Raspberry Pi + Arduino + Python - 值錯誤：需要超過1個值才能打包

Question

我正在努力獲得一個集成工作，在一個被黑客竊取的MindFlex EEG閱讀器到Arduino Uno到Raspberry Pi工作。我已按照來自源代碼的信的說明操作，即here。下面是代碼：

from pygame import * 
import random 
import time 
import serial 

# set up the serial port 
ser = serial.Serial('/dev/ttyACM0',9600) 

# Clear the serial input buffer 

ser.flushInput() 

# variables for colours 
black = [ 0, 0, 0] 
white = [255,255,255] 
red = [255, 0, 0] 
blue = [0,0,255] 
darkBlue = [0,0,128] 
pink = [255,200,255] 
green = [0,255,0] 
orange = [255,102,0] 
brown = [153,102,0] 
yellow = [255,255,0] 
purple = [128,0,128] 

# gap in wall 
gap = 200 

# width and height of screen 
width = 1000 
height = 600 
count_gap = int(height/gap) 

# 0 = hard, 1 = easier, 2 is easiest 
difficulty = 2 

# class to create sprites and render them 
class Sprite: 
def __init__(self,xpos,ypos,filename): 
    self.x = xpos 
    self.y = ypos 
    self.bitmap = image.load(filename) 
def render(self): 
    screen.blit(self.bitmap,(self.x,self.y)) 

# screen size 
size=[width,height] 
# initialise pygame 
init() 

# create the screen (window) 
screen = display.set_mode(size) 

# Caption to go at the top of the window 
display.set_caption("Flappy EEG 2") 

# set the music, its volume and start to play. -1 means infinite loop 
mixer.music.load("Pinky_and_the_Brain.ogg") 
mixer.music.set_volume(0.5) 
mixer.music.play(-1) 

# create sound for crash 
crasheffect = mixer.Sound("ouch.ogg") 


# fill the screen with blue, update the screen 
# not really required but I like it 
screen.fill(blue) 
display.update() 
#time.sleep(1) 

# create the sprites for the brain, columns and the background image 

playerbrain = Sprite(20,200,"brain_75.png") 
column1 = Sprite(1200,100,"column1.png") 
column2 = Sprite(1200,100,"column2.png") 
background = Sprite(0,0,"background.png") 

# set fonts for different purposes 
scorefont = font.Font(None,60) 
datafont = font.Font(None,20) 
overfont = font.Font(None,100) 

# set default values for some variables 
score = 0 
maxscore = 0 
quit = 0 
gameover = 0 

# master loop for the program. If quit == 0 then exit program 
while quit == 0: 
# flush the serial port of all data to begin fresh 
ser.flushInput() 

gameover = 0 

# set the height of top column 
column1.y = (random.randrange(0,(count_gap))*gap)-800 

# set the height of the bottom column 
column2.y = column1.y + 800 + gap 

# start of loop (using while) to move the columns 

# start off screen to the right 
x = width +50 

# x>-100 means still valid (yes there is a minus in there) 
# gameover when collision 
# quit selected. either pressed q or click x on window 
while x >-100 and gameover == 0 and quit == 0: 

# increment the score and if higher than maxscore make maxscore = score 
    score = score + 1 
    if score > maxscore: 
     maxscore = score 

# update columns location and set x positions 
    x = x - 50 
    column1.x = x 
    column2.x =x 

    data = ser.readline() 
# print data 

    signal,att,med,delta,theta,lalpha,halpha,lbeta,hbeta,lgamma,hgamma 
= data.split(",") 
    print "signal: " + signal 
    print "attention: " + att 
    print "data: " + data 
    intatt = int(att) 
    if intatt > 90: 
     intatt = 90 
    brainpos = intatt * 6 
# set brain location based att (attention) 

# is intatt near the gap above 
    if brainpos < column1.y +800 and brainpos > column1.y + 800 - 
(difficulty * 10): 
     playerbrain.y = column1.y +800 +70 
     print "brain near top and moved down!" 
# is intatt near gap bottom 
    elif brainpos > column2.y-75 and brainpos < column2.y + 
(difficulty * 10): 
     playerbrain.y = column1.y +800 +70 
     print "brain near bottom and moved up!" 

    else: 
     playerbrain.y = brainpos 
     print "brain where is should be" 


