Python Tkinter- GPIO引脚功能不起作用

Z时代
2024-01-10
分类：问答

我是一名初学者程序员，所以我没有获得Python的大量经验。我创建了一个使用树莓派记录水位的超声波传感器系统。我的程序在控制台中工作正常，但是我想为它做一个GUI，使它更具吸引力，使用Tkinter。我之前从未使用过Tkinter，所以我不确定自己做错了什么。我做了一个按钮，应该开始正在进行的实际阅读，但是每次运行时都会收到一个错误，告诉我我无法访问GPIO，并且应该尝试以root用户身份运行 - 尽管当我这样做时，同样的错误出现。Python Tkinter- GPIO引脚功能不起作用

有没有人有任何想法，我错了或它的任何其他方式通过GUI运行？我非常感谢任何帮助，因为我已经在这个问题上停留了两个多月，非常感谢！

我得到的错误信息是这个;

"Exception in Tkinter callback 
Traceback (most recent call last): 
    File 'user/lib/python3.2/tkinter/__init__.py', line 1426, in __call__ 
      return self.func(*args) 
    File 'home.pi.tkinterproject.py', line 40 in run_code 
      GPIO.setup(GPIO.OUT) 
RuntimeErorr: No access to /dev/mem. Try running as root!"

这是代码：

from tkinter import * 
import time 
import datetime 
import RPi.GPIO as GPIO 
GPIO.setwarnings(False) 
class Window(Frame): 
def  __init__(self, master = None): 
     Frame.__init__(self, master) 
     self.master = master 
     self.init_window() 
def init_window(self): 
     self.master.title("GUI") 
     self.pack(fill=BOTH, expand=1) 
     quitButton = Button(self, text = "Quit", command = self.exit_window) 
     quitButton.place(x = 330,y = 260) 
     runButton = Button(self, text = "Run", command = self.run_code) 
     runButton.place(x = 0, y = 0) 
def exit_window(self): 
     exit() 
def run_code(self): 
     #set pins according to BCM GPIO references 
     GPIO.setmode(GPIO.BCM) 
     #set GPIO pins 
     TRIG = 23 
     ECHO = 24    
     #sets trigger to send signal, echo to recieve the signal back 
     GPIO.setup(TRIG,GPIO.OUT) 
     GPIO.setup(ECHO,GPIO.IN) 
     #sets output to low 
     GPIO.output(TRIG,False) 
     myLabell = Label(text = 'Initiating measurement').pack() 
     print ("Initiating measurement..\n") 
     #gives sensor time to settle for one second 
     time.sleep(1) 
     distance = averageReading() 
     round(distance, 2) 
     print ("Distance:", distance, "cm\n") 
     print ("Saving your measurement to file..") 
     ts = time.time() 
     timestamp = datetime.datetime.fromtimestamp(ts).strftime('  %H: %M: %S  %d-%m-%Y') 
     textFile = open("sensorReadings" , "a") 
     textFile.write(str(distance)+ "cm  recorded at: ") 
     textFile.write(str(timestamp)+ "\n") 
     textFile.close()   
     #resets pins for next time 
     GPIO.cleanup() 
global averageReading 
def averageReading(): 
     readingOne = measure() 
     time.sleep(0.1)   
     readingTwo = measure() 
     time.sleep(0.1) 
     readingThree = measure() 
     reading = readingOne + readingTwo + readingThree 
     reading = reading/3 
     return reading 
global measure   
def measure(): 
     global measure 
     #sends out the pulse to the trigger 
     GPIO.output(TRIG, True) 
     #short as possible 
     time.sleep(0.00001) 
     GPIO.output(TRIG,False) 
     while GPIO.input(ECHO) == 0: 
       pulse_start = time.time()  
     while GPIO.input(ECHO) == 1: 
       pulse_end = time.time() 
       pulse_duration = pulse_end - pulse_start 
       #half the speed of sound in cm/s 
       distance = pulse_duration * 34300 
       distance = distance/2 
       #python function that rounds measurement to two digits 
       round(distance, 2) 
       return distance 
myGUI = Tk() 
myGUI.geometry("400x300") 
app = Window(myGUI) 
myGUI.mainloop()