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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
HT16K33.py	4.41 KB	-rw-r--r--
__init__.py	1.09 KB	-rw-r--r--
alphanum4.py	8.01 KB	-rw-r--r--
apa102.py	3.59 KB	-rw-r--r--
bmp280.py	7.41 KB	-rw-r--r--
buzzer.py	2.01 KB	-rw-r--r--
lights.py	1.83 KB	-rw-r--r--
touch.py	2.77 KB	-rw-r--r--

Code Editor : buzzer.py

from threading import Timer

try:
    import RPi.GPIO as GPIO
except ImportError:
    raise ImportError("This library requires the RPi.GPIO module\nInstall with: sudo pip install RPi.GPIO")

BUZZER = 13

_timeout = None

_is_setup = False

pwm = None

def setup():
    global _is_setup, pwm

if _is_setup:
        return

GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)
    GPIO.setup(BUZZER, GPIO.OUT)

# Set up the PWM and then set the pin to input
    # to prevent the signal from being output.
    # Since starting/stopping PWM causes a segfault,
    # this is the only way to manage the buzzer.

pwm = GPIO.PWM(BUZZER, 1)
    GPIO.setup(BUZZER, GPIO.IN)
    pwm.start(50)

_is_setup = True

def note(frequency, duration=1.0):
    """Play a single note.

:param frequency: Musical frequency in hertz
    :param duration: Optional duration in seconds, use None to sustain note

"""

global _timeout

setup()

if frequency <= 0:
        raise ValueError("Frequency must be > 0")

if duration is not None and duration <= 0:
        raise ValueError("Duration must be > 0")

clear_timeout()

pwm.ChangeFrequency(frequency)
    GPIO.setup(BUZZER, GPIO.OUT)

if duration is not None and duration > 0:
        _timeout = Timer(duration, stop)
        _timeout.start()

def midi_note(note_number, duration=1.0):
    """Play a single note by MIDI note number.

Converts a MIDI note number into a frequency and plays it. A5 is 69.

:param note_number: MIDI note number of note
    :param duration: Optional duration in seconds, use None to sustain note

"""

freq = (2**((note_number-69.0)/12)) * 440

note(freq, duration)

def clear_timeout():
    """Clear any note timeout set.

Will cause any pending playing note to be sustained.

"""

global _timeout

if _timeout is not None:
        _timeout.cancel()
        _timeout = None

def stop():
    """Stop buzzer.

Immediately silences the buzzer.

"""

clear_timeout()

GPIO.setup(BUZZER, GPIO.IN)

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Code Editor : buzzer.py