PYQT编写一个电压数据采集界面_python 采集电压

二话不说先上效果图：

 开发流程：

1、电压采集

 使用某宝上电压采集模块，该模块支持RS485连接上位机；

根据采集模块Moubus通讯规则，使用python 编写获取电压值，上代码

# encoding: utf-8
'''
@author: halen.li
@contact: 1056008549@qq.com
@file: GET_V.py
@time: 2021/6/26 0026 8:05
@desc:
'''
import serial
import serial.tools.list_ports
import re
from time import sleep
import struct
 
def GetCom():
    port_list=list(serial.tools.list_ports.comports())
    if len(port_list)==0:
        print("NO Find COM Port")
    else:
        for i in range(0,len(port_list)):
            matchport = re.match(r'(.*) - USB-SERIAL (.*?).*',str(port_list[i]),re.M|re.I)
            return (matchport.group(1))
 
 
def OpenCom(portx):
    try:
        ser = serial.Serial(portx, 9600, timeout=1)
        if (ser.is_open):
            WritePort(ser)
            sleep(0.1)
            len_return_data = ser.inWaiting()
            if len_return_data:
                return_data = ser.read(len_return_data)
                str_return_data = str(return_data.hex())
                voltage_data = str_return_data[6:14]
                result = struct.unpack('!f', bytes.fromhex(voltage_data))[0]
                ser.close()
                return(round(result,3))
        ser.close()
    except Exception as e:
        print("Open com error:",e)
def WritePort(ser):
    data = '01 03 00 00 00 02 C4 0B'
    send_data = bytes.fromhex(data)
    ser.write(send_data)
 
def GetVoltage():
    portx = GetCom()
    Vol = []
    while True:
        Vol_v = OpenCom(portx)
        if Vol_v != None and Vol_v > 0.1:
            Vol.append(Vol_v)
            if len(Vol) == 5:
                break
        else:
            break
    return Vol

2、界面开发

使用QtDesigner设计界面