#!/usr/bin/env python

# encoding: utf-8

import RPi.GPIO as GPIO

import time

# 指定GPIO口的选定模式为GPIO引脚编号模式

GPIO.setmode(GPIO.BCM)

# 指定GPIO14的模式为输出模式,且初始状态为低电平。

# 如果上面GPIO口的选定模式指定为主板模式的话，这里就应该指定8号而不是14号。

GPIO.setup(14, GPIO.OUT,initial = GPIO.LOW)

# 循环10次

for i in range(0, 10):

    # 让GPIO14输出高电平（LED灯亮）

    GPIO.output(14, True)

    # 持续一段时间

    time.sleep(0.5)

    # 让GPIO14输出低电平（LED灯灭）

    GPIO.output(14, False)

    # 持续一段时间

    time.sleep(0.5)

GPIO.cleanup()

# 清理GPIO口

#!/usr/bin/env python

# encoding: utf-8

import time

import RPi.GPIO as GPIO

GPIO.cleanup()

GPIO.setmode(GPIO.BCM)

btn_input = 27;

LED_output = 17;

# GPIO btn_input set up as input.

GPIO.setup(btn_input, GPIO.IN)

GPIO.setup(LED_output, GPIO.OUT)

# handle the button event

def buttonEventHandler_rising (pin):

    # turn LED on

    print('buttonEventHandler_rising',pin)

    GPIO.output(LED_output,True)

GPIO.add_event_detect(btn_input, GPIO.RISING , callback=buttonEventHandler_rising, bouncetime=200) 

try:

    while True : time.sleep(0.1)

finally:

    GPIO.remove_event_detect(btn_input)

    GPIO.cleanup()

#!/usr/bin/python

#+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

#|R|a|s|p|b|e|r|r|y|P|i|-|S|p|y|.|c|o|.|u|k|

#+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

#

# ultrasonic_1.py

# Measure distance using an ultrasonic module

#

# Author : Matt Hawkins

# Date   : 09/01/2013

# Import required Python libraries

import time

import RPi.GPIO as GPIO

# Use BCM GPIO references

# instead of physical pin numbers

GPIO.setmode(GPIO.BCM)

# Define GPIO to use on Pi

GPIO_TRIGGER = 23

GPIO_ECHO    = 24

print "Ultrasonic Measurement"

# Set pins as output and input

GPIO.setup(GPIO_TRIGGER,GPIO.OUT)  # Trigger

GPIO.setup(GPIO_ECHO,GPIO.IN)      # Echo

while 1==1:

  # Set trigger to False (Low)

  GPIO.output(GPIO_TRIGGER, False)

  # Allow module to settle

  time.sleep(0.5)

  # Send 10us pulse to trigger

  GPIO.output(GPIO_TRIGGER, True)

  time.sleep(0.00001)

  GPIO.output(GPIO_TRIGGER, False)

  start = time.time()

  while GPIO.input(GPIO_ECHO)==0:

    start = time.time()

  while GPIO.input(GPIO_ECHO)==1:

    stop = time.time()

  # Calculate pulse length

  elapsed = stop-start

  # Distance pulse travelled in that time is time

  # multiplied by the speed of sound (cm/s)

  distance = elapsed * 34300

  # That was the distance there and back so halve the value

  distance = distance / 2

  print "Distance : %.1f" % distance

  # Reset GPIO settings

GPIO.cleanup()