Temp_demo.ino

// demo of Starter Kit V2.0 - Grove Temperature Sensor
//
#include <stdio.h>
const int pinTemp = A0;      // pin of temperature sensor

float temperature;
int B=3975;                  // B value of the thermistor
float resistance;
float tempF;
FILE *data;


void setup()
{
    Serial.begin(9600);
    data = fopen("home/root/tempdata.txt", "w");
}

void loop()
{
    data = fopen("/home/root/tempdata.txt", "a");  
    int val = analogRead(pinTemp);                               // get analog value
    resistance=(float)(1023-val)*10000/val;                      // get resistance
    temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;     // calc temperature
    Serial.println(temperature);
    tempF=((temperature*9.0)/5.0)+32.0;
//fprintf(data, "Fahrenheit");
    fprintf(data, "%f\n", tempF);
    
    delay(3000);          // delay 1s        
    fclose(data);
}