Andrea Corrado / MAX9814_Electret_Microphone_LED_Volume_Indicator

Library to control Electret Microphone Amplifier - MAX9814 from adafruit. Allows: To sample analogue voltage to transform into rough sound level. Transfer sound level to visual indicator, volume bar such as 4 LEDs on LPC11U24.

Dependents:   MAX9814_LED_Sound_Indicator

MAX9814.cpp@0:49d2ee7cb020, 2014-11-02 (annotated)

Committer:
andcor02
Date:
Sun Nov 02 17:32:03 2014 +0000
Revision:
0:49d2ee7cb020
Child:
1:cf181e6a2ead
Library to control Electret Microphone Amplifier - MAX9814 from adafruit.; ; Allows:; ; To sample analogue voltage to transform into rough sound level.; ; Transfer sound level to visual indicator, volume bar such as 4 LEDs on LPC11U24.; ; ;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andcor02 0:49d2ee7cb020 1 #include "mbed.h"
andcor02 0:49d2ee7cb020 2 #include "MAX9814.h"
andcor02 0:49d2ee7cb020 3
andcor02 0:49d2ee7cb020 4 MAX9814::MAX9814(PinName pin): _pin(pin), _led1(LED1), _led2(LED2), _led3(LED3), _led4(LED4) {
andcor02 0:49d2ee7cb020 5 calibration();
andcor02 0:49d2ee7cb020 6 }
andcor02 0:49d2ee7cb020 7
andcor02 0:49d2ee7cb020 8
andcor02 0:49d2ee7cb020 9 void MAX9814::led_array(float x ) {
andcor02 0:49d2ee7cb020 10
andcor02 0:49d2ee7cb020 11 if (_value<x+0.05) {
andcor02 0:49d2ee7cb020 12 _led1=0;
andcor02 0:49d2ee7cb020 13 _led2=0;
andcor02 0:49d2ee7cb020 14 _led3=0;
andcor02 0:49d2ee7cb020 15 _led4=0;
andcor02 0:49d2ee7cb020 16 }
andcor02 0:49d2ee7cb020 17 if (_value>x+0.05&&_value<0.5+x) {
andcor02 0:49d2ee7cb020 18 _led1=1;
andcor02 0:49d2ee7cb020 19 _led2=0;
andcor02 0:49d2ee7cb020 20 _led3=0;
andcor02 0:49d2ee7cb020 21 _led4=0;
andcor02 0:49d2ee7cb020 22 }
andcor02 0:49d2ee7cb020 23 if (_value>0.5+x&&_value<1+x) {
andcor02 0:49d2ee7cb020 24 _led1=1;
andcor02 0:49d2ee7cb020 25 _led2=1;
andcor02 0:49d2ee7cb020 26 _led3=0;
andcor02 0:49d2ee7cb020 27 _led4=0;
andcor02 0:49d2ee7cb020 28 }
andcor02 0:49d2ee7cb020 29 if (_value>1+x&&_value<1.2+x) {
andcor02 0:49d2ee7cb020 30 _led1=1;
andcor02 0:49d2ee7cb020 31 _led2=1;
andcor02 0:49d2ee7cb020 32 _led3=1;
andcor02 0:49d2ee7cb020 33 _led4=0;
andcor02 0:49d2ee7cb020 34 }
andcor02 0:49d2ee7cb020 35 if (_value>1.2+x&&_value<2.8+x) {
andcor02 0:49d2ee7cb020 36 _led1=1;
andcor02 0:49d2ee7cb020 37 _led2=1;
andcor02 0:49d2ee7cb020 38 _led3=1;
andcor02 0:49d2ee7cb020 39 _led4=1;
andcor02 0:49d2ee7cb020 40 }
andcor02 0:49d2ee7cb020 41 }
andcor02 0:49d2ee7cb020 42
andcor02 0:49d2ee7cb020 43 float MAX9814::calibration() {
andcor02 0:49d2ee7cb020 44
