Python脚本不读取GPI

Question

我试图在RPi的后台运行以下python脚本（mission\u buttons.py）。其目的是等待两个物理按钮（GPIO引脚23和24）上的输入，并在读取任一引脚上的逻辑HI时，将字母“x”打印到终端或调用updateemission.js

#!/usr/bin/env python

import RPi.GPIO as GPIO
import time
import subprocess

GPIO.setmode(GPIO.BCM)

GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_UP)

upload_mission = GPIO.input(23)
execute_mission = GPIO.input(24)

while(1):

    if execute_mission == True:
        print 'x'

    if upload_mission == True:
        subprocess.call(["node", "/home/pi/QRIDrone/RPIBuild/updateMission.js"], shell=False)

但是当我运行脚本时，按下按钮似乎什么也做不了。 如果我将代码调整为：

if execute_mission == False:
    print 'x'

if upload_mission == False:
    subprocess.call(["node", "/home/pi/QRIDrone/RPIBuild/updateMission.js"], shell=False)

程序打印x并按其应该的方式反复调用updateemission.js。有什么东西阻止RPi读取GPIO吗

Answer 1

1. 检查是否连接了正确的针脚

2. 您没有在while中读取upload\u mission=GPIO.input（23）。你以前只读过一次，然后就不读了
   您需要：
   

   upload_mission = GPIO.input(23)
   execute_mission = GPIO.input(24)
   while(1):
       upload_mission = GPIO.input(23)
       execute_mission = GPIO.input(24)
       if execute_mission == True:
           print 'x'
   
       if upload_mission == True:
           subprocess.call(["node", "/home/pi/QRIDrone/RPIBuild/updateMission.js"], shell=False