Thermistor Readings

Projects Programming
12

Yes for the thermistor on the Anderson page as I wrote in my last post..
in case you missed it.. http://www.phanderson.com/picaxe/lin_thermistor.html.
copied here...

// LIN_THERM - Arduino
//
// Continually measures temperature using linearized thermistor.
//
// copyright, Peter H Anderson, Oct 1, '10

unsigned int ad_meas(byte channel, byte num);
void display_temperature(int T);

void setup()
{
   Serial.begin(9600);
   delay(2000);
}

void loop()
{
    unsigned long Rtherm;
    unsigned int adval, R_therm, R_therm_10;
    int T_10;
    
    Serial.println("!!!!!!!!!!!!!!!!!!!!!!!!!");
    
    while(1)
    {
        adval = ad_meas(0, 32);
    
        R_therm = ((unsigned long) 2200) * adval / (1024 - adval); 
        
        if (R_therm > 3700)
        {
            T_10 = 9999;   // out of range
        }
        else if (R_therm > 1830)
        {
            T_10 = (R_therm * 10 - 37970) / -39;
        }
        else if (R_therm > 827)
        {
            T_10 = (R_therm * 10 - 33600) / -31;
        }
        else if (R_therm > 570)
        {
            T_10 = (R_therm * 10 - 22780) / -17;
        }
        else
        {
            T_10 = 9999;  // out of range
        }
        display_temperature(T_10);
        
        delay(5000);
    }        
}

unsigned int ad_meas(byte channel, byte num)
{
   unsigned int sum = 0, adval;
   byte n;
  
   for (n=0; n<num; n++)
   {
       adval = analogRead(channel);
       sum = sum + adval;
   }
   return(sum / num);
}

void display_temperature(int T)
{
    int whole, fract;
    
    whole = T / 10;  fract = T % 10;
    
    Serial.print(whole, DEC);
    Serial.print(".");
    Serial.println(fract, DEC);
}

Simple enough?