from machine import Pin,PWM 
import time

Beep = PWM(Pin(2), freq = 1, duty = 128)

t1 = 500
t2 = 100
while 1:
    def fun_():
        Beep.freq(262) #1
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
        Beep.freq(262) #2
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
        Beep.freq(393) #3
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
        Beep.freq(393) #4
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
        Beep.freq(441) #5
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
        Beep.freq(441) #6
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
        Beep.freq(393) #7
        time.sleep_ms(t1)
        Beep.duty(0)
        time.sleep_ms(t2)
        Beep.duty(128)
    fun_()
Beep.deinit() #停止