wlpython 2019-02-18
在做毕业设计的过程中,想对多个传感器让他们同时并发执行。之前想到
light_red()
light_blue()
分别在两个shell脚本中同时运行,但是这样太麻烦了。后来学到了Python多线程,让程序并发执行。
下面具体介绍步骤:
两个led灯,一个蓝灯,一个红灯
蓝灯正极接13,负极接14
红灯正极接12,负极接14
下面是代码:
#!/usr/bin/python # -*- coding: UTF-8 -*- import RPi.GPIO as GPIO import threading import time class led_blue(threading.Thread): #继承父类threading.Thread def __init__(self, threadID, name, counter): threading.Thread.__init__(self) self.threadID = threadID self.name = name self.counter = counter def run(self): #把要执行的代码写到run函数里面 线程在创建后会直接运行run函数 print "Starting " + self.name led_blue_on() print "Exiting " + self.name class led_red (threading.Thread): #继承父类threading.Thread def __init__(self, threadID, name, counter): threading.Thread.__init__(self) self.threadID = threadID self.name = name self.counter = counter def run(self): #把要执行的代码写到run函数里面 线程在创建后会直接运行run函数 print "Starting " + self.name led_red_on() print "Exiting " + self.name def led_blue_on(): PIN_NO=13 GPIO.setmode(GPIO.BOARD) GPIO.setup(PIN_NO, GPIO.OUT) GPIO.output(PIN_NO,GPIO.HIGH) def led_red_on(): PIN=12 GPIO.setmode(GPIO.BOARD) GPIO.setup(PIN, GPIO.OUT) GPIO.output(PIN,GPIO.HIGH) # 创建新线程 thread1 = led_blue(1, "light_blue_on_on", 1) thread2 = led_red(2, "light_red_on", 2) # 开启线程 thread1.start() thread2.start() print "Exiting Main Thread" time.sleep(20) GPIO.cleanup()
效果图,像素很渣: