def tone(pin, frequency, duration=1, length=100):
"""
Generates a square wave of the specified frequency on a pin
:param ~microcontroller.Pin pin: Pin on which to output the tone
:param float frequency: Frequency of tone in Hz
:param int length: Variable size buffer (optional)
:param int duration: Duration of tone in seconds (optional)
"""
if length * frequency > 350000:
length = 350000 // frequency
try:
# pin with PWM
# pylint: disable=no-member
with pwmio.PWMOut(pin,
frequency=int(frequency),
variable_frequency=False) as pwm:
pwm.duty_cycle = 0x8000
time.sleep(duration)
# pylint: enable=no-member
except ValueError:
# pin without PWM
sample_length = length
square_wave = array.array("H", [0] * sample_length)
for i in range(sample_length / 2):
square_wave[i] = 0xFFFF
square_wave_sample = audiocore.RawSample(square_wave)
square_wave_sample.sample_rate = int(len(square_wave) * frequency)
with AudioOut(pin) as dac:
if not dac.playing:
dac.play(square_wave_sample, loop=True)
time.sleep(duration)
dac.stop()
def _play_to_pin(tune, base_tone, min_freq, duration, octave, tempo):
"""Using the prepared input send the notes to the pin
"""
pwm = isinstance(base_tone, pulseio.PWMOut)
for note in tune.split(","):
piano_note, note_duration = _parse_note(note, duration, octave)
if piano_note in PIANO:
if pwm:
base_tone.frequency = int(PIANO[piano_note])
base_tone.duty_cycle = 2**15
else:
# AudioOut interface changed in CP 3.x
if sys.implementation.version[0] >= 3:
pitch = int(PIANO[piano_note])
sine_wave = sine.sine_wave(16000, pitch)
sine_wave_sample = audiocore.RawSample(sine_wave)
base_tone.play(sine_wave_sample, loop=True)
else:
base_tone.frequency = int(16000 *
(PIANO[piano_note] / min_freq))
base_tone.play(loop=True)
time.sleep(4 / note_duration * 60 / tempo)
if pwm:
base_tone.duty_cycle = 0
else:
base_tone.stop()
time.sleep(0.02)
def waveform_sawtooth(length, waves, volumes):
for vol in volumes:
waveraw = array.array("H", [
midpoint +
round(vol * sawtooth((idx + 0.5) / length * twopi + math.pi))
for idx in list(range(length))
])
waves.append((audiocore.RawSample(waveraw), waveraw))
def _generate_sample(self, length=100):
if self._sample is not None:
return
self._sine_wave = array.array("H", Express._sine_sample(length))
if sys.implementation.version[0] >= 3:
self._sample = audioio.AudioOut(board.SPEAKER)
self._sine_wave_sample = audiocore.RawSample(self._sine_wave)
else:
raise NotImplementedError(
"Please use CircuitPython 3.0 or higher.")
def __init__(self):
self.duration = 0
self.start = 0
tone_volume = 1 # volume is from 0.0 to 1.0
frequency = 440 # Set this to the Hz of the tone you want to generate.
length = 4000 // frequency
sine_wave = array.array("H", [0] * length)
for i in range(length):
sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / length)) *
tone_volume * (2**15 - 1))
self.sine_wave_sample = audiocore.RawSample(sine_wave)
def _generate_sample(self, length=100):
if AUDIO_ENABLED:
if self._sample is not None:
return
self._sine_wave = array.array("H",
PyBadgerBase._sine_sample(length))
# pylint: disable=not-callable
self._sample = self._audio_out(board.SPEAKER) # pylint: disable=not-callable
self._sine_wave_sample = audiocore.RawSample(self._sine_wave)
else:
print("Required audio modules were missing")
def __init__(self):
self.duration = 0
self.start = 0
tone_volume = 1 # volume is from 0.0 to 1.0
frequency = 440 # Set this to the Hz of the tone you want to generate.
length = 4000 // frequency
sine_wave = array.array("H", [0] * length)
for i in range(length):
sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / length)) *
tone_volume * (2**15 - 1))
self.sine_wave_sample = audiocore.RawSample(sine_wave)
self._speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
self._speaker_enable.switch_to_output(False)
if hasattr(board, "AUDIO_OUT"):
self.audio = audioio.AudioOut(board.AUDIO_OUT)
elif hasattr(board, "SPEAKER"):
self.audio = audioio.AudioOut(board.SPEAKER)
else:
raise AttributeError("Board does not have a builtin speaker!")
