ADC Library

ADC General Purpose Library

Author: BasicAirData

Software/Arduino/Libraries/ADC/AirDC.cpp

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+/*
+  AirDC.cpp - Library for Basic Air Data calculations
+  Created by J. Larragueta, December 3, 2015.
+  Refer to http:\\www.basicairdata.eu
+*/
+#include "AirDC.h"
+#include <math.h>
+
+AirDC::AirDC(int pid)
+{
+    //pinMode(pin, OUTPUT);
+    _pid = pid;
+}
+//Rho(Pressure,Temperature,Relative Humidity)
+//http://www.basicairdata.eu/calculation-routines.html
+double AirDC::Rho(double p, double T,double RH)
+{
+//Some definition
+    const double R= 8.314510;//J/(mol°K)
+    const double xco2=0.0004;//Co2 fraction
+    const double A=1.2378847e-5;
+    const double B=-1.9121316e-2;
+    const double C=33.93711047;
+    const double D=-6.3431645e3;
+    const double alfa=1.00062;
+    const double bet=3.14e-8;
+    const double gama=5.6e-7;
+    const double a0=1.58123e-6;
+    const double a1=-2.9331e-8;
+    const double a2=1.1043e-10;
+    const double b0=5.707e-6;
+    const double b1=-2.051e-8;
+    const double c0=1.9898e-4;
+    const double c1=-2.376e-6;
+    const double d=1.83e-11;
+    const double e=- 0.765e-8;
+    const double Ma=28.9635 + 12.011*(xco2- 0.0004);
+    const double Mv=18.01528;
+    double psv,t,f,xv,Z,rho,h;
+    h=RH;
+    psv=1*exp(A*pow(T,2)+B*T+C+D/T);
+    t=T-273.15;
+    f=alfa+bet*p+gama*pow(t,2);
+    xv=h*f*psv/p;
+    Z=1-p/T*(a0+a1*t+a2*pow(t,2)+(b0+b1*t)*xv+(c0+c1*t)*pow(xv,2))+pow(p,2)/pow(T,2)*(d+e*pow(xv,2));
+    rho=p*Ma/(Z*R*T)*(1-xv*(1-Mv/Ma))*0.001;
+    //Class Variables undate and Output
+    return rho;
+}

Software/Arduino/Libraries/ADC/AirDC.h

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+/*
+  AirDC.cpp - Library for Basic Air Data calculations
+  Created by J. Larragueta, December 3, 2015.
+  Refer to http:\\www.basicairdata.eu
+*/
+
+#ifndef AirDC_h
+#define AirDC_h
+#include "Arduino.h"
+class AirDC
+{
+  public:
+    AirDC(int pid);
+    double Rho(double T, double p,double RH);
+  private:
+    int _pid;
+    double _p;
+    double _t;
+    double _RH;
+};
+#endif
+

Software/Arduino/Libraries/ADC/keywords.txt

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+AirDC	KEYWORD1
+Rho	KEYWORD2