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Lesson 38: Using MLX90614 Infrared Temperature Sensor with Arduino

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Part 4: Temperature Sensors

In this lesson we learn how to use MLX90614 Infrered Temperature Sensor and measure the temperature and display it on the serial monitor.


 /*************************************************** 
 * Robojax Arduino Step By Step Course
 * Part 4: Temperature Sensors
  This is a library example for the MLX90614 Temp Sensor
Original Library and code source: https://github.com/adafruit/Adafruit-MLX90614-Library

 The code has been updated. I have added two funcitons. Also the Kelivin
 value added into the C and F units.
 1-First function to print the temperature on Serial Monitor
 2-2nd Funciton return the temperature so it can be used for Display or other purpose
 
  Please watch video instruction here https://youtu.be/548PLHgZkoQ
 This code is available at http://robojax.com/course1/?vid=lecture37
 
with over 100 lectures Free On  YouTube Watch it here http://robojax.com/L/?id=338
Get the code for the course: http://robojax.com/L/?id=339  
 * 

If you found this tutorial helpful, please support me so I can continue creating 
content like this. You can support me on Patreon http://robojax.com/L/?id=63

or make donation using PayPal http://robojax.com/L/?id=64

 *  * 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/>.

Origin
  Written by Limor Fried/Ladyada for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Wire.h>
#include <Adafruit_MLX90614.h>
char *typeName[]={"Object","Ambient"};

Adafruit_MLX90614 mlx = Adafruit_MLX90614();

void setup() {
	// Robojax.com Code YouTube Watch it here http://robojax.com/L/?id=338
  Serial.begin(9600);

  Serial.println("Robojax MLX90614 test");  

  mlx.begin();  
}

void loop() {
  //Robojax Example for MLX90614
  printTemp('C');
  printTemp('D');
  
  printTemp('F');  
  printTemp('G'); 
  if( getTemp('C')>40)
  {
    //do something here
  }
  
  printTemp('K');   
  printTemp('L');  
  Serial.println("======");

  delay(3000);
  //Robojax Example for MLX90614
}

/*
 * @brief returns temperature or relative humidity
 * @param "type" is character
 *     C = Object Celsius
 *     D = Ambient Celsius
 *     
 *     K = Object Keliven
 *     L = Ambient in Keilