print("Hello, ESP32!")
from machine import Pin,PWM
import utime
pwm=PWM(Pin(15,Pin.OUT))
pwm.freq(50)
for pos in range(0,181):
    print(pos,end=" ")
    ts=int((pos/180*2+0.5)/20*1023)
    pwm.duty(ts)
    utime.sleep(0.1)
for pos in range(180,-1,-1):
    print(pos,end=" ")
    ts=int((pos/180*2+0.5)/20*1023)
    pwm.duty(ts)
    utime.sleep(0.25)