0

我在此代码中收到“无法将字符串转换为浮点数”错误。任何人都可以看看有什么问题吗？我正在使用来自 sparkfun 的 FTDI 连接到 PC 的 9DOF Razor IMU。我试图在旋转剃刀时查看轴 x、y 和 z 以及偏航、俯仰和滚动杆移动，但我收到此错误。这是我从事的第一个项目，所以我所做的一切都是基于教程和博客。英语不是我的母语，所以很抱歉我犯了任何英语错误。谢谢你。

# This script needs VPhyton, pyserial and pywin modules


from visual import *
import serial
import string
import math

from time import time

grad2rad = 3.141592/180.0

# Check your COM port and baud rate
ser = serial.Serial(port='COM13',baudrate=57600, timeout=1)

# Main scene
scene=display(title="9DOF Razor IMU test")
scene.range=(1.2,1.2,1.2)
#scene.forward = (0,-1,-0.25)
scene.forward = (1,0,-0.25)
scene.up=(0,0,1)

# Second scene (Roll, Pitch, Yaw)
scene2 = display(title='9DOF Razor IMU test',x=0, y=0, width=500, height=200,center=(0,0,0),         background=(0,0,0))
scene2.range=(1,1,1)
scene.width=500
scene.y=200

scene2.select()
#Roll, Pitch, Yaw
cil_roll = cylinder(pos=(-0.4,0,0),axis=(0.2,0,0),radius=0.01,color=color.red)
cil_roll2 = cylinder(pos=(-0.4,0,0),axis=(-0.2,0,0),radius=0.01,color=color.red)
cil_pitch = cylinder(pos=(0.1,0,0),axis=(0.2,0,0),radius=0.01,color=color.green)
cil_pitch2 = cylinder(pos=(0.1,0,0),axis=(-0.2,0,0),radius=0.01,color=color.green)
#cil_course = cylinder(pos=(0.6,0,0),axis=(0.2,0,0),radius=0.01,color=color.blue)
#cil_course2 = cylinder(pos=(0.6,0,0),axis=(-0.2,0,0),radius=0.01,color=color.blue)
arrow_course = arrow(pos=(0.6,0,0),color=color.cyan,axis=(-0.2,0,0), shaftwidth=0.02, fixedwidth=1)

#Roll,Pitch,Yaw labels
label(pos=(-0.4,0.3,0),text="Roll",box=0,opacity=0)
label(pos=(0.1,0.3,0),text="Pitch",box=0,opacity=0)
label(pos=(0.55,0.3,0),text="Yaw",box=0,opacity=0)
label(pos=(0.6,0.22,0),text="N",box=0,opacity=0,color=color.yellow)
label(pos=(0.6,-0.22,0),text="S",box=0,opacity=0,color=color.yellow)
label(pos=(0.38,0,0),text="W",box=0,opacity=0,color=color.yellow)
label(pos=(0.82,0,0),text="E",box=0,opacity=0,color=color.yellow)
label(pos=(0.75,0.15,0),height=7,text="NE",box=0,color=color.yellow)
label(pos=(0.45,0.15,0),height=7,text="NW",box=0,color=color.yellow)
label(pos=(0.75,-0.15,0),height=7,text="SE",box=0,color=color.yellow)
label(pos=(0.45,-0.15,0),height=7,text="SW",box=0,color=color.yellow)

L1 = label(pos=(-0.4,0.22,0),text="-",box=0,opacity=0)
L2 = label(pos=(0.1,0.22,0),text="-",box=0,opacity=0)
L3 = label(pos=(0.7,0.3,0),text="-",box=0,opacity=0)

# Main scene objects
scene.select()
# Reference axis (x,y,z)
arrow(color=color.green,axis=(1,0,0), shaftwidth=0.02, fixedwidth=1)
arrow(color=color.green,axis=(0,-1,0), shaftwidth=0.02 , fixedwidth=1)
arrow(color=color.green,axis=(0,0,-1), shaftwidth=0.02, fixedwidth=1)
# labels
label(pos=(0,0,0.8),text="9DOF Razor IMU test",box=0,opacity=0)
label(pos=(1,0,0),text="X",box=0,opacity=0)
label(pos=(0,-1,0),text="Y",box=0,opacity=0)
label(pos=(0,0,-1),text="Z",box=0,opacity=0)
# IMU object
platform = box(length=1, height=0.05, width=1, color=color.red)
p_line = box(length=1,height=0.08,width=0.1,color=color.yellow)
plat_arrow = arrow(color=color.green,axis=(1,0,0), shaftwidth=0.06, fixedwidth=1)


f = open("Serial"+str(time())+".txt", 'w')

roll=0
pitch=0
yaw=0
while 1:
    line = ser.readline()
    line = line.replace("!ANG:","")   # Delete "!ANG:"
    print line
    f.write(line)                     # Write to the output log file
    words = string.split(line,",")    # Fields split
    if len(words) > 2:
       try:
            roll = float(words[0])*grad2rad
            pitch = float(words[1])*grad2rad
            yaw = float(words[2])*grad2rad
        except:
            print "Invalid line"

        axis=(cos(pitch)*cos(yaw),-cos(pitch)*sin(yaw),sin(pitch)) 
        up=(sin(roll)*sin(yaw)+cos(roll)*sin(pitch)*cos(yaw),sin(roll)*cos(yaw)-    cos(roll)*sin(pitch)*sin(yaw),-cos(roll)*cos(pitch))
        platform.axis=axis
        platform.up=up
        platform.length=1.0
        platform.width=0.65
        plat_arrow.axis=axis
        plat_arrow.up=up
        plat_arrow.length=0.8
        p_line.axis=axis
        p_line.up=up
        cil_roll.axis=(0.2*cos(roll),0.2*sin(roll),0)
        cil_roll2.axis=(-0.2*cos(roll),-0.2*sin(roll),0)
        cil_pitch.axis=(0.2*cos(pitch),0.2*sin(pitch),0)
        cil_pitch2.axis=(-0.2*cos(pitch),-0.2*sin(pitch),0)
        arrow_course.axis=(0.2*sin(yaw),0.2*cos(yaw),0)
        L1.text = str(float(words[0]))
        L2.text = str(float(words[1]))
        L3.text = str(float(words[2]))        
ser.close
f.close
4

2 回答 2

0

如果建议像这样的东西，您必须使用一些旧教程string.split(line,",")

从您的消息来源看来，问题出在此处：

L1.text = str(float(words[0]))
L2.text = str(float(words[1]))
L3.text = str(float(words[2]))

您正在尝试将某些内容转换为浮点数，而 Python 无法将其转换为数字。从外观上看，这些是文本标签，所以为什么不尝试：

L1.text = words[0]
L2.text = words[1]
L3.text = words[2]

还有一些提示：

words = line.split(',') # instead of: words = string.split(line,",")
ser.close() # close is a function, so you should call it.
f.close()
于 2013-05-16T14:15:05.367 回答
0

对代码进行以下更改：

  • 换行

    line = line.replace("!ANG:","")

    和

    line = line.replace("#YPR=","")
  • 如前所述替换分割线，这应该可以解决问题！
于 2016-01-15T06:39:21.697 回答