[Daox]

The other night I threw together a simple temperature data logger with my arduino. I was programming to make the differential controller for the attic fan heat dodad and figured it would be good to log some temperatures while I'm at it.

As the title says, its very simple to make. All you need is:
Arduino
LM35DZ-ND
some wire

The total cost for parts would be less than $40 and you could make a 6 channel logger out of it with a few more sensors and some additional code.


The code is also very simple:

/* quick temp data logger
*/

// Variable declaration
int temperature = 0;  // variable to keep the actual value 

// Analog pin declaration
int TsensorPin = 1;  // temperature sensor pin

void setup() 
{ 
  Serial.begin(9600);
  pinMode(TsensorPin, INPUT);
} 
void loop() 
{ 
  temperature = analogRead(TsensorPin) * .512;
  Serial.print(temperature);
  Serial.println(",");
  delay(300000);
}

Every 5 minutes the logger just spews the temperatures back to the arduino software on a computer, so you do need a laptop or desktop to connect to. Once you are done logging, you copy the text into notepad and save it as a .csv file which you can then import into excel and make a chart or what have you out of it.

Here is what I ended up with.




Now, there is a slight problem. The temperature does seem to be a bit off. However, I'm working on it.