我正在尝试使用运行最新 Rasbian Wheezy 发行版的 Raspberry Pi B + 在我的 Raspberry Pi B + 上使用 OWN(开放天气网络)设置滚动天气供稿，但在使用 Python LIRC添加IR支持时遇到了问题( Linux红外线 Remote )。
我正在尝试做的事情:
天气变量有四个:条件，温度，湿度和风速。它们将出现在我的16x2 LCD屏幕上，标题居中，第一行居中。它们将在屏幕上停留五秒钟，然后被下一个替换。一旦到达终点，它将再次循环。循环180次(约一小时)后，它将更新天气。我想使用我的红外线 Remote 的按钮1-4跳到特定的图块，然后继续循环播放。
在做什么:
当没有按钮被按下时，与其挂起 LIRC 来跳过空队列，它卡在 lirc.nextcode()上，等待按钮按下，直到我退出 KeyboardInterrupt 为止。
一切正常，直到我添加IR。现在，它显示第一个天气变量，然后在尝试拉出下一个天气变量时，而不是在队列中没有IR代码的情况下跳过并跳至下一个图块， lirc.nextcode()暂停代码，直到接收到IR代码，而 LIRC 阻止功能已关闭则不应发生。
我拥有所有软件的最新版本( Python LIRC 1.2.1 )，我知道的先前版本Python LIRC 的阻塞参数存在错误。我花了两天时间研究并尝试所有可能的事情。这是我发现的一种可能的解决方法，但是它受到与此相同的问题的影响:“Python LIRC blocking Signal workaround not working”
我知道很多代码是不正确的，例如，全局变量，东西需要包含在函数中，OWN每三个小时更新一次，而我每小时更新一次，但这是暂时的，以使其正常工作。我将整理它，稍后使其面向对象。抱歉，如果这样会使某些人更难以阅读。
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()应该拉下一个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
按下按钮，并且阻止功能已关闭，应该跳过
代码。相反，它的作用就像阻止已打开，并挂起直到
按下一个按钮。然后它仍然不会继续我的主循环。它
只是打印下一个并挂起，直到我 KeyboardInterrupt 退出为止。
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，它们都可以正常工作，但是我敢肯定，它将帮助您了解我要完成的工作。
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 KeyboardInterrupt 外出时， Traceback 总是导致 lirc.nextcode()，我将发布该错误，但是我更改了代码，现在它仅追溯到包含 lirc.nextcode的函数()。
我花了两天时间来解决这个问题，而且我几乎要拔头发了，所以我会采取任何解决方案或变通办法，你们可以给我。在此先感谢您，我非常感谢能找到的任何帮助。我找到了使用信号模块AlarmException 的解决方法，但是从我从raw_input()切换到lirc.nextcode()的那一刻，它也以相同的方式挂起(即使将计时器放在raw_input()上也没有问题)并阻止了警报从正确的工作。再次是链接:“Python LIRC blocking Signal workaround not working”
最佳答案
事实证明，该错误仍在 1.2.1 中。我切换到 Pylirc2 ，它关闭了 pylirc.blocking(0)的无问题阻止功能。我还必须从 next_tile()函数中删除return。
如果有人感兴趣，这是我最终使用的完成代码，它肯定会节省很多时间:
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()