File content as of revision 0:83dfc83e48bf:

#include "mbed.h"

DigitalOut myled(LED1);
Serial pc(USBTX, USBRX);
AnalogIn tempPin(p15);

float tempTotal;
uint32_t tempDiv;

#define MAX_TEMP_AVG 10

void sampleTemperature();
void sampleTemperatures();
void resetTemperatureSamples();
float getAvgTemperature();

void sampleTemperature()
{
        tempTotal += tempPin; //we use 3.3V from VOUT
        tempDiv++;
}

void sampleTemperatures()
{
    for(int i=0;i<MAX_TEMP_AVG;i++) {
        sampleTemperature();
        wait(0.1);
    }
}

void resetTemperatureSamples()
{
    tempTotal = 0.0;
    tempDiv = 0;
}
float getAvgTemperature()
{
    /* Temperature calculations is (VOut - V0)/Tc 
    * VOut = V out from sensor
    * V0 = Voltage on 0 Celcius, 500mv for MCP9700
    * Tc = Temperatur constant, 10mV/C
    */
    float tempAvg = (((tempTotal*3300)/(float)tempDiv)-500.0)/10.0;
    return tempAvg;
}

int main() {
tempDiv = 0;
    pc.printf("MBED ready..\r\n");
    sampleTemperatures();
    pc.printf("Temp: %.2f.\r\n",getAvgTemperature());
    while(1) {
        sampleTemperature();
        
        myled = 1;
        wait(0.5);
        myled = 0;
        wait(0.5);
        
        if (tempDiv > MAX_TEMP_AVG) {
            pc.printf("Temp: %.2f.\r\n",getAvgTemperature());
            resetTemperatureSamples();
        }
    }
}