Program 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.
Dependencies: MAX9814_Electret_Microphone_LED_Volume_Indicator mbed
Diff: main.cpp
- Revision:
- 1:380e6ab41172
- Parent:
- 0:d096ca2ffef0
- Child:
- 2:204df97fe23a
diff -r d096ca2ffef0 -r 380e6ab41172 main.cpp
--- a/main.cpp Sun Nov 02 17:00:16 2014 +0000
+++ b/main.cpp Sun Nov 02 17:12:22 2014 +0000
@@ -1,136 +1,14 @@
#include "mbed.h"
-//#include "Hammer_MicrophoneSensor.h"
+#include "Hammer_MicrophoneSensor.h"
Serial pc (USBTX, USBRX);
-
-
-class MAX9814 {
-
-public:
-
- MAX9814(PinName pin): _pin(pin), _led1(LED1), _led2(LED2), _led3(LED3), _led4(LED4) {
- }
-
-
-void led_array(float x ) {
-
- if (_value<x+0.05) {
- _led1=0;
- _led2=0;
- _led3=0;
- _led4=0;
- }
- if (_value>x+0.05&&_value<0.5+x) {
- _led1=1;
- _led2=0;
- _led3=0;
- _led4=0;
- }
- if (_value>0.5+x&&_value<1+x) {
- _led1=1;
- _led2=1;
- _led3=0;
- _led4=0;
- }
- if (_value>1+x&&_value<1.2+x) {
- _led1=1;
- _led2=1;
- _led3=1;
- _led4=0;
- }
- if (_value>1.2+x&&_value<2.8+x) {
- _led1=1;
- _led2=1;
- _led3=1;
- _led4=1;
- }
-}
-
-float calibration() {
-
- _t.start();
- _t1.start();
- float peakToPeak=0, signalMax=0, signalMin=1024;
-
- while (_t1.read()<1) {
- while (_t.read_ms()<50) {
- _sample=_pin.read();
-
- if (_sample<1024) {
- if (_sample>signalMax)
- signalMax=_sample;
-
- else if (_sample<signalMin)
- signalMin=_sample;
- }
- }
- _t.reset();
- peakToPeak=signalMax-signalMin;
- _value= (peakToPeak*3.3);
- _value = floor(_value * 100) / 100;
- _sum+=_value;
- _count++;
- }
- _average=_sum/_count;
- _t1.reset();
-
- return _average;
-}
-
-float sound_level() {
-
- _t.start();
- float peakToPeak=0, signalMax=0, signalMin=1024;
-
- while (_t.read_ms()<50) {
- _sample=_pin.read();
-
- if (_sample<1024) {
- if (_sample>signalMax)
- signalMax=_sample;
-
- else if (_sample<signalMin)
- signalMin=_sample;
- }
- }
- _t.reset();
- peakToPeak=signalMax-signalMin;
- _value= (peakToPeak*3.3);
- _value = floor(_value * 100) / 100;
- _sum+=_value;
- _count++;
-
- return _value;
-}
-
-
-void volume_indicator() {
- led_array(_average);
- sound_level();
-}
-
-protected:
- AnalogIn _pin;
- BusOut _led1, _led2, _led3, _led4;
- float _value,_sum,_average;
- int _count;
- float _sample;
- Timer _t,_t1;
-
-};
-
-
-
-
MAX9814 mic(p20);
int main()
{
- mic.calibration();
while (1) {
mic.volume_indicator();
- mic.sound_level();
pc.printf("\n\r Level is %f", mic.sound_level());
}
}
\ No newline at end of file
Andrea Corrado
Electret Microphone Amplifier - MAX9814