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振动开关，也称为弹簧开关或冲击传感器，是一种电子开关，它能产生冲击力，并将结果传输给电路装置，从而触发它工作。
Introduction
工作原理如下:一旦传感器检测到震动，弹簧就会震动并与触发针接触，从而产生触发信号。可通过调节电位计用于设定触发起始程度。
当开关感应到震动信号时，LED灯会亮起来。可以用于智能小车，防盗功能等。
What you will need
- 树莓派
- 网线
- 震动传感器
- 杜邦线
What you will do
1:构建电路
将模块的DO连接到树莓派的GPIO11，VCC接+ 3.3 v，GND接0v。
2:编辑并测试代码
将双色LED模块连接到树莓派的GPIO12。当检测到震动时，将触发LED灯亮。
#!/usr/bin/env python
import RPi.GPIO as GPIO
ShockPin = 11
LedPin = 12
Led_status = 1
def setup():
GPIO.setmode(GPIO.BOARD) # Numbers GPIOs by physical location
GPIO.setup(LedPin, GPIO.OUT) # Set LedPin's mode is output
GPIO.setup(ShockPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.output(LedPin, GPIO.HIGH) # Set LedPin high(+3.3V) to off led
def swLed(ev=None):
global Led_status
Led_status = not Led_status
GPIO.output(LedPin, Led_status) # switch led status(on-->off; off-->on)
print "led: " + ("on" if Led_status else "off")
def loop():
GPIO.add_event_detect(ShockPin, GPIO.FALLING, callback=swLed, bouncetime=200) # wait for falling
while True:
pass # Don't do anything
def destroy():
GPIO.output(LedPin, GPIO.LOW) # 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()