from machine import Pin, PWM
from utime import sleep

# Connect servo to pin 21 using PWM
servo1 = PWM(Pin(21), freq=50)

# Move servo to the left
servo1.duty(30)   # Small number = left
sleep(1)          # Wait 1 second

# Move servo to the middle
servo1.duty(50)   # Middle position
sleep(1)

# Move servo to the right
servo1.duty(70)   # Big number = right
sleep(1)

# Back to middle
servo1.duty(50)