# print playerbrain.y 
    background.render() 
    playerbrain.render() 
    column1.render() 
    column2.render() 

# display some information on screen 
    screen.blit(scorefont.render("Score: "+ str(score),1,white), (100, 5)) 
    screen.blit(scorefont.render("High Score: "+ 
str(maxscore),1,white), (400, 5)) 

    screen.blit(datafont.render("signal: "+ signal,1,white), (5, 570)) 
    screen.blit(datafont.render("attention: "+ att,1,white), (150, 570)) 

    screen.blit(datafont.render("playerbrain.y: "+ 
str(brainpos),1,white), (250, 570)) 
    screen.blit(datafont.render("column1.y: "+ 
str(column1.y+800),1,white), (500, 570)) 
    screen.blit(datafont.render("difficulty: "+ 
str(difficulty),1,white), (650, 570)) 

    display.update() 

# print playerbrain.y 

# collision dection 
    if ((playerbrain.y < column1.y+801 or playerbrain.y > 
column2.y-74) and (x <150 and x > 20)): 
     mixer.music.stop() 
     mixer.Sound.play(crasheffect) 
     print "BUMP" 
     gameover = 1 

# check if clicked x on window to exit 
    for ourevent in event.get(): 
     if ourevent.type == QUIT: 
      quit = 1 

# has key been pressed. K_q is to quit 
     if ourevent.type == KEYDOWN: 
      if ourevent.key == K_DOWN: 
       playerbrain.y = playerbrain.y+10 

      if ourevent.key == K_UP: 
       playerbrain.y = playerbrain.y-10 

      if ourevent.key == K_q: 
       quit = 1 

# if game over show message 
while gameover == 1 and quit == 0: 
    screen.blit(overfont.render("GAME OVER",1,yellow), (380, 260)) 
    display.update() 

# then wait for a key to pressed before starting again 
    for ourevent in event.get(): 
     if ourevent.type == KEYDOWN: 
      if ourevent.key == K_0: 
       difficulty = 0 
       score = 0 
       gameover = 0 
       mixer.music.play(-1) 

      if ourevent.key == K_1: 
       difficulty = 1 
       score = 0 
       gameover = 0 
       mixer.music.play(-1) 

      if ourevent.key == K_2: 
       difficulty = 2 
       score = 0 
       gameover = 0 
       mixer.music.play(-1) 

      if ourevent.key == K_SPACE: 
       score = 0 
       gameover = 0 
       mixer.music.play(-1) 

      if ourevent.key == K_q: 
       quit = 1 
       score = 0 
       gameover = 0 

我由sudo python flappybrain.py命令執行的Raspery Pi這個腳本。當然，我確保一切都正確地連接起來。當我運行ArduinoIDE我可以看到來自EEG的良好輸出。

然而，當我執行該腳本，它返回：

Traceback (most recent call last): 
    File "flappybrain.py", line 125, in <module> 
    signal,att,med,delta,theta,lalpha,halpha,lbeta,hbeta,lgamma,hgamma 
= data.split(",") 
ValueError: need more than 1 value to unpack 

當MindFlex沒有迷上了（它只是掛起，然後）我沒有得到這個錯誤。查看了MindFlex的原始輸出後，它顯示爲數字行;值從EEG。顯然，腳本遇到了麻煩。一個典型的行可能看起來像：

20010,2140,43234,345,2342,2342,4534,5643,564,3244,7865 

我可以看到腳本試圖做什麼，而不是爲什麼它不能這樣做。非常感謝您的幫助。

Answer 1

在這種情況下，您遇到了不包含這些分隔符（逗號）的輸入行。你可以通過continue來處理ValueError（僅在這一行！）或者放置一個可以檢查逗號的警衛，並且可以使用continue。或者你可以過濾掉不含逗號的行，如果這是有道理的。

否則，如果它無效，您必須拒絕此輸入。

例如：

data = ser.readline() 
# print data 
    EXPECTED_FIELD_COUNT = 11 
    if len(data.split(',')) != EXPECTED_FIELD_COUNT: 
     continue 
    signal,att,med,delta,theta,lalpha,halpha,lbeta,hbeta,lgamma,hgamma = data.split(",") 

Answer 2

確保如果type(data)爲<type 'str'>，如果不是你應該：

str(data).split(",") 

，如果你需要和INT類型：

int(result[i])