
56 li = mySplit(data,'C%L') # Character segmentation 
57 time = datetime.datetime.now().strftime('%Y%m%d%H%M%S') # Acquisition time 
58 try: # exception handling 
59 sql= "insert into serial(temp,humi,light,time) values ('"+li[0]+"','"+li[1]+"','"+li[2]+"','"+time+"')"
60 #print("indexError,but do worry!") 
61  cursor.execute(sql)
62 cursor.connection.commit() # Submit 
63 print("three data was gain") # Data upload succeeded 
64 except IndexError:
65 print("indexError,but do worry")
66 except KeyboardInterrupt:
67 if serial != None:
68 serial.close()

 

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