Published September 24, 2016 © MIT

LM35 Temperature Sensor Caliberation and Monitoring

This project help you understand how to calibrate analog sensor values to standard units.

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LM35 Temperature Sensor Caliberation and Monitoring

Things used in this project

Hardware components

Temperature Sensor

SparkFun FTDI Basic Breakout - 5V

Microchip ATtiny85

ATtiny 44

Story

I used Two Point Caliberation Method using an Ice-Water bath and Boiling Water for the two referances this is a linear temperature sensor thats why it will give good result in this method.

We know water boils at 100 Degree Celcius and Triple Point is 0.01 Degree Celcius:

Reference Low = 0.01 Degree Celcius

Reference High =100 Degree Celcius

My Readings

Raw Low = 848

Raw High = 868

Raw Range = 20

Put these values in Two Point Calibration Equation:

CorrectedValue = (((RawValue – RawLow) * ReferenceRange) / RawRange) + ReferenceLow

Detailed Video of the Process:

Schematics

Code

Arduino Code - for ATtiny44

/* Reading Data from LM35 Temperature Sensor
Muhammed Jaseel P
Fablab Trivandrum
*/
#include <SoftwareSerial.h>
   #define Rx 4
   #define Tx 3
   SoftwareSerial ftdi(Rx,Tx);
   void setup() {
   ftdi.begin(9600);
  }
   void loop()
  {
    if(ftdi.available() ){
    ftdi.println("Temperature in Degree Celcious");
    int RawValue  = analogRead(A1);//Raw Data from Sensor
    int CorrectedValue=((RawValue-848)*4.995)+0.01; // Caliberated Result
    ftdi.println(CorrectedValue);
    delay(2000);
    }
    }

Credits

Muhammed Jaseel

4 projects • 20 followers

I am a Maker and Developer

LM35 Temperature Sensor Caliberation and Monitoring

Things used in this project

Hardware components

Story

My Readings

Detailed Video of the Process:

Custom parts and enclosures

Main Board - Sch

Sensor Board

Schematics

Eagle

Code

Arduino Code - for ATtiny44

Credits

Muhammed Jaseel

Comments

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LM35 Temperature Sensor Caliberation and Monitoring

LM35 Temperature Sensor Caliberation and Monitoring

Things used in this project

Hardware components

Story

My Readings

Detailed Video of the Process:

Custom parts and enclosures

Main Board - Sch

Sensor Board

Schematics

Eagle

Code

Arduino Code - for ATtiny44

Credits

Muhammed Jaseel

Comments

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