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Merge pull request #201 from dhalbert/pdmin_sample_rate

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add notes for PDMIn name change of frequency to sample_rate
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Kattni 2018-05-29 19:37:48 -04:00 committed by GitHub
commit d3c0ed3cc2
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2 changed files with 16 additions and 3 deletions
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9
CircuitPython_Made_Easy_On_CPX/cpx_sound_meter.py
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@ -19,8 +19,15 @@ def normalized_rms(values):
return math.sqrt(sum(float(sample - minbuf) *
(sample - minbuf) for sample in values) / len(values))
# For CircuitPython 2.x:
mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
frequency=16000, bit_depth=16)
# For Circuitpython 3.0 and up, "frequency" is now called "sample_rate".
# Comment the lines above and uncomment the lines below.
#mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
# sample_rate=16000, bit_depth=16)
mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA, frequency=16000, bit_depth=16)
samples = array.array('H', [0] * 160)
mic.record(samples, len(samples))
input_floor = normalized_rms(samples) + 10

10
Introducing_CircuitPlaygroundExpress/CircuitPlaygroundExpress_SoundMeter.py
View file

@ -88,8 +88,14 @@ pixels = neopixel.NeoPixel(board.NEOPIXEL, NUM_PIXELS,
pixels.fill(0)
pixels.show()
mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK,
board.MICROPHONE_DATA, frequency=16000, bit_depth=16)
# For CircuitPython 2.x:
mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
frequency=16000, bit_depth=16)
# For Circuitpython 3.0 and up, "frequency" is now called "sample_rate".
# Comment the lines above and uncomment the lines below.
#mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
# sample_rate=16000, bit_depth=16)
# Record an initial sample to calibrate. Assume it's quiet when we start.
samples = array.array('H', [0] * NUM_SAMPLES)
mic.record(samples, len(samples))