Question

我正在尝试在我的RPi背景中运行以下python脚本（mission_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updateMission.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没做。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并重复调用updateMission.js。是否存在阻止RPi读取GPIO的内容？

Answer 1

检查您是否连接了正确的引脚

您没有在同时阅读upload_mission = GPIO.input（23）。你之前只读过一次然后不是你需要：

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

Python脚本无法读取GPIO

1 个答案: