#!/usr/bin/python3

from sysfs_pwm import Pwm  # https://pastebin.com/R70P1wAn

# initialize and enable pwm, automatically disable when scope is left
with Pwm('/dev/bone/pwm/1/a', frequency=20000, value=0) as pwm:
    while True:
        pwm.value = float(input("Enter PWM value (between 0.0 and 1.0): "))