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MicroPython-Hack-piezo (voir la source)
Version du 21 février 2016 à 13:02
, 21 février 2016 à 13:02→Faire encore mieux
== Faire encore mieux ==
== Faire encore mieux ==
Dans le code ci-dessous, nous allons transformer le code présenté ci-dessus en classe (plus pratique à manipuler) et présenter une seconde mélodie :-) .
<nowiki># Commande d'un Piezo Buzzer à l'aide de MicroPython PyBoard
# Drive a Piezo Buzzer with MicroPython Pyboard
# http://shop.mchobby.be/product.php?id_product=57
#
# Voir Tutoriel - See our french tutorial
# http://wiki.mchobby.be/index.php?title=MicroPython-Hack-piezo
# Voir les tutoriels "Pyb Discovery Kit" / see the "Pyb Discovery Kit" tutorials
# http://wiki.mchobby.be/index.php?title=MicroPython.Pyboard.Discovery
#
from pyb import Pin, Timer, udelay
class Piezo:
""" Driver piezo buzzer wired on a PWM Pin
Use the Pin Y2 by default, wire the piezo with a 100 Ohms resistor """
notes = { ' ' : 0, # silence,
'c' : 261, # Do
'd' : 294, # Ré
'e' : 329, # Mi
'f' : 349, # Fa
'g' : 392, # Sol
'a' : 440, # La
'b' : 493, # Si
'C' : 523 # Do
}
def __init__(self, tempo=300, pin="Y2", timer=8, channel=2 ):
""" initialzation
:param tempo: tempo of tune. Lower the value to go faster
:param pin: name of the piezo pin
:param timer: timer attached to the pin (to control PWM signal
:param channel: channel to use with the timer """
self._tempo = tempo
self.p = Pin( pin )
self.tim = Timer( timer, freq=3000 )
self.ch = self.tim.channel( channel, Timer.PWM, pin=self.p )
def get_tempo( self ):
return self._tempo
def set_tempo( self, value ):
self._tempo = value
tempo = property( get_tempo, set_tempo )
def play_tone(self, freq ):
""" play a given tone (frequency) on the piezo """
if freq == 0:
self.ch.pulse_width_percent( 0 )
else:
self.tim.freq( freq )
self.ch.pulse_width_percent( 30 )
def no_tone( self ):
self.play_tone( 0 )
def play_note(self, note, duration ):
""" Play a note identified by a letter for a given duration """
# Transforme la note en frequence
freq = self.notes[ note ]
self.play_tone( freq )
# Transforme la duree en temp (1=1000micros, 2=2000micros, etc)
udelay( duration * 1000 ) # temps en micro-second
# Joue une mélodie encodée dans une chaine de caractere
def play_tune( self, tune_string ):
""" play a tune stored within a comma separated string.
each item being a note letter + duration digit (1 digit acting as time multiplier).
If the duration digit is missing then it is replaced by the value 1
:param tune_string: eg "c2,c,d3,c3,f3,e3,c2,c,d3,c3,g3,f3, 4" where the space is a blank sound """
tune_list = tune_string.split( ',' )
duration = 1
for tune_item in tune_list:
# print( tune_item )
if len( tune_item )>1:
try:
duration = int( tune_item[1:] )
except:
raise ValueError( 'Invalid duration %s for note %s' % (tune_item[1:], tune_item[0]) )
else:
duration = 1
# Jouer la note
self.play_note( tune_item[0], self._tempo * duration )
# Pause entre 2 notes
self.no_tone()
udelay( (self._tempo * 1000) // 2 )
# a Tune is stored within a comma separated string.
# * Each item being a note letter + duration digit (acting as tempo time multiplier).
# * If the duration digit is missing then it is replaced by the value 1
#
piezo = Piezo( tempo = 300 )
piezo.play_tune( "c,c,g,g,a,a,g2,f,f,e,e,d,d,c2, 4" )
piezo.tempo = 150
piezo.play_tune( "c2,c,d3,c3,f3,e3,c2,c,d3,c3,g3,f3, 4" )</nowiki>
== Internet ==
== Internet ==