mbed Sensor node for Instrumented Booth over ETH.
Dependencies: EthernetInterface-1 MaxbotixDriver Presence HTU21D_TEMP_HUMID_SENSOR_SAMPLE Resources SHARPIR mbed-rtos mbed-src WDT_K64F nsdl_lib
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MAX9814.cpp
00001 /* 00002 MAX9814.cpp - MAX9814 sensor library 00003 Developed by Andrea Corrado 00004 */ 00005 00006 #include "mbed.h" 00007 #include "MAX9814.h" 00008 00009 MAX9814::MAX9814(PinName pin): _pin(pin) { //, _led1(LED1), _led2(LED2), _led3(LED3) { 00010 00011 } 00012 00013 00014 00015 float MAX9814::sound_level() { 00016 00017 _t.start(); 00018 float peakToPeak=0, signalMax=0, signalMin=1024; 00019 00020 while (_t.read_ms()<50) { 00021 _sample=_pin.read(); 00022 00023 if (_sample<1024) { 00024 if (_sample>signalMax) 00025 signalMax=_sample; 00026 00027 else if (_sample<signalMin) 00028 signalMin=_sample; 00029 } 00030 } 00031 _t.stop(); 00032 _t.reset(); 00033 peakToPeak=signalMax-signalMin; 00034 _value= (peakToPeak*3.3); 00035 _value = floor(_value * 100) / 100; 00036 00037 return _value; 00038 }
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