File content as of revision 6:9de0807e2855:

#include "mbed.h"
#include <cmath>
//#include <LinearTemp.h>

Serial pc(USBTX, USBRX);
DigitalOut myled1(LED1), myled2(LED2);
AnalogIn pin_1(p16), pin_2(p15), pin_3(p17) ;
AnalogOut pin_18 (p18);
//LinearTemp mysensor(p15, 0.0050354, -273.15); 
 
char program_name[128] = "G3-Waterplay Project";

void salinityMeasurement();
void temperatureMeasurement();

int main()
{
     while(1){
        wait(2); 
        salinityMeasurement();
        temperatureMeasurement();
    }
}
    
//salinity function
void salinityMeasurement(){
    float f = pin_1.read();

    float vin = f * 3.3;
    float divider = (float)5/ (float)3;
    float vout = vin * divider;
    
    //measure the salinity
    float salt = 16.3 * vout; 
    pc.printf("vin: %f, vout: %f, salt: %f \n\r", vin, vout, salt);
}

//temperature function
void temperatureMeasurement(){
    //measure the temperature
    double f2 = pin_2.read();
    double vin = f2 * 4.85;
    double divider = (double)5/ (double)3;
    double vout = vin * divider;
    
    double RT = (vout * (double)15000) / (4.85 - vout);
    double K0 = 0.00102119;
    double K1 = 0.000222468 * (log(RT));
    double K2 = double (1.33342 * pow (10.0, -7.0)) * pow ((double)log(RT), 3.0);
    double TKelvin = 1.0 / (K0 + K1 + K2);
    double Celcius = (TKelvin - 273.15)+5.0;
    
    //pc.printf("K0: %f, K1: %f, K2: %f \n\r", K0, K1, K2); 
    //pc.printf("vin: %f, vout: %f, temperature: %f \n\r", vin, vout, Celcius);
    pc.printf("vin: %f, vout: %f, temperature: %f \n\r",vin, vout, Celcius);
    
    if (Celcius < 26){
        pin_18 = 1;
        myled1 = 1;
    }else{
        pin_18 = 0;  
        myled1 = 0;      
    }
}