from machine import Pin, PWM
import time

# Create PWM on pin 2 at 50Hz (standard servo frequency)
servo = PWM(Pin(2), freq=50)

def set_angle(angle):
    # angle should be 0-180
    # Convert angle to duty cycle for 0.5–2.5 ms pulse width
    min_us = 500
    max_us = 2500
    us = min_us + (max_us - min_us) * angle // 180
    duty = int(us / 20000 * 1023)  # 20ms period at 50Hz
    servo.duty(duty)

# Example: sweep servo
while True:
    for angle in range(0, 181, 30):   # 0 → 180
        set_angle(angle)
        time.sleep(1)
    for angle in range(180, -1, -30): # 180 → 0
        set_angle(angle)
        time.sleep(1)