def update(self, shape, frequency):
if shape == self.shape and frequency == self.frequency:
return
if frequency != self.frequency:
self.reallocate(frequency)
self.frequency = frequency
self.shape = shape
if shape == shapes.SINE:
self.make_sine()
elif shape == shapes.SQUARE:
self.make_square()
elif shape == shapes.TRIANGLE:
self.make_triangle()
elif shape == shapes.SAWTOOTH:
self.make_sawtooth()
self.dac.stop()
self.dac.play(audiocore.RawSample(self.sample,
channel_count=1,
sample_rate=64000),
loop=True)
def _generate_sample(self, length=100):
if self._sample is not None:
return
self._sine_wave = array.array("H", self._sine_sample(length))
self._sample = audiopwmio.PWMAudioOut(board.SPEAKER)
self._sine_wave_sample = audiocore.RawSample(self._sine_wave)
### Keep x position within legal values (if needed)
##dac_a0_x = min(dac_a0_x, dac_x_max)
##dac_a0_x = max(dac_a0_x, 0)
dac_a1_y = round((sine * pcy + cosine * pcx + halfrange_y) * mult_y)
### Keep y position within legal values (if needed)
##dac_a1_y = min(dac_a1_y, dac_y_max)
##dac_a1_y = max(dac_a1_y, 0)
rawdata[idx] = dac_a0_x - dac_x_mid ### adjust for "h" array
rawdata[idx + 1] = dac_a1_y - dac_y_mid ### adjust for "h" array
idx += 2
if use_wav:
### 200k (maybe 166.667k) seems to be practical limit
### 1M permissible but seems same as around 200k
output_wave = audiocore.RawSample(rawdata,
channel_count=2,
sample_rate=200 * 1000)
### The image may "warp" sometimes with loop=True due to a strange bug
### https://github.com/adafruit/circuitpython/issues/1992
if poor_wav_bug_workaround:
while True:
dacs.play(output_wave)
if time.monotonic() - prev_t >= frame_t:
break
else:
dacs.play(output_wave, loop=True)
while time.monotonic() - prev_t < frame_t:
pass
if not leave_wav_looping:
dacs.stop()
def _generate_sample(self, length=100):
if self._sample is not None:
return
self._sine_wave = array.array("H", PyBadgerBase._sine_sample(length))
self._sample = self._audio_out(board.SPEAKER) # pylint: disable=not-callable
self._sine_wave_sample = audiocore.RawSample(self._sine_wave)
Update the following pin names to a viable pin combination:
* BIT_CLOCK_PIN
* WORD_SELECT_PIN
* DATA_PIN
"""
import time
import array
import math
import audiocore
import board
import audiobusio
audio = audiobusio.I2SOut(board.BIT_CLOCK_PIN, board.WORD_SELECT_PIN,
board.DATA_PIN)
tone_volume = 0.1 # Increase this to increase the volume of the tone.
frequency = 440 # Set this to the Hz of the tone you want to generate.
length = 8000 // frequency
sine_wave = array.array("h", [0] * length)
for i in range(length):
sine_wave[i] = int(
(math.sin(math.pi * 2 * i / length)) * tone_volume * (2**15 - 1))
sine_wave_sample = audiocore.RawSample(sine_wave)
while True:
audio.play(sine_wave_sample, loop=True)
time.sleep(1)
audio.stop()
time.sleep(1)
timeout = time.monotonic()
while True:
print((light.value, ))
# determine height of pixels
pixel_height = map_range(light.value, DARK, BRIGHT, 0, num_pixels)
pixels.fill((0, 0, 0))
for p in range(pixel_height):
pixels[p] = wheel(int(p / num_pixels * 255))
pixels.show()
# determine squeek
freq = int(map_range(light.value, DARK, BRIGHT, 440, 8800))
sine_wave = audiocore.RawSample(wave_array,
channel_count=1,
sample_rate=freq)
cpx_audio.stop()
cpx_audio.play(sine_wave, loop=True)
# check no activity
if light.value > ACTIVITY_THRESHOLD:
timeout = time.monotonic() # reset our timeout
# 4 seconds no activity
if time.monotonic() - timeout > 4:
break
pixels.fill((255, 0, 0))
pixels.show()
play_file("03_no_sanctuary.wav")
# This generates a raw set of samples that represents one full
# cycle of a sine wave. If you wanted different waveforms, you
# could change the formula here to generate that instead.
def generate_noise(volume=1.0):
volume = volume * (2 ** 15 - 1) # Increase this to increase the volume of the tone.
