按钮功能

Question

这个Python和GUI东西（tkinter）刚好陌生，已经进行了大约3天的工作，并且用光了我的资源，我要做的就是单击“开始”按钮并使我的螺线管打开并运行，然后单击“停止”使其停止...

import RPi.GPIO as GPIO
import time
from tkinter import *
import tkinter.font as font

root = Tk()
root.geometry('500x500')                #size of window



class Cycle:
    def __init__(self, master):
        frame = Frame(master)
        frame.pack()

        myFont = font.Font(size=20)     #define Font


        self.printButton = Button(frame, text="Start", bg="green", fg="black", command = self.printMessage,width=20, height=5)
        self.printButton['font'] = myFont
        self.printButton.pack()


        self.quitButton = Button(frame, text ="Stop", bg="red", fg="black", command =frame.quit, width=20, height=5)
        self.quitButton['font'] = myFont
        self.quitButton.pack()


    def printMessage(self):
        print("Well Done!!!")

root.mainloop()


channel = 21

# GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setup(channel, GPIO.OUT)

def solenoid_on(pin):
    GPIO.output(pin, GPIO.HIGH)   # Turn solenoid on


def solenoid_off(pin):
    GPIO.output(pin, GPIO.LOW)    # Turn solenoid off

if __name__ == '__main__':
        try:
            for i in range(2):        # Number of times ran is writen in ==> [range(put run times here)]
                solenoid_on(channel)
                time.sleep(1)         # Sets lag time
                solenoid_off(channel)
                time.sleep(1)         # Sets run time
            print("Cycles", i+1)

            GPIO.cleanup()

        except KeyboardInterrupt:
            GPIO.cleanup() 

Answer 1

将两个按钮的回调更改为正确的功能。

self.printButton = Button(frame,
                              text="Start",
                              bg="green",
                              fg="black",
                              command=lambda: solenoid_on(21),
                              width=20,
                              height=5)

和

self.printButton = Button(frame,
                              text="Start",
                              bg="red",
                              fg="black",
                              command=lambda: solenoid_off(21),
                              width=20,
                              height=5)

然后使用

实例化Cycle

c = Cycle(root)

在开始事件循环之前。