我尝试使用运行最新 Rasbian的 Raspberry Pi B + 上的 OWN（开放天气网络）设置滚动天气Feed Wheezy 发行版，我在使用 Python LIRC（Linux红外遥控器）添加IR支持时遇到问题。
我想做的事情： 有四个天气变量：条件，温度，湿度和风速。它们将出现在我的16x2液晶显示屏上，标题位于顶行，第二个值为中心值。他们将在屏幕上停留五秒钟，然后再换下一个。一旦它到达终点，它将再次循环。循环180次（大约一小时）后，它将更新天气。我想用我的红外遥控器的按钮1-4跳转到一个特定的磁贴，然后继续回到它的循环。
它正在做什么： 如果没有按下任何按钮，而不是像 LIRC 阻止关闭那样跳过空队列，它会挂起 lirc.nextcode（）等待按下按钮，直到我退出 KeyboardInterrupt 。
一切都很好，直到我添加IR。现在它显示第一个天气变量，然后当它尝试拉下一个天气变量时，如果队列中没有IR代码，则跳过并转到下一个平铺， lirc.nextcode（）暂停代码，直到它收到一个IR代码，在 LIRC 阻止关闭时不应该发生。
我有最新版本的所有内容（ Python LIRC 1.2.1 ），我知道以前版本的 Python LIRC 有阻塞参数的错误。我花了两天时间研究并尝试了所有可能的事情。以下是我找到的一种可能的解决方法，但它受到同一问题的影响：＆＃34; Python LIRC blocking Signal workaround not working＆＃34;
我知道很多代码是不合适的，即全局变量，东西需要在函数中，OWN每三小时更新一次，我每小时更新一次，但这是暂时的让它工作。我将整理它并使其稍后面向对象。如果这让一些人更难阅读，请提前抱歉。
import pyowm
from sys import exit
import time
import RPi.GPIO as GPIO
from RPLCD import CharLCD, cleared, cursor
import lirc
# initialize lirc and turn of blocking
sockid = lirc.init("weather", blocking=False)
lirc.set_blocking(False, sockid)
# initialize weather network
owm = pyowm.OWM('API #')
# initialize LCD
lcd = CharLCD(pin_rs=26, pin_rw=None, pin_e=24, pins_data=[22, 18, 16, 12],
cols=16, rows=2)
# weather data
w = None # wind m/s
wind = None # wind km/h
windkm = None
humidity = None
temper = None
COUNTER = 0 #number of cycles before update
NEXT = 1
# switches to next tile
def next_tile():
global NEXT
这就是问题所在。 Lirc.nextcode（）应拉下一个IR 来自 LIRC 队列的代码，并将其作为列表添加到 codeIR ，但如果没有 按钮已按下，阻止已关闭，它应该跳过 代码。相反，它就像阻止打开一样，并一直挂起 按下按钮。然后它仍然不会继续我的主循环。它 只需打印 NEXT 并挂起，直到我 KeyboardInterrupt 结束。
codeIR = lirc.nextcode() # pulls IR code from LIRC queue.
# checks if there's a code in codeIR and goes to that tile. If not, it
# goes to the next tile instead.
if not codeIR:
if NEXT != 4: # if it's the last tile, cycle to the first
NEXT += 1
print NEXT
return NEXT
else: # if not last tile, go to next
NEXT -= 3
print NEXT
return NEXT
else:
NEXT = codeIR[0]
print NEXT
return NEXT
我已经添加了其余的代码，一切正常，但我确定它会帮助您理解我想要完成的任务。
while True:
try:
if COUNTER == 0:
COUNTER = 180
# Search for current weather in London (UK)
observation = owm.weather_at_place('City, State')
w = observation.get_weather()
# Weather details
wind = w.get_wind() # {'speed': 4.6, 'deg': 330}
windkm = (wind['speed'] * 3600) / 1000 #convet to km/h
humidity = w.get_humidity()
# {'temp_max': 10.5, 'temp': 9.7, 'temp_min': 9.0}
temper = w.get_temperature('celsius')
else:
while NEXT == 1:
# prints condition to lcd
lcd.cursor_pos = (0, 4) #adjust cursor position
lcd.write_string('Weather') # write to lcd
lcd.cursor_pos = (1, 5) # adjust cursor position
lcd.write_string(w.get_status()) # write to lcd
time.sleep(5) # leave on lcd for 5 seconds
lcd.clear() # clear lcd
next_tile() # switches to next tile
while NEXT == 2:
# prints temp to lcd
lcd.cursor_pos = (0, 2)
lcd.write_string('Temperature')
lcd.cursor_pos = (1, 6)
lcd.write_string(str(temper['temp']))
lcd.write_string(' C')
time.sleep(5)
lcd.clear()
next_tile()
while NEXT == 3:
# prints temp to lcd
lcd.cursor_pos = (0, 4)
lcd.write_string('Humidity')
lcd.cursor_pos = (1, 6)
lcd.write_string(str(humidity))
lcd.write_string(' %')
time.sleep(5)
lcd.clear()
next_tile()
while NEXT == 4:
# prints wind speed to lcd
lcd.cursor_pos = (0, 3)
lcd.write_string('Wind Speed')
lcd.cursor_pos = (1, 6)
lcd.write_string(str(int(windkm)))
lcd.write_string('km')
time.sleep(5)
lcd.clear()
COUNTER -= 1
codeIR = lirc.nextcode()
next_tile()
# quit with ctrl+C
except(KeyboardInterrupt, SystemExit):
print 'quitting'
lcd.close(clear=True)
lirc.deinit()
exit()
当我键盘输入输出时，跟踪总是会导致 lirc.nextcode（），我发布错误，但我稍微更改了代码，现在它只追溯到包含 lirc.nextcode（）的函数。
我花了两天的时间试图解决这个问题而且我几乎拔掉了头发，所以我会采取任何解决方案或解决方法，你们可以给我。在此先感谢，我真的很感激我能找到的任何帮助。我找到了使用信号模块AlarmException 的解决方法，但是当我从raw_input（）切换到lirc.nextcode（）时，它也会以相同的方式挂起（即使它在raw_input（）上放置一个计时器也没问题并阻止警报工作正常。再次点击链接：＆＃34; Python LIRC blocking Signal workaround not working＆＃34;
答案 0 :(得分：2)
我猜想错误仍然在 1.2.1 。我切换到 Pylirc2 并关闭阻止 pylirc.blocking（0）没问题。我还必须从 next_tile（）函数中删除return。
如果有人对此感兴趣，我最终会使用完成的代码，这肯定会为我节省很多时间：
import pyowm
from sys import exit
import time
import RPi.GPIO as GPIO, feedparser, time
from RPLCD import CharLCD, cleared, cursor
import pylirc
sockid = pylirc.init('weather')
allow = pylirc.blocking(0)
owm = pyowm.OWM('API Key')
lcd = CharLCD(pin_rs=26, pin_rw=None, pin_e=24, pins_data=[22, 18, 16, 12],
cols=16, rows=2)
class mail(object):
def __init__(self):
self.username = "email address"
self.password = "password"
self.newmail_offset = 0
self.current = 0
GPIO.setmode(GPIO.BOARD)
GPIO.setup(15, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)
GPIO.setup(11, GPIO.OUT)
def buzz(self):
self.period = 1.0 / 250
self.delay = self.period / 2
self.cycles = 250
for i in range(self.cycles):
GPIO.output(11, True)
time.sleep(self.delay)
GPIO.output(11, False)
time.sleep(self.delay)
def check(self):
self.newmails = int(feedparser.parse("https://" + self.username + ":" +
self.password +"@mail.google.com/gmail/feed/atom")
["feed"]["fullcount"])
if self.newmails > self.newmail_offset:
GPIO.output(15, True)
GPIO.output(13, False)
if self.newmails > self.current:
self.buzz()
self.current += 1
else:
GPIO.output(15, False)
GPIO.output(13, True)
self.current = 0
### will be a class
class weather(object):
def __init__(self):
self.w = None
self.wind = None
self.windkm = None
self.humidity = None
self.temper = None
self.counter = 0
self.next = 1
def update(self):
if self.counter == 0:
self.counter = 180
self.observation = owm.weather_at_place('City, Country')
self.w = self.observation.get_weather()
self.wind = self.w.get_wind()
self.windkm = (self.wind['speed'] * 3600) / 1000
self.humidity = self.w.get_humidity()
self.temper = self.w.get_temperature('celsius')
else:
pass
def display_weather(self):
lcd.cursor_pos = (0, 4)
lcd.write_string('Weather')
lcd.cursor_pos = (1, 5)
lcd.write_string(self.w.get_status())
time.sleep(3)
lcd.clear()
def display_temp(self):
lcd.cursor_pos = (0, 2)
lcd.write_string('Temperature')
lcd.cursor_pos = (1, 6)
lcd.write_string(str(self.temper['temp']))
lcd.write_string(' C')
time.sleep(3)
lcd.clear()
def display_hum(self):
lcd.cursor_pos = (0, 4)
lcd.write_string('Humidity')
lcd.cursor_pos = (1, 6)
lcd.write_string(str(self.humidity))
lcd.write_string(' %')
time.sleep(3)
lcd.clear()
def display_wind(self):
lcd.cursor_pos = (0, 3)
lcd.write_string('Wind Speed')
lcd.cursor_pos = (1, 4)
lcd.write_string(str(int(self.windkm)))
lcd.write_string('km/h')
time.sleep(3)
lcd.clear()
def next_tile(self):
self.counter -= 1
self.codeIR = pylirc.nextcode()
if not self.codeIR or self.codeIR[0] == self.next:
if self.next != 4:
self.next += 1
else:
self.next -= 3
else:
self.next = int(self.codeIR[0])
email = mail()
weather = weather()
weather.update()
def up_next():
weather.update()
weather.next_tile()
while True:
try:
while weather.next == 1:
weather.display_weather()
up_next()
while weather.next == 2:
weather.display_temp()
up_next()
while weather.next == 3:
weather.display_hum()
up_next()
while weather.next == 4:
weather.display_wind()
email.check()
up_next()
except(KeyboardInterrupt, SystemExit):
print 'quitting'
lcd.close(clear=True)
exit()