增加buzzer库

Digital/buzzer.py

+from machine import PWM
+
+Freq = (30000,1046,1174,1318,1396,1567,1780,1975,2085)
+class Music:
+    def __init__(self,pwm1):
+        self.pwm = pwm1
+                
+    def music(self, number):
+        self.pwm.freq(Freq[number])
+        self.pwm.duty_u16(5000)
\ No newline at end of file

example/music.py

+from machine import Pin,PWM
+from buzzer import Music
+from time import sleep
+
+pwm = PWM(Pin(27))
+mu = Music(pwm)
+
+mu.music(8)
+sleep(1)
+mu.music(7)
+sleep(1)
+mu.music(6)
+sleep(1)
+mu.music(5)
+sleep(1)
+mu.music(4)
+sleep(1)
+mu.music(3)
+sleep(1)
+mu.music(2)
+sleep(1)
+mu.music(1)
+sleep(1)
+mu.music(0)
+
+
+