main.cpp

00001 #include "mbed.h"
00002 //Adafruit MEMs SPW2430 microphone demo - LEDs display audio level
00003 BusOut myleds(LED1,LED2,LED3,LED4);
00004 
00005 class microphone
00006 {
00007 public :
00008     microphone(PinName pin);
00009     float read();
00010     operator float ();
00011 private :
00012     AnalogIn _pin;
00013 };
00014 microphone::microphone (PinName pin):
00015     _pin(pin)
00016 {
00017 }
00018 float microphone::read()
00019 {
00020     return _pin.read();
00021 }
00022 inline microphone::operator float ()
00023 {
00024     return _pin.read();
00025 }
00026 
00027 microphone mymicrophone(p16);
00028 
00029 int main()
00030 {
00031     while(1) {
00032 //read in, subtract 0.67 DC bias, take absolute value, and scale up .1Vpp to 15 for builtin LED display
00033         myleds = int(abs((mymicrophone - (0.67/3.3)))*500.0);
00034 //Use an 8kHz audio sample rate (phone quality audio);
00035         wait(1.0/8000.0);
00036     }
00037 }