from machine import Pin, PWM
from time import sleep

servo = PWM(Pin(15))  # GPIO15
servo.freq(50)        # Standard servo PWM frequency (50 Hz)

def set_angle(angle):
    # Map 0–180° to duty cycle range (~0.5ms–2.5ms pulse width)
    duty = int((angle / 180) * 6500 + 1500)  
    servo.duty_u16(duty)

while True:
    for angle in range(0, 181, 10):
        set_angle(angle)
        sleep(0.1)
    for angle in range(180, -1, -10):
        set_angle(angle)
        sleep(0.1)