GPIO设置错误和键盘中断Python

Question

我写了一个代码来打开一个继电器2秒，然后关闭，但我有问题。在

首先，程序运行时出现以下错误，但GPIO已设置：

`Traceback (most recent call last):
  File "relay_control.py", line 16, in <module>
    GPIO.output(2, GPIO.HIGH)
RuntimeError: Please set pin numbering mode using GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM)`

我的第二个问题是我想设置keyboardInterrupt，但是当我使用except KeyboardInterrupt:时，我得到了一个错误，没有运行任何东西，如果我忽略了这个，它会经过一个循环并退出（如预期）：

^{pr2}$

我不确定出了什么问题，完整代码如下：

import RPi.GPIO as GPIO
from time import sleep

    GPIO.setmode(GPIO.BCM)

    # Set relay pins as output
    GPIO.setup(2, GPIO.OUT)
    GPIO.setup(3, GPIO.OUT)
    GPIO.setup(4, GPIO.OUT)
    GPIO.setup(17, GPIO.OUT)

    while (True):

        # Turn all relays ON
        GPIO.output(2, GPIO.HIGH)
        GPIO.output(3, GPIO.HIGH)
        GPIO.output(4, GPIO.HIGH)
        GPIO.output(17, GPIO.HIGH)
        # Sleep for 5 seconds
        sleep(2)
        # Turn all relays OFF
        GPIO.output(2, GPIO.LOW)
        GPIO.output(3, GPIO.LOW)
        GPIO.output(4, GPIO.LOW)
        GPIO.output(17, GPIO.LOW)
        # Sleep for 5 seconds
        sleep(2)

    except KeyboardInterrupt:
        print "Quit"
        GPIO.cleanup()

Answer 1

以某种方式修复键盘中断不会产生任何错误：

import RPi.GPIO as GPIO
from time import sleep

# The script as below using BCM GPIO 00..nn numbers
GPIO.setmode(GPIO.BCM)

# Set relay pins as output
GPIO.setup(2, GPIO.OUT)
GPIO.setup(3, GPIO.OUT)
GPIO.setup(4, GPIO.OUT)
GPIO.setup(17, GPIO.OUT)

try:
        while (True):

            # Turn all relays ON
            GPIO.output(2, GPIO.HIGH)
            GPIO.output(3, GPIO.HIGH)
            GPIO.output(4, GPIO.HIGH)
            GPIO.output(17, GPIO.HIGH)
            # Sleep for 5 seconds
            sleep(2)
            # Turn all relays OFF
            GPIO.output(2, GPIO.LOW)
            GPIO.output(3, GPIO.LOW)
            GPIO.output(4, GPIO.LOW)
            GPIO.output(17, GPIO.LOW)
            # Sleep for 5 seconds
            sleep(2)

except KeyboardInterrupt:
    print "Quit"
    GPIO.cleanup()