Hi!
So, we try to control the speed (pwm) of a DC motor with a mic input using python 3 on a raspberry pi 2 model b. The code is running fine except this error that appears randomly.
The error occurs in line 36 (*inputMax = audioop.max(data,2)100/32768) where we make a %-value for the pwm control
This is the Code:
import alsaaudio, time, audioop
import RPi.GPIO as GPIO
#from RPIO import PWM
GPIO.setmode(GPIO.BOARD)
# Pulsewith
GPIO.setup(7,GPIO.OUT)
# Input H1
GPIO.setup(11,GPIO.OUT)
# Input H2
GPIO.setup(13,GPIO.OUT)
pwm = GPIO.PWM(7,100)
GPIO.output(7,GPIO.HIGH)
input = alsaaudio.PCM(alsaaudio.PCM_CAPTURE,alsaaudio.PCM_NONBLOCK)
input.setchannels(1)
input.setrate(8000)
input.setformat(alsaaudio.PCM_FORMAT_S16_LE)
input.setperiodsize(160)
GPIO.output(11,GPIO.LOW)
GPIO.output(13,GPIO.HIGH)
while True:
l,data = input.read()
if l:
inputMax = audioop.max(data,2)*100/32768
if inputMax <= 20:
print("zu leise")
pwm.start(0)
else:
print (audioop.max(data, 2))
pwm.start(inputMax)
time.sleep(.001)
#GPIO.cleanup()
any clues?
thank you 
I’m trying to get a simple microphone volume trigger going.
But I keep getting an error when I try to introduce ANY time delays beyond .001.
Can anyone figure this out?
The current code I’m using, based from other examples found around the net:
Code: Select all
#!/usr/bin/python
import alsaaudio, time, audioop
inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, 'Microphone')
# Set attributes: Mono, 8000 Hz, 16 bit little endian samples
inp.setchannels(1)
inp.setrate(8000)
inp.setformat(alsaaudio.PCM_FORMAT_S16_LE)
inp.setperiodsize(160)
x = 1
volMAX = 0
while True:
# Read data from device
l,data = inp.read()
if l:
# Return the maximum of the absolute value of all samples in a fragment.
volMAX = audioop.max(data, 2)
print volMAX
time.sleep(.001)
if volMAX > 149:
print("Limit reached.")
#time.sleep(5)
This code will run fine, until I try to stop and do something else after the limit is reached. For example uncommenting time.sleep(5)
Then I get this error:
volMAX = audioop.max(data, 2)
audioop.error: not a whole number of frames
I want to do other things (pause, light a LED, etc) for a while when the limit is reached, and then go back to watching the microphone for the next trigger event.
Thank you for any help : )
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jiaaro / pydub / pydub / pyaudioop.py View on Github 
def findfit(cp1, cp2):
size = 2
if len(cp1) % 2 != 0 or len(cp2) % 2 != 0:
raise error("Strings should be even-sized")
if len(cp1) < len(cp2):
raise error("First sample should be longer")
len1 = _sample_count(cp1, size)
len2 = _sample_count(cp2, size)
sum_ri_2 = _sum2(cp2, cp2, len2)
sum_aij_2 = _sum2(cp1, cp1, len2)
sum_aij_ri = _sum2(cp1, cp2, len2)
result = (sum_ri_2 * sum_aij_2 - sum_aij_ri * sum_aij_ri) / sum_aij_2
best_result = result
best_i = 0
for i in range(1, len1 - len2 + 1):
aj_m1 = _get_sample(cp1, size, i - 1)
aj_lm1 = _get_sample(cp1, size, i + len2 - 1)def ratecv(cp, size, nchannels, inrate, outrate, state, weightA=1, weightB=0):
_check_params(len(cp), size)
if nchannels < 1:
raise error("# of channels should be >= 1")
bytes_per_frame = size * nchannels
frame_count = len(cp) / bytes_per_frame
if bytes_per_frame / nchannels != size:
raise OverflowError("width * nchannels too big for a C int")
if weightA < 1 or weightB < 0:
raise error("weightA should be >= 1, weightB should be >= 0")
if len(cp) % bytes_per_frame != 0:
raise error("not a whole number of frames")
if inrate <= 0 or outrate <= 0:
raise error("sampling rate not > 0")
d = gcd(inrate, outrate)
inrate /= d
outrate /= d
prev_i = [0] * nchannels
cur_i = [0] * nchannels
if state is None:
d = -outrate
else:
d, samps = statedef ratecv(cp, size, nchannels, inrate, outrate, state, weightA=1, weightB=0):
_check_params(len(cp), size)
if nchannels < 1:
raise error("# of channels should be >= 1")
bytes_per_frame = size * nchannels
frame_count = len(cp) / bytes_per_frame
if bytes_per_frame / nchannels != size:
raise OverflowError("width * nchannels too big for a C int")
if weightA < 1 or weightB < 0:
raise error("weightA should be >= 1, weightB should be >= 0")
if len(cp) % bytes_per_frame != 0:
raise error("not a whole number of frames")
if inrate <= 0 or outrate <= 0:
raise error("sampling rate not > 0")
d = gcd(inrate, outrate)
inrate /= d
outrate /= d
prev_i = [0] * nchannels
cur_i = [0] * nchannels
if state is None:
d = -outrate