This library sets up and LED volume indication function and reading values from the Electret Microphone - MAX4466 Amplifier
Dependents: MAX4466_Hello_World
MAX4466.cpp@0:712373b300a2, 2015-10-23 (annotated)
- Committer:
- mgolino
- Date:
- Fri Oct 23 18:37:33 2015 +0000
- Revision:
- 0:712373b300a2
- Child:
- 1:76c72cf9ae2b
Hello World for MAX4466
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mgolino | 0:712373b300a2 | 1 | #include "mbed.h" |
mgolino | 0:712373b300a2 | 2 | #include "MAX4466.h" |
mgolino | 0:712373b300a2 | 3 | |
mgolino | 0:712373b300a2 | 4 | MAX4466::MAX4466(PinName pin): _pin(pin), _led1(LED1), _led2(LED2), _led3(LED3), _led4(LED4) { |
mgolino | 0:712373b300a2 | 5 | calibration(); |
mgolino | 0:712373b300a2 | 6 | } |
mgolino | 0:712373b300a2 | 7 | |
mgolino | 0:712373b300a2 | 8 | //CALIBRATION FUNCTION: |
mgolino | 0:712373b300a2 | 9 | //Find average sound level at the intialization of the microphone |
mgolino | 0:712373b300a2 | 10 | //Use this in the calculation of the LED indication array values |
mgolino | 0:712373b300a2 | 11 | float MAX4466::calibration() { |
mgolino | 0:712373b300a2 | 12 | |
mgolino | 0:712373b300a2 | 13 | _t.start(); |
mgolino | 0:712373b300a2 | 14 | _t1.start(); |
mgolino | 0:712373b300a2 | 15 | float peakToPeak=0, signalMax=0, signalMin=1024; |
mgolino | 0:712373b300a2 | 16 | |
mgolino | 0:712373b300a2 | 17 | while (_t1.read()<1) { |
mgolino | 0:712373b300a2 | 18 | while (_t.read_ms()<50) { |
mgolino | 0:712373b300a2 | 19 | _sample=_pin.read(); |
mgolino | 0:712373b300a2 | 20 | |
mgolino | 0:712373b300a2 | 21 | if (_sample<1024) { |
mgolino | 0:712373b300a2 | 22 | if (_sample>signalMax) |
mgolino | 0:712373b300a2 | 23 | signalMax=_sample; |
mgolino | 0:712373b300a2 | 24 | |
mgolino | 0:712373b300a2 | 25 | else if (_sample<signalMin) |
mgolino | 0:712373b300a2 | 26 | signalMin=_sample; |
mgolino | 0:712373b300a2 | 27 | } |
mgolino | 0:712373b300a2 | 28 | } |
mgolino | 0:712373b300a2 | 29 | _t.reset(); |
mgolino | 0:712373b300a2 | 30 | peakToPeak=signalMax-signalMin; |
mgolino | 0:712373b300a2 | 31 | _value= (peakToPeak*3.3); |
mgolino | 0:712373b300a2 | 32 | _value = floor(_value * 100) / 100; |
mgolino | 0:712373b300a2 | 33 | _sum+=_value; |
mgolino | 0:712373b300a2 | 34 | _count++; |
mgolino | 0:712373b300a2 | 35 | } |
mgolino | 0:712373b300a2 | 36 | _average=_sum/_count; |
mgolino | 0:712373b300a2 | 37 | _t1.reset(); |
mgolino | 0:712373b300a2 | 38 | |
mgolino | 0:712373b300a2 | 39 | return _average; |
mgolino | 0:712373b300a2 | 40 | } |
mgolino | 0:712373b300a2 | 41 | |
mgolino | 0:712373b300a2 | 42 | //LED ARRAY FUNCTION: |
mgolino | 0:712373b300a2 | 43 | //Setup array of 4 LEDs based on the current value read by the microphone |
mgolino | 0:712373b300a2 | 44 | //And the average value found during calibration |
mgolino | 0:712373b300a2 | 45 | void MAX4466::led_array(float x ) { |
mgolino | 0:712373b300a2 | 46 | |
mgolino | 0:712373b300a2 | 47 | if (_value<x+0.05) { |
mgolino | 0:712373b300a2 | 48 | _led1=0; |
mgolino | 0:712373b300a2 | 49 | _led2=0; |
