树莓派 LED呼吸灯

预览

接线

+接个3.3v的电源，-接18口

代码实现

#!/usr/bin/env python
# encoding: utf-8

import RPi.GPIO
import time
# 正常呼吸为3s一次，深呼吸6s一次
"""
RPi.GPIO.setmode(RPi.GPIO.BOARD)
RPi.GPIO.setup(12, RPi.GPIO.OUT)

pwm = RPi.GPIO.PWM(12, 50)
pwm.start(0)
"""
RPi.GPIO.setmode(RPi.GPIO.BCM)
RPi.GPIO.setup(18, RPi.GPIO.OUT)

pwm = RPi.GPIO.PWM(18, 50)
pwm.start(0)
try:
	while True:
		for i in xrange(0, 101, 2):
			pwm.ChangeDutyCycle(i)
			time.sleep(.03)
		for i in xrange(100, -1, -2):
			pwm.ChangeDutyCycle(i)
			time.sleep(.03)
except KeyboardInterrupt:
	pass

pwm.stop()

RPi.GPIO.cleanup()#!/usr/bin/en