from utime import sleep
sleep(0.1) # Wait for USB to become ready

from machine import Pin, PWM
import random

buzzer = PWM(Pin(1))

def play_tone(frequency):
    buzzer.duty_u16(1000)
    buzzer.freq(frequency)

def be_quiet():
    buzzer.duty_u16(0)

while True:
    random_freq = random.randint(100, 10000)
    play_tone(random_freq)
    sleep(0.5)
    be_quiet()
    sleep(0.25)