1# Author: John Van Drasek <john.r.van.drasek@intel.com>
2# Copyright (c) 2015 Intel Corporation.
3#
4# Permission is hereby granted, free of charge, to any person obtaining
5# a copy of this software and associated documentation files (the
6# "Software"), to deal in the Software without restriction, including
7# without limitation the rights to use, copy, modify, merge, publish,
8# distribute, sublicense, and/or sell copies of the Software, and to
9# permit persons to whom the Software is furnished to do so, subject to
10# the following conditions:
11#
12# The above copyright notice and this permission notice shall be
13# included in all copies or substantial portions of the Software.
14#
15# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22
23import time
24import pyupm_mic as upmMicrophone
25
26# Attach microphone to analog port A0
27myMic = upmMicrophone.Microphone(0)
28threshContext = upmMicrophone.thresholdContext()
29threshContext.averageReading = 0
30threshContext.runningAverage = 0
31threshContext.averagedOver = 2
32
33# Infinite loop, ends when script is cancelled
34# Repeatedly, take a sample every 2 microseconds;
35# find the average of 128 samples; and
36# print a running graph of dots as averages
37while(1):
38    buffer = upmMicrophone.uint16Array(128)
39    len = myMic.getSampledWindow(2, 128, buffer);
40    if len:
41        thresh = myMic.findThreshold(threshContext, 30, buffer, len)
42        myMic.printGraph(threshContext)
43        if(thresh):
44            print "Threshold is ", thresh
45
46# Delete the upmMicrophone object
47del myMic
48