# Import Pin and PWM modules to control pins and use Pulse Width Modulation
from machine import Pin, PWM   

# Import time functions to add delays (seconds and milliseconds)
from utime import sleep, sleep_ms 

# Create a PWM signal on pin 21 with a frequency of 50Hz (for servo motor)
servo1 = PWM(Pin(21), freq=50)    

# Repeat the following 100 times
for i in range(100):     

     # Change the PWM duty cycle to 'i' (this moves the servo position)         
    servo1.duty(i)   

    # Print the current duty value to the console for observation            
    print(i)    

    # Wait for 15 milliseconds to allow the servo to move smoothly           
    sleep_ms(15)