用python控制树莓派的GPIO

树莓派这个命令的最后一个字（Pi），就是来自python，树莓派官方发布的OS版本，都集成了python，可见树莓派和python的联系很紧密。用python来控制GPIO，也是自然而然的事情了。

首先需要安装一个package，RPi.GPIO。

然后就可以控制GPIO了：

>>> import RPi.GPIO as GPIO
>>> GPIO.setmode(GPIO.BCM)  # use BCM number system
>>> GPIO.setup(18, GPIO.OUT)
>>> GPIO.output(18, GPIO.HIGH)  # high voltage
>>> GPIO.output(18, GPIO.LOW)  # low voltage
>>> GPIO.cleanup()

很简单。

This package provides a class to control the GPIO on a Raspberry Pi.
Note that this module is unsuitable for real-time or timing critical applications. This is because you can not predict when Python will be busy garbage collecting. It also runs under the Linux kernel which is not suitable for real time applications - it is multitasking O/S and another process may be given priority over the CPU, causing jitter in your program. If you are after true real-time performance and predictability, buy yourself an Arduino.

因为Python和Linux多task的原因，不适合用来做realtime应用。但为啥要建议购买Arduino呢？

-- EOF --

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