jim hamblen / Mbed 2 deprecated SPW2430_Microphone_Hello_World

Hello World for SPW2430 MEMs microphone. LEDs display audio level.

Dependencies:   mbed

main.cpp

Committer:
4180_1
Date:
2015-11-28
Revision:
0:1a0cc42c459d

File content as of revision 0:1a0cc42c459d:

#include "mbed.h"
//Adafruit MEMs SPW2430 microphone demo - LEDs display audio level
BusOut myleds(LED1,LED2,LED3,LED4);

class microphone
{
public :
    microphone(PinName pin);
    float read();
    operator float ();
private :
    AnalogIn _pin;
};
microphone::microphone (PinName pin):
    _pin(pin)
{
}
float microphone::read()
{
    return _pin.read();
}
inline microphone::operator float ()
{
    return _pin.read();
}

microphone mymicrophone(p16);

int main()
{
    while(1) {
//read in, subtract 0.67 DC bias, take absolute value, and scale up .1Vpp to 15 for builtin LED display
        myleds = int(abs((mymicrophone - (0.67/3.3)))*500.0);
//Use an 8kHz audio sample rate (phone quality audio);
        wait(1.0/8000.0);
    }
}