length = 800
samples = array.array("H", [0] * length)
for i in range(length):
samples[i] = int(random.random() * volume)
return samples
noise = generate_noise(0.8)
sample = audiocore.RawSample(noise)
# Change this to set the noise sample's frequency.
# This generate works well as pretty low numbers,
# but you can get some interesting effects at higher
# values.
frequency = 2
sample.sample_rate = frequency * len(noise)
while True:
if bhb.triggered:
bhb.gate_out = True
bhb.play(sample, loop=True)
if bhb.released:
# Plays a simple 8ksps 440 Hz sin wave
#
# Adapted from "Audio output via digital PWM article"
# https://circuitpython.readthedocs.io/en/latest/shared-bindings/audiopwmio/index.html
# for Maker Pi Pico
#
# Copy this file to Maker Pi Pico CIRCUITPY drive as code.py to run it on power up.
#
import audiocore
import audiopwmio
import board
import array
import time
import math
# Generate one period of sine wav.
length = 8000 // 440
sine_wave = array.array("H", [0] * length)
for i in range(length):
sine_wave[i] = int(math.sin(math.pi * 2 * i / length) * (2**15) + 2**15)
dac = audiopwmio.PWMAudioOut(board.GP18)
sine_wave = audiocore.RawSample(sine_wave, sample_rate=8000)
dac.play(sine_wave, loop=True)
time.sleep(1)
dac.stop()
trigger.switch_to_output(True)
# Generate one period of sine wav.
length = 8000 // 440
samples = []
sample_names = [
"unsigned 8 bit", "signed 8 bit", "unsigned 16 bit", "signed 16 bit"
]
# unsigned 8 bit
u8 = array.array("B", [0] * length)
for i in range(length):
u8[i] = int(math.sin(math.pi * 2 * i / length) * (2**7) + 2**7)
samples.append(audiocore.RawSample(u8, sample_rate=4000))
# signed 8 bit
s8 = array.array("b", [0] * length)
for i in range(length):
s8[i] = int(math.sin(math.pi * 2 * i / length) * (2**7))
samples.append(audiocore.RawSample(s8, sample_rate=16000))
# unsigned 16 bit
u16 = array.array("H", [0] * length)
for i in range(length):
u16[i] = int(math.sin(math.pi * 2 * i / length) * (2**15) + 2**15)
samples.append(audiocore.RawSample(u16, sample_rate=8000))
import rp2pio
import adafruit_pioasm
time.sleep(10)
trigger = digitalio.DigitalInOut(board.D4)
trigger.switch_to_output(True)
# Generate one period of sine wav.
length = 8000 // 440
# signed 16 bit
s16 = array.array("h", [0] * length)
for i in range(length):
s16[i] = int(math.sin(math.pi * 2 * i / length) * (2**15))
print(s16[i])
sample = audiocore.RawSample(s16, sample_rate=8000)
dac = audiobusio.I2SOut(bit_clock=board.D10,
word_select=board.D11,
data=board.D12)
trigger.value = False
dac.play(sample, loop=True)
time.sleep(1)
dac.stop()
trigger.value = True
print("done")
import time
import array
import math
import audiocore
import board
import audiobusio
sample_rate = 8000
tone_volume = .1 # Increase or decrease this to adjust the volume of the tone.
frequency = 440 # Set this to the Hz of the tone you want to generate.
length = sample_rate // frequency # One freqency period
sine_wave = array.array("H", [0] * length)
for i in range(length):
sine_wave[i] = int(
(math.sin(math.pi * 2 * frequency * i / sample_rate) * tone_volume + 1)
* (2**15 - 1))
# For Feather M0 Express, ItsyBitsy M0 Express, Metro M0 Express
audio = audiobusio.I2SOut(board.D1, board.D0, board.D9)
# For Feather M4 Express
# audio = audiobusio.I2SOut(board.D1, board.D10, board.D11)
# For Metro M4 Express
# audio = audiobusio.I2SOut(board.D3, board.D9, board.D8)
sine_wave_sample = audiocore.RawSample(sine_wave, sample_rate=sample_rate)
while True:
audio.play(sine_wave_sample, loop=True)
time.sleep(1)
audio.stop()
time.sleep(1)