Kevin Abraham / Mbed 2 deprecated 4180Lab2-12

ECE 4180 Lab 2 Part 12

Dependencies:   mbed

Fork of SPW2430_Microphone_Hello_World by jim hamblen

main.cpp@1:fd1d5006df70, 2018-10-09 (annotated)

Committer:
abraha2d
Date:
Tue Oct 09 00:51:23 2018 +0000
Revision:
1:fd1d5006df70
Parent:
0:1a0cc42c459d 
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UserRevisionLine numberNew contents of line
4180_1 0:1a0cc42c459d 1 #include "mbed.h"
4180_1 0:1a0cc42c459d 2 //Adafruit MEMs SPW2430 microphone demo - LEDs display audio level
4180_1 0:1a0cc42c459d 3 BusOut myleds(LED1,LED2,LED3,LED4);
4180_1 0:1a0cc42c459d 4
4180_1 0:1a0cc42c459d 5 class microphone
4180_1 0:1a0cc42c459d 6 {
4180_1 0:1a0cc42c459d 7 public :
4180_1 0:1a0cc42c459d 8 microphone(PinName pin);
4180_1 0:1a0cc42c459d 9 float read();
4180_1 0:1a0cc42c459d 10 operator float ();
4180_1 0:1a0cc42c459d 11 private :
4180_1 0:1a0cc42c459d 12 AnalogIn _pin;
4180_1 0:1a0cc42c459d 13 };
4180_1 0:1a0cc42c459d 14 microphone::microphone (PinName pin):
4180_1 0:1a0cc42c459d 15 _pin(pin)
4180_1 0:1a0cc42c459d 16 {
4180_1 0:1a0cc42c459d 17 }
4180_1 0:1a0cc42c459d 18 float microphone::read()
4180_1 0:1a0cc42c459d 19 {
4180_1 0:1a0cc42c459d 20 return _pin.read();
4180_1 0:1a0cc42c459d 21 }
4180_1 0:1a0cc42c459d 22 inline microphone::operator float ()
4180_1 0:1a0cc42c459d 23 {
4180_1 0:1a0cc42c459d 24 return _pin.read();
4180_1 0:1a0cc42c459d 25 }
4180_1 0:1a0cc42c459d 26
4180_1 0:1a0cc42c459d 27 microphone mymicrophone(p16);
4180_1 0:1a0cc42c459d 28
4180_1 0:1a0cc42c459d 29 int main()
4180_1 0:1a0cc42c459d 30 {
4180_1 0:1a0cc42c459d 31 while(1) {
4180_1 0:1a0cc42c459d 32 //read in, subtract 0.67 DC bias, take absolute value, and scale up .1Vpp to 15 for builtin LED display
4180_1 0:1a0cc42c459d 33 myleds = int(abs((mymicrophone - (0.67/3.3)))*500.0);
4180_1 0:1a0cc42c459d 34 //Use an 8kHz audio sample rate (phone quality audio);
4180_1 0:1a0cc42c459d 35 wait(1.0/8000.0);
4180_1 0:1a0cc42c459d 36 }
4180_1 0:1a0cc42c459d 37 }