from machine import Pin, PWM
import time

buzzer = PWM(Pin(8))

# Set the duty cycle (volume) to 50% to create a square wave.
# MicroPython uses 16-bit integers for duty cycle (0 to 65535).
# 50% of 65535 is roughly 32768.
buzzer.duty_u16(32768) 

while True:
    # 1000 Hz tone
    buzzer.freq(1000)
    time.sleep(0.5)
    
    # 600 Hz tone
    buzzer.freq(600)
    time.sleep(0.5)