树莓派gpio控制led闪烁频率

操作l298n控制电机转速时能用到,记录下来

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

import sys
reload(sys)
sys.setdefaultencoding('utf-8')

import time
import RPi.GPIO as gpio

gpio.setmode(gpio.BCM)

pin = 14

gpio.setup(pin, gpio.OUT)
pwm = gpio.PWM(pin, 50)
pwm.start(0)
try:
    while True:
        for dc in range(0, 101, 5):
            pwm.ChangeDutyCycle(dc)
            time.sleep(0.05)
        for dc in range(100, -1, -5):
            pwm.ChangeDutyCycle(dc)
            time.sleep(0.05)
except KeyboardInterrupt:
    pass

pwm.stop()
gpio.cleanup()