from machine import Pin, PWM
import time

# Set GPIO15 as a PWM pin
servo = PWM(Pin(15))
servo.freq(50)   # Standard servo frequency

def set_angle(angle):
    # Convert angle (0–180) to duty cycle (1638 to 8192)
    min_duty = 1638   # 0.5 ms pulse
    max_duty = 8192   # 2.5 ms pulse

    duty = int(min_duty + (angle / 180) * (max_duty - min_duty))
    servo.duty_u16(duty)

while True:
    for angle in range(0, 181, 10):
        set_angle(angle)
        time.sleep(0.05)

    for angle in range(180, -1, -10):
        set_angle(angle)
        time.sleep(0.05)