def main(addon):
badge.show_bitmap('drivers/assets/speaker.bmp')
audio = PWMOut(board.GPIO1,
duty_cycle=0,
frequency=440,
variable_frequency=True)
led = digitalio.DigitalInOut(board.GPIO2)
led.switch_to_output(True)
try:
for (notename, eigths) in sequence:
length = eigths * 0.1
if notename:
led.value = False
audio.frequency = round(note(notename))
audio.duty_cycle = 0x8000
time.sleep(length)
led.value = True
audio.duty_cycle = 0
time.sleep(0.025)
time.sleep(3)
finally:
led.deinit()
audio.deinit()
class PWMOut(object):
"""PWM output."""
def __init__(self, pin, freq=5000, duty=0):
self._pID = pin
self._pin = PWMOut_(pin, frequency=int(freq), duty_cycle=duty)
def deinit(self):
self._pin.deinit()
@property
def duty_percent(self):
""" duty in percent
"""
return self._pin.duty_cycle /MAX_DUTY *100
@duty_percent.setter
def duty_percent(self, value):
self._pin.duty_cycle = int(min(max(0, value/100.0 *MAX_DUTY), MAX_DUTY))
@property
def duty(self):
""" duty as raw value
"""
return self._pin.duty_cycle
@duty.setter
def duty(self, value):
self._pin.duty_cycle = int(value)
@property
def freq_Hz(self):
""" frequency in [Hz]
"""
return self._pin.frequency
@freq_Hz.setter
def freq_Hz(self, value):
# Frequency cannot be changed unless variable frequency option is set,
# therefore here just recreate instance with same duty cycle but new
# frequency
d = self._pin.duty_cycle
self._pin.deinit()
self._pin = PWMOut_(self._pID, frequency=int(value), duty_cycle=d)
@property
def max_duty(self):
return MAX_DUTY