from machine import Pin,PWM
import utime

MID = 1500000
MIN = 1000000
MAX = 2000000

pwm = PWM(Pin(0))  #GPIO Number

pwm.freq(50)
pwm.duty_ns(MID)

while True:
    pwm.duty_ns(MIN)
    utime.sleep(1)  #Sleep Time In Seconds
    pwm.duty_ns(MID)
    utime.sleep(1)  #Sleep Time In Seconds
    pwm.duty_ns(MAX)
    utime.sleep(1)  #Sleep Time In Seconds

from machine import Pin, PWM
from time import sleep

servoPin = PWM(Pin(0))  #GPIO Pin Number
servoPin.freq(50)

def servo(degrees):
    # Limit Degrees Between 0 And 180
    if degrees > 180: degrees=180
    if degrees < 0: degrees=0
    # Set Max And Min Duty
    maxDuty=9000
    minDuty=1000
    # New Duty Is Between Min And Max Duty In Proportion To It's Value
    newDuty=minDuty+(maxDuty-minDuty)*(degrees/180)
    # Servo PWM Value Is Set
    servoPin.duty_u16(int(newDuty))

while True:
  # Start Increasing Loop
  for degree in range(0,180,1):
    servo(degree)
    sleep(0.001)
    print("increasing -- "+str(degree))
  # Start Decreasing Loop
  for degree in range(180, 0, -1):
    servo(degree)
    sleep(0.001)
    print("decreasing -- "+str(degree))