Question

你好，下午好。我对编程非常感兴趣。我有一个朋友帮我一个python脚本，当按下按钮时，它会打开一个led并发送一封电子邮件。当按下按钮并保持超过2秒并释放时，它应该转动LED并发送单独的电子邮件。第一个＆＃34;正常＆＃34;即使按下按钮，每次都会发送电子邮件，但重要的是＆＃34;重要的＆＃34;电子邮件没有发送，但是led确实关闭了。我在Raspberry PI 3上运行Ubuntu Mate 这是脚本的一部分。

import RPi.GPIO as GPIO
import time
import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEText import MIMEText
import datetime



body = "Email message"
sender = "Room 202 Help"
subject = "Room 202 Help Button"
to = ""
stmpAddress = "smtp.gmail.com"
username = ""
password = ""
normalBody = "Help needed in room 202"
importantBody = "Request Canceled Room 202"
ledPin = 23
buttonPin = 18
importantPress = 2 #seconds


GPIO.setmode(GPIO.BCM)

GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) #makes the pin stay high another words it is set to about 3 volts
GPIO.setup(ledPin, GPIO.OUT) #makes the pin be an output

msg = MIMEMultipart()
msg['From'] = sender
msg['To'] = to
msg['Subject'] = subject
GPIO.output(ledPin,GPIO.LOW)

while True:
    buttonPress = GPIO.input(buttonPin)
    if buttonPress == False: #is the pin low?
        GPIO.output(ledPin,GPIO.HIGH)#turn on the led
        print('Button Pressed')#Yes it is low meaning it was shorted to ground
        buttonPressStart = datetime.datetime.now() #Time the button got pressed
        while GPIO.input(buttonPin) == False: # while it is still low
            time.sleep(0.1)#stay here till they let go of the button
        buttonPressEnd = datetime.datetime.now() # time the button was let go

        diff = buttonPressEnd - buttonPressStart#the differnce of when the button got pressed and let go, duration on button press

        if diff > datetime.timedelta(seconds = importantPress):
            msg.attach(MIMEText(importantBody, 'plain'))
            GPIO.output(ledPin,GPIO.LOW)#turn off the led if it's on
            print("Canceling")
        else:
            msg.attach(MIMEText(normalBody, 'plain'))

        server = smtplib.SMTP(stmpAddress, 587)
        server.starttls()
        server.login(username, password)
        server.sendmail(username, to, msg.as_string())
        server.quit()#email sent



    time.sleep(0.01)#sleep a short time so to not eat all resources

Answer 1

在the Raspberry Pi forum上发布的答案中，您可以看到按下按钮的时间长度：

while True:
    GPIO.wait_for_edge(PIN, GPIO.FALLING)
    print "Pressed"
    start = time.time()
    time.sleep(0.2)

    while GPIO.input(PIN) == GPIO.LOW:
        time.sleep(0.01)
    length = time.time() - start
    print length

当按下按钮时，我的python脚本无法完全发送电子邮件

1 个答案: