How to use LM35 To Measure Temperature in Celsius Fahrenheit and Kelvin

This video shows how to use LM35 Temperature Sensor to measure temperature using Arduino. We will display temperature in Celsius, Fahrenheit and Kelvin.

 
/*
 * This Arduin sketch is to use LM35 to measure temperature
 * This code has two way to get temperature
 * 1-To print the temperatuere either in C, F or K on the serial monitor
 * 2-To return the value in C, F and K
 * 
 * Watch Video instrution for this code:https://youtu.be/S5IBc_epa1A
 * 
 * Full explanation of this code and wiring diagram is available at
 * my Arduino Course at Udemy.com here: http://robojax.com/L/?id=62

 * Written by Ahmad Shamshiri on May 08, 2020 at 02:45 in Ajax, Ontario, Canada
 * in Ajax, Ontario, Canada. www.robojax.com
 * 

 * Get this code and other Arduino codes from Robojax.com
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 *  * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.


*/

const int inPin =A0;//can change
const int iteration = 1000; //can change (see video)
const float LM35_FACTOR =0.01;// do not change

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  Serial.println("Robojax LM35 for Arduino");
  delay(500);
}

// the loop routine runs over and over again forever:
void loop() {
 //robojax.com LM35 Code for Arduino
  printTemperature('C');
  Serial.println();
  printTemperature('F');
  Serial.println();  
  printTemperature('K'); 
  Serial.println();     
  Serial.println();    
//  Serial.print(" Temperature: ");
//  printDegree();    
//  Serial.print(getTemperature('C'));
if(getTemperature('C') >87)
{
 // do somethig here (watch video)
}
//  Serial.println();
  delay(1000);
}



/*
 * getTemperature()
 * @brief gets the average temperature
 * @param average temperature
 * @param "type" is character
 *     C = Celsius
 *     K = Keliven
 *     F = Fahrenheit
 * @return returns one of the values above
 * Written by Ahmad Shamshiri for robojax.com
 * on May 08, 2020 at 02:36 in Ajax, Ontario, Canada
 */
float getTemperature(char type)
{
    float value;
    float averageTemperature =0;
    int sensorValue = analogRead(inPin);
    float voltage = sensorValue * (5.0 / 1023.0); 
    float temperature = voltage / LM35_FACTOR;
    for(int i=0; i< iteration; i++)
    {
      averageTemperature += temperature;
    }

    averageTemperature /=iteration;
  if(type =='F')
   {
    value = averageTemperature *9/5 + 32;//convert to Fahrenheit 
   }else if(type =='K')
   {
    value = averageTemperature + 273.15;//convert to Kelvin
   }else{
    value = averageTemperature;// return Celsius
   }    
    return value ;
}//getTemperature()

/*
 * printTemperature()
 * @brief prints  temperature on serial monitor
 * @param charact type
 * @param "type" is character
 *     C = Celsius
 *     K = Keliven
 *     F = Fahrenheit
 * @return none
 * Written by Ahmad Shamshiri for robojax.com
 * on May 08, 2020 at 02:45 in Ajax, Ontario, Canada
 */
void printTemperature(char type)
{
    float value;
    float temp = getTemperature(type);
   Serial.print(temp);
    printDegree();    
  if(type =='F')
   {
     Serial.print("F");
    }else if(type =='K')
   {
     Serial.print("K");
   }else{
     Serial.print("C");
   }    
 
}//printTemperature()

/*
 * @brief prints degree symbol on serial monitor
 * @param none
 * @return returns nothing
 * Written by Ahmad Shamshiri on July 13, 2019
 * for Robojax Tutorial Robojax.com
 */
void printDegree()
{
    Serial.print("\xC2"); 
    Serial.print("\xB0");  
}