启动和停止python脚本,但运行设定的时间

时间:2016-03-18 16:37:19

标签: python raspberry-pi

我有一个连接到树莓派的线性执行器,通过按钮按下打开和关闭。我希望那个执行器移动一段规定的时间。示例:我希望执行器运行的总时间为5秒。如果用户按下按钮以启动执行器,则它开始移动。然后在3秒后用户再次按下按钮停止。然后,如果他们再次推动它,它会开始移动,并在5秒后自动停止。这是我用按钮运行电机的代码,我只是想现在整合时序。有什么想法吗?

from Adafruit_MotorHAT import Adafruit_MotorHAT, Adafruit_DCMotor
import RPi.GPIO as GPIO
import atexit
from time import sleep
from threading import Thread

GPIO.setmode(GPIO.BCM)
GPIO.setup(23,GPIO.IN)
GPIO.setup(24,GPIO.IN)

# create a default object, no changes to I2C address or frequency
mh = Adafruit_MotorHAT(addr=0x60)

# recommended for auto-disabling motors on shutdown!
def turnOffMotors():
   mh.getMotor(1).run(Adafruit_MotorHAT.RELEASE)
   mh.getMotor(2).run(Adafruit_MotorHAT.RELEASE)
   mh.getMotor(3).run(Adafruit_MotorHAT.RELEASE)
   mh.getMotor(4).run(Adafruit_MotorHAT.RELEASE)

atexit.register(turnOffMotors)

################################# DC motor test!
myMotor = mh.getMotor(3)

# set the speed to start, from 0 (off) to 255 (max speed)
myMotor.setSpeed(255)
myMotor.run(Adafruit_MotorHAT.FORWARD);
# turn on motor
myMotor.run(Adafruit_MotorHAT.RELEASE);


snooziness = 5
stateOn = 0
stateOff = 0
while (True):

    if(GPIO.input(23)== False) and (stateOn==0):
       myMotor.run(Adafruit_MotorHAT.FORWARD)
       sleep(snooziness)
       myMotor.run(Adafruit_MotorHAT.RELEASE)
       stateOn=1

    if(GPIO.input(23)== False) and (stateOn==1):
       myMotor.run(Adafruit_MotorHAT.RELEASE)
       stateOn=0


    if(GPIO.input(24)== False) and (stateOff==0):
       myMotor.run(Adafruit_MotorHAT.BACKWARD)
       sleep(snooziness)
       myMotor.run(Adafruit_MotorHAT.RELEASE)
       stateOff=1

    if(GPIO.input(24)== False) and (stateOff==1):
       myMotor.run(Adafruit_MotorHAT.RELEASE)
       stateOn=0

    continue

1 个答案:

答案 0 :(得分:0)

可能是这样的:

import time

running = False
stop_time = None

while(True):
    if(buttonPushed()):
        if running:
            running = False
            stop_motor()
            stop_time = None
        else
            running = True
            start_motor()
            stop_time = time.time() + 5
    if stop_time is not None and time.time() > stop_time():
        running = False
        stop_motor()
        stop_time = None

我认为这证明了我使用的逻辑,尽管那里显然有一些可以整理的代码冗余