3
这是我第一次尝试在面包板上编码Raspberry Pi和硬件按钮。该程序很简单,当检测到按钮按下时,打开面包板上的LED 1秒钟。我的代码似乎工作,但奇怪的是每经常一个按钮推动触发回调函数两次。我是一个总编程noob,所以我不确定问题是否与我的代码,或者如果硬件或按钮实际上下降两次。我希望这里有人能帮我解决这种奇怪的问题。这里是我的代码:按钮GPIO.FALLING事件触发两次
#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
LedPin = 11 # pin11 --- led
BtnPin = 12 # pin12 --- button
def setup():
GPIO.setmode(GPIO.BOARD) # Numbers GPIOs by physical location
GPIO.setup(LedPin, GPIO.OUT) # Set LedPin's mode is output
GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) # Set BtnPin's mode is input, and pull up to high level(3.3V)
GPIO.output(LedPin, GPIO.HIGH) # Set LedPin high(+3.3V) to off led
def Light(ev=None):
print 'A button press was detected'
GPIO.output(LedPin, 0) # switch led status on
time.sleep(1)
GPIO.output(LedPin, 1) # switch led status off
def loop():
GPIO.add_event_detect(BtnPin, GPIO.FALLING, callback=Light) # wait for Button Press (GPIO Falling)
while True:
pass # Don't do anything, sit forever
def destroy():
GPIO.output(LedPin, GPIO.HIGH) # led off
GPIO.cleanup() # Release resource
if __name__ == '__main__': # Program start from here
setup()
try:
loop()
except KeyboardInterrupt: # When 'Ctrl+C' is pressed, the child program destroy() will be executed.
destroy()
为什么你永远循环循环? –
我需要我的代码连续运行。如果你有更好的方法来做到这一点,我很乐意尝试另一种方法.. – szaske
但是,你应该不是在听循环中的事件吗? –