from machine import Pin, PWM
import time

# Servo pin (you connected to GPIO 18)
servo = PWM(Pin(18), freq=50)

# Function to set angle
def set_angle(angle):
    duty = int((angle / 180) * 102 + 26)  # Convert angle to duty
    servo.duty(duty)

while True:
    # 0 degree
    set_angle(0)
    time.sleep(1)

    # 90 degree
    set_angle(90)
    time.sleep(1)

    # 180 degree
    set_angle(180)
    time.sleep(1)