Raspberry PI上操作GPIO(GPIO编程)
一 Raspberry PI的GPIO
1. 什么是GPIO
2. Raspberry上的GPIO介绍
二Raspberry PI上编程操作GPIO
1. Python操作
(1) 安装环境
a.下载控制GPIO的python库:http://pypi.python.org/pypi/RPi.GPIO/0.3.1a#downloads
b. 在Pi上安装python-dev: sudo apt-get install python-dev
c. 解压并安装python库
tar xvzf RPi.GPIO-0.x.xx.tar.gz
cd RPi.GPIO-0.x.xx
sudo python setup.py install
(2)测试程序
说明:led灯闪烁(分别接pi-01 和pi-11,11作为输出)
import RPi.GPIO as GPIO import time def blink(times, delay): GPIO.setmode(GPIO.BOARD) GPIO.setup(11, GPIO.OUT) while times>0: if 0==times%2: GPIO.output(11, GPIO.HIGH) #or output(11, GPIO.True) else: GPIO.output(11, GPIO.LOW) time.sleep(delay) times-=1 return if __name__ == '__main__': blink(20, 1)
(3)测试程序2——远程点亮/关闭相应的led灯
说明:和上个例子不同的就是a)用到了远程控制,即socket通信;b)操作多个led;
究其本质是一样。当然本人之所以要远程控制,只不过是为了以后远程管理更多的外设做个铺垫。
文件1:remoIO.py
import socket import time g_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) def init(ip, port): g_sock.connect((ip, port)) time.sleep(2) return def send(data): g_sock.send(data) return def read(): data = g_sock.recv(1024) return data def end(): g_sock.close() return def _test(ip, port): sock = init(ip, port) send("I am Raspberry Pi\r\n!"); print read(1024); sock.close() return if __name__=='__main__': #_test('192.168.2.1', 9999) import sys if len(sys.argv) == 3: _test(sys.argv[1], int(sys.argv[2])) else: print 'usage:'+sys.argv[0]+' ip port\r\n'
文件2:blink.py
import RPi.GPIO as GPIO import time import remoIO ip = '192.168.2.12' port = 8888 def blink(times, delay): R=11 Y=12 W=15 GPIO.setmode(GPIO.BOARD) GPIO.setup(R, GPIO.OUT) GPIO.setup(Y, GPIO.OUT) GPIO.setup(W, GPIO.OUT) remoIO.init(ip, port) remoIO.send('Now, you can input 1,2 or 3 to turnon the right led:') #in order to initial a communication protocol, add code here #.... command = '' while 1: command = remoIO.read() if command=='1\n': GPIO.output(R, GPIO.LOW) time.sleep(2) GPIO.output(R, GPIO.HIGH) remoIO.send('ok for 1\t') elif command=='2\n': GPIO.output(Y, GPIO.LOW) time.sleep(2) GPIO.output(Y, GPIO.HIGH) remoIO.send('ok for 2\t') elif command=='3\n': GPIO.output(W, GPIO.LOW) time.sleep(2) GPIO.output(W, GPIO.HIGH) remoIO.send('ok or 3\t') elif command=='quit\n': remoIO.send('end remote control!\r\n') remoIO.end() break else: remoIO.send('eroor input!\r\n') while times>0: if 0==times%2: GPIO.output(R, GPIO.HIGH) #or output(R, GPIO.True) else: GPIO.output(R, GPIO.LOW) time.sleep(delay) times-=1 return if __name__ == '__main__': blink(10, 0.5)
posted on 2012-09-22 01:44 rainduck 阅读(18170) 评论(0) 编辑 收藏 举报