树莓派PWM编程

树莓派编程注意事项：

缩进只能用空格或者TAB，两者不能共存，否则会报错

#!/usr/bin/python3
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
# Set GPIO and PWM peripheral
GPIO.setup(2, GPIO.OUT, initial=GPIO.HIGH)
init_freq = 5  # initial frequency in Hz
pwm_BCM2 = GPIO.PWM(2, init_freq)
init_dc = 50  
pwm_BCM2.start(init_dc)

GPIO.setup(3, GPIO.IN)
blinks = 0
print('开始闪烁')
while (blinks < 5):
	if	GPIO.input(3):
		print('输入高电平')
	else:
		print('输入低电平')
	time.sleep(0.5)
	blinks = blinks + 1

GPIO.cleanup()
print('结束闪烁')

打印结果：

使用Python 的RPi.GPIO模块和WringPi库函数进行控制，PWM精度会有差异，请看https://blog.csdn.net/j353838430/article/details/86770812