pwm-test.py

from time import sleep_ms
def test():
  p=PWM(0, pin=18, ms=MS_ENABLE)
  p.freq(1000)
  p.range(DEFAULT_RANGE)
  while True:
    for i in range(DEFAULT_RANGE // 2):
      p.data(i)
      sleep_ms(1)
    for i in range(DEFAULT_RANGE // 2 - 1, 0, -1):
      p.data(i)
      sleep_ms(1)
    
test()