Clap Detector

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1/*
2
3 This example reads audio data from an Invensense's ICS43432 I2S microphone
4
5 breakout board, and uses the input to detect clapping sounds. An LED is
6
7 toggled when a clap is detected.
8
9 Circuit:
10
11 * Arduino Zero, MKRZero or MKR1000 board
12
13 * ICS43432:
14
15   * GND connected GND
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17   * 3.3V connected 3.3V (Zero) or VCC (MKR1000, MKRZero)
18
19   * WS connected to pin 0 (Zero) or pin 3 (MKR1000, MKRZero)
20
21   * CLK connected to pin 1 (Zero) or pin 2 (MKR1000, MKRZero)
22
23   * SD connected to pin 9 (Zero) or pin A6 (MKR1000, MKRZero)
24
25 created 18 November 2016
26
27 by Sandeep Mistry
28
29 */
30
31#include <ArduinoSound.h>
32
33// the LED pin to use as output
34
35const int ledPin = LED_BUILTIN;
36
37// the amplitude threshold for a clap to be detected
38
39const int amplitudeDeltaThreshold = 100000000;
40
41// create an amplitude analyzer to be used with the I2S input
42
43AmplitudeAnalyzer amplitudeAnalyzer;
44
45// variable to keep track of last amplitude
46int lastAmplitude = 0;
47
48void setup() {
49
50  // setup the serial
51
52  Serial.begin(9600);
53
54  // configure the LED pin as an output
55
56  pinMode(ledPin, OUTPUT);
57
58  // setup the I2S audio input for 44.1 kHz with 32-bits per sample
59
60  if (!AudioInI2S.begin(44100, 32)) {
61
62    Serial.println("Failed to initialize I2S input!");
63
64    while (1); // do nothing
65
66  }
67
68  // configure the I2S input as the input for the amplitude analyzer
69
70  if (!amplitudeAnalyzer.input(AudioInI2S)) {
71
72    Serial.println("Failed to set amplitude analyzer input!");
73
74    while (1); // do nothing
75
76  }
77}
78
79void loop() {
80
81  // check if a new analysis is available
82
83  if (amplitudeAnalyzer.available()) {
84
85    // read the new amplitude
86
87    int amplitude = amplitudeAnalyzer.read();
88
89    // find the difference between the new amplitude and the last
90
91    int delta = amplitude - lastAmplitude;
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93
94
95    // check if the difference is larger than the threshold
96
97    if (delta > amplitudeDeltaThreshold) {
98
99      // a clap was detected
100
101      Serial.println("clap detected");
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103
104
105      // toggle the LED
106
107      digitalWrite(ledPin, !digitalRead(ledPin));
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109
110
111      // delay a bit to debounce
112
113      delay(100);
114
115    }
116
117
118
119    // update the last amplitude with the new amplitude
120
121    lastAmplitude = amplitude;
122
123  }
124}