from machine import Pin, PWM
import time

servo = PWM(Pin(15))  # Use GPIO15
servo.freq(50)  # Set frequency to 50Hz

def set_angle(angle):
    """Convert angle (0-180) to duty cycle (2000-8000)"""
    duty = int(2000 + (angle / 180) * 6000)
    servo.duty_u16(duty)

while True:
    set_angle(0)    # Move to 0 degrees
    time.sleep(1)
    set_angle(90)   # Move to 90 degrees
    time.sleep(1)
    set_angle(180)  # Move to 180 degrees
    time.sleep(1)