blocks|key|332608|text|您可以将GPIO代码包装到它自己的线程中，让程序的其余部分在GPIO等待输入时执行其他操作。查看threading+module|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|332609|首先，我会将您的代码封装到一个函数中|332610|def+wait_input():
++++var=1
++++counter+=+0
++++while+var+==+1:
++++++++if+GPIO.input(7):
++++++++++++counter+%2B=+1
++++++++time.sleep(0.5)
++++++++else:
++++++++++++counter+=+0
++++++++++++time.sleep(1)
++++++++if+counter+>=+3:
++++++++++++print+"Movement!"
++++++++++++captureImage()
++++++++++++time.sleep(20)|code-block|syntax|javascript|332611|然后在你的主程序中，你可以像这样|332612|input_thread+=+threading.Thread(target+=+wait_input)
input_thread.start()
#+do+something+in+the+meanwhile
input_thread.join()|332613|关于python线程有很多问题，所以你可能想把它们找出来。请注意，在使用线程时也有很多事情需要考虑，特别是在python中，它有一个全局解释器锁(GIL)，一次只允许一个进程运行。查看可以绕过GIL路由的multiprocessing+module也可能是聪明的做法。|332614|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/2/library/threading.html|1|http://docs.python.org/2/library/multiprocessing.html^0|1C|G|0|0|0|0|0|0|2U|M|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

You could wrap the GPIO-code into it's own thread and have the rest of your program do something else while the GPIO is waiting for input. Check out the <a href="http://docs.python.org/2/library/threading.html" rel="nofollow">threading module</a>

First I'd wrap your code into a function

<pre><code>def wait_input():
 var=1
 counter = 0
 while var == 1:
 if GPIO.input(7):
 counter += 1
 time.sleep(0.5)
 else:
 counter = 0
 time.sleep(1)
 if counter &gt;= 3:
 print "Movement!"
 captureImage()
 time.sleep(20)
</code></pre>

And then in your main program you could something like this

<pre><code>input_thread = threading.Thread(target = wait_input)
input_thread.start()
# do something in the meanwhile
input_thread.join()
</code></pre>

There are plenty of questions on SO concerning python threading, so you might want to dig them up. Please note that there are also plenty of things to consider when using threads, especially in python which has a global interpreter lock (GIL) which allows only one process to run at a time. It might also be smart to check out the <a href="http://docs.python.org/2/library/multiprocessing.html" rel="nofollow">multiprocessing module</a> with which one can route around the GIL.

blocks|key|115144|text|现在RPi+GPIO库内置了中断驱动的GPIO控制，这可以在单独的线程中发生，从而释放资源。您可能希望阅读以下http://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|115145|entityMap|0|LINK|mutability|MUTABLE|url|http://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3^0|1J|2M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Now the RPi GPIO library has inbuilt interrupt driven GPIO control which can happen in separate thread freeing up resources.
You may wish to read the following <a href="http://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3" rel="nofollow">http://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3</a>

blocks|key|332696|text|kapcom01给出了一些很好的想法，但最好不要在中断中做太多的指令。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|332697|通常，当回调为call时，您会将一个标志设为1，并在main函数中进行处理。在这种方式下，不存在释放程序员的风险。|332698|像这样的东西：|332699|+++++from+time+import+sleep
+++++import+RPi.GPIO+as+GPIO



+++++def+init():
+++++++++#+make+all+your+initialization+here
+++++++++flag_callback+=+False
+++++++++#+add+an+interrupt+on+pin+number+7+on+rising+edge
+++++++++GPIO.add_event_detect(7,+GPIO.RISING,+callback=my_callback,+bouncetime=300)


+++++def+my_callback():
+++++++++#+callback+=+function+which+call+when+a+signal+rising+edge+on+pin+7
+++++++++flag_callback+=+True


+++++def+process_callback():
+++++++++#+TODO: make+process+here
+++++++++print('something')


+++++if+__name__+==+'__main__':
+++++#+your+main+function+here

+++++#+1-+first+call+init+function
+++++init()

+++++#+2-+looping+infinitely+
+++++while+True:
+++++++++#3-+test+if+a+callback+happen
+++++++++if+flag_callback+is+True:
+++++++++++++#4-+call+a+particular+function
+++++++++++++process_callback()
+++++++++++++#5-+reset+flagfor+next+interrupt
+++++++++++++flag_callback+=+False
++++pass|code-block|syntax|javascript|332700|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

kapcom01 gives some great ideas but it's better to make not make a lot of instructions in the a interrupt.

Usually you put a flag to 1 when the callback is call and you make the processing in the main function. In thes manner there is no risk of freesing the programm.

Somethings like this :

<pre><code> from time import sleep
 import RPi.GPIO as GPIO



 def init():
 # make all your initialization here
 flag_callback = False
 # add an interrupt on pin number 7 on rising edge
 GPIO.add_event_detect(7, GPIO.RISING, callback=my_callback, bouncetime=300)


 def my_callback():
 # callback = function which call when a signal rising edge on pin 7
 flag_callback = True


 def process_callback():
 # TODO: make process here
 print('something')


 if __name__ == '__main__':
 # your main function here

 # 1- first call init function
 init()

 # 2- looping infinitely 
 while True:
 #3- test if a callback happen
 if flag_callback is True:
 #4- call a particular function
 process_callback()
 #5- reset flagfor next interrupt
 flag_callback = False
 pass
</code></pre>

I am using the GPIO pins on my Raspberry Pi with a PIR sensor to detect motion. When the sensor detects motion I want to then move the software onto other functions.

At the moment, to detect motion I have my program constantly running in a loop while it is waiting for motion to be detected. While this works at the moment, for use in the future this will be incredibly inefficient and am hoping to improve on this by assigning it to an event.

Is there any way to bind my GPIO input to an event that is detected by the program without manually running a loop.

Here is my current loop for detection motion:

<pre><code>var = 1
counter = 0
while var == 1:
 if GPIO.input(7):
 counter += 1
 time.sleep(0.5)
 else:
 counter = 0
 time.sleep(1)

 if counter &gt;= 3:
 print "Movement!"
 captureImage()
 time.sleep(20)
</code></pre>

The counter and detecting motion multiple times is used to reduce the number of false positives that the sensor picks up.

Raspberry Pi- GPIO Events in Python

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我正在使用我的树莓Pi上的GPIO引脚与PIR传感器来检测运动。当传感器检测到运动时，我想将软件移到其他功能上。目前，为了检测运动，我让我的程序在等待运动被检测的同时不断地循环运行。虽然这在目前是有效的，但对于未来的使用，这将是令人难以置信的低效，我希望通过将其分配给一个事件来改进这一点。有没有办法将我的GPIO输入绑...

问Raspberry Pi- Python中的GPIO事件
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