mgolino | 0:712373b300a2 | 50 | _led3=0; |
mgolino | 0:712373b300a2 | 51 | _led4=0; |
mgolino | 0:712373b300a2 | 52 | } |
mgolino | 0:712373b300a2 | 53 | if (_value>x+0.05&&_value<0.5+x) { |
mgolino | 0:712373b300a2 | 54 | _led1=1; |
mgolino | 0:712373b300a2 | 55 | _led2=0; |
mgolino | 0:712373b300a2 | 56 | _led3=0; |
mgolino | 0:712373b300a2 | 57 | _led4=0; |
mgolino | 0:712373b300a2 | 58 | } |
mgolino | 0:712373b300a2 | 59 | if (_value>0.5+x&&_value<1+x) { |
mgolino | 0:712373b300a2 | 60 | _led1=1; |
mgolino | 0:712373b300a2 | 61 | _led2=1; |
mgolino | 0:712373b300a2 | 62 | _led3=0; |
mgolino | 0:712373b300a2 | 63 | _led4=0; |
mgolino | 0:712373b300a2 | 64 | } |
mgolino | 0:712373b300a2 | 65 | if (_value>1+x&&_value<1.2+x) { |
mgolino | 0:712373b300a2 | 66 | _led1=1; |
mgolino | 0:712373b300a2 | 67 | _led2=1; |
mgolino | 0:712373b300a2 | 68 | _led3=1; |
mgolino | 0:712373b300a2 | 69 | _led4=0; |
mgolino | 0:712373b300a2 | 70 | } |
mgolino | 0:712373b300a2 | 71 | if (_value>1.2+x&&_value<2.8+x) { |
mgolino | 0:712373b300a2 | 72 | _led1=1; |
mgolino | 0:712373b300a2 | 73 | _led2=1; |
mgolino | 0:712373b300a2 | 74 | _led3=1; |
mgolino | 0:712373b300a2 | 75 | _led4=1; |
mgolino | 0:712373b300a2 | 76 | } |
mgolino | 0:712373b300a2 | 77 | } |
mgolino | 0:712373b300a2 | 78 | |
mgolino | 0:712373b300a2 | 79 | //SOUND LEVEL FUNCTIOM: |
mgolino | 0:712373b300a2 | 80 | //Read in current sound level |
mgolino | 0:712373b300a2 | 81 | float MAX4466::sound_level() { |
mgolino | 0:712373b300a2 | 82 | |
mgolino | 0:712373b300a2 | 83 | _t.start(); |
mgolino | 0:712373b300a2 | 84 | float peakToPeak=0, signalMax=0, signalMin=1024; |
mgolino | 0:712373b300a2 | 85 | |
mgolino | 0:712373b300a2 | 86 | while (_t.read_ms()<50) { |
mgolino | 0:712373b300a2 | 87 | _sample=_pin.read(); |
mgolino | 0:712373b300a2 | 88 | |
mgolino | 0:712373b300a2 | 89 | if (_sample<1024) { |
mgolino | 0:712373b300a2 | 90 | if (_sample>signalMax) |
mgolino | 0:712373b300a2 | 91 | signalMax=_sample; |
mgolino | 0:712373b300a2 | 92 | |
mgolino | 0:712373b300a2 | 93 | else if (_sample<signalMin) |
mgolino | 0:712373b300a2 | 94 | signalMin=_sample; |
mgolino | 0:712373b300a2 | 95 | } |
mgolino | 0:712373b300a2 | 96 | } |
mgolino | 0:712373b300a2 | 97 | _t.reset(); |
mgolino | 0:712373b300a2 | 98 | peakToPeak=signalMax-signalMin; |
mgolino | 0:712373b300a2 | 99 | _value= (peakToPeak*3.3); |
mgolino | 0:712373b300a2 | 100 | _value = floor(_value * 100) / 100; |
mgolino | 0:712373b300a2 | 101 | _sum+=_value; |
mgolino | 0:712373b300a2 | 102 | _count++; |
mgolino | 0:712373b300a2 | 103 | |
mgolino | 0:712373b300a2 | 104 | return _value; |
mgolino | 0:712373b300a2 | 105 | } |
mgolino | 0:712373b300a2 | 106 | |
mgolino | 0:712373b300a2 | 107 | //VOLUME INDICATOR FUNCTION: |
mgolino | 0:712373b300a2 | 108 | //To be called in main function |
mgolino | 0:712373b300a2 | 109 | void MAX4466::volume_indicator() { |
mgolino | 0:712373b300a2 | 110 | led_array(_average); |
mgolino | 0:712373b300a2 | 111 | sound_level(); |
mgolino | 0:712373b300a2 | 112 | } |