# -*- coding: utf-8 -*-


buzzer_pin = 19
notes = {"C":256, "D",288,"E":324,"F":345,"G":385,"A":432,"B":485,"CC":513}

def buzz(pitch, duration):   #create the function “buzz” and feed it the pitch and duration)
    global buzzer_pin
    if pitch == 0:
        time.sleep(duration)
        return
    period = 1.0 / pitch     #in physics, the period (sec/cyc) is the inverse of the frequency (cyc/sec)
    delay = period / 2     #calcuate the time for half of the wave  
    cycles = int(duration * pitch)   #the number of waves to produce is the duration times the frequency

    for i in range(cycles):    #start a loop from 0 to the variable “cycles” calculated above
        GPIO.output(buzzer_pin, True)   #set pin 18 to high
        time.sleep(delay)    #wait with pin 18 high
        GPIO.output(buzzer_pin, False)    #set pin 18 to low
        time.sleep(delay)    #wait with pin 18 low

def play(note, beats):
    global notes
    tone = notes[note]
    duration = .5 * beats
    buzz(tone, duration)
    
play("C",4)
play("E",4)
play("G",4)
play("CC",4)