아틱과 버튼 사용 예제 (파이썬 사용)

[ ~ ]# nano button.py

#!/usr/bin/python

import time

import sys

print "Toggle a button"

buttonpin = 30

#export pin 30 by opening file and writing the pin number to it

pinctl = open("/sys/class/gpio/export", "wb", 0)

try:

    pinctl.write( str(buttonpin))

    print "Exported pin", str(buttonpin)

except:

    print "Pin ", str(buttonpin), " has been exported"

pinctl.close()

#set pin to be digital input

filename = '/sys/class/gpio/gpio%d/direction' % buttonpin

pinctldir = open(filename, "wb", 0)

try:

    pinctldir.write("in")

    print "Set pin ", str(buttonpin), " as digital input"

except:

    print "Failed to set pin direction"

pinctldir.close()

def exit_gpio():

    #unexport pin

    pinctl = open("/sys/class/gpio/unexport", "wb", 0)

    try:

        pinctl.write( str(buttonpin))

        print "Unexported pin", str(buttonpin)

    except:

        print "Pin ", str(buttonpin), " has been unexported"

    pinctl.close()

#pin value changes when the button is pressed

filename = '/sys/class/gpio/gpio%d/value' % buttonpin

while True:

    try:

        pin = open(filename, "rb", 0)

        print pin.read()

        time.sleep(1)

        pin.close()

    except KeyboardInterrupt:

        exit_gpio()

        sys.exit(0)

[ ~ ]# python button.py