andcor02 0:49d2ee7cb020 45 _t.start();
andcor02 0:49d2ee7cb020 46 _t1.start();
andcor02 0:49d2ee7cb020 47 float peakToPeak=0, signalMax=0, signalMin=1024;
andcor02 0:49d2ee7cb020 48
andcor02 0:49d2ee7cb020 49 while (_t1.read()<1) {
andcor02 0:49d2ee7cb020 50 while (_t.read_ms()<50) {
andcor02 0:49d2ee7cb020 51 _sample=_pin.read();
andcor02 0:49d2ee7cb020 52
andcor02 0:49d2ee7cb020 53 if (_sample<1024) {
andcor02 0:49d2ee7cb020 54 if (_sample>signalMax)
andcor02 0:49d2ee7cb020 55 signalMax=_sample;
andcor02 0:49d2ee7cb020 56
andcor02 0:49d2ee7cb020 57 else if (_sample<signalMin)
andcor02 0:49d2ee7cb020 58 signalMin=_sample;
andcor02 0:49d2ee7cb020 59 }
andcor02 0:49d2ee7cb020 60 }
andcor02 0:49d2ee7cb020 61 _t.reset();
andcor02 0:49d2ee7cb020 62 peakToPeak=signalMax-signalMin;
andcor02 0:49d2ee7cb020 63 _value= (peakToPeak*3.3);
andcor02 0:49d2ee7cb020 64 _value = floor(_value * 100) / 100;
andcor02 0:49d2ee7cb020 65 _sum+=_value;
andcor02 0:49d2ee7cb020 66 _count++;
andcor02 0:49d2ee7cb020 67 }
andcor02 0:49d2ee7cb020 68 _average=_sum/_count;
andcor02 0:49d2ee7cb020 69 _t1.reset();
andcor02 0:49d2ee7cb020 70
andcor02 0:49d2ee7cb020 71 return _average;
andcor02 0:49d2ee7cb020 72 }
andcor02 0:49d2ee7cb020 73
andcor02 0:49d2ee7cb020 74 float MAX9814::sound_level() {
andcor02 0:49d2ee7cb020 75
andcor02 0:49d2ee7cb020 76 _t.start();
andcor02 0:49d2ee7cb020 77 float peakToPeak=0, signalMax=0, signalMin=1024;
andcor02 0:49d2ee7cb020 78
andcor02 0:49d2ee7cb020 79 while (_t.read_ms()<50) {
andcor02 0:49d2ee7cb020 80 _sample=_pin.read();
andcor02 0:49d2ee7cb020 81
andcor02 0:49d2ee7cb020 82 if (_sample<1024) {
andcor02 0:49d2ee7cb020 83 if (_sample>signalMax)
andcor02 0:49d2ee7cb020 84 signalMax=_sample;
andcor02 0:49d2ee7cb020 85
andcor02 0:49d2ee7cb020 86 else if (_sample<signalMin)
andcor02 0:49d2ee7cb020 87 signalMin=_sample;
andcor02 0:49d2ee7cb020 88 }
andcor02 0:49d2ee7cb020 89 }
andcor02 0:49d2ee7cb020 90 _t.reset();
andcor02 0:49d2ee7cb020 91 peakToPeak=signalMax-signalMin;
andcor02 0:49d2ee7cb020 92 _value= (peakToPeak*3.3);
andcor02 0:49d2ee7cb020 93 _value = floor(_value * 100) / 100;
andcor02 0:49d2ee7cb020 94 _sum+=_value;
andcor02 0:49d2ee7cb020 95 _count++;
andcor02 0:49d2ee7cb020 96
andcor02 0:49d2ee7cb020 97 return _value;
andcor02 0:49d2ee7cb020 98 }
andcor02 0:49d2ee7cb020 99
andcor02 0:49d2ee7cb020 100
andcor02 0:49d2ee7cb020 101 void MAX9814::volume_indicator() {
andcor02 0:49d2ee7cb020 102 led_array(_average);
andcor02 0:49d2ee7cb020 103 sound_level();
andcor02 0:49d2ee7cb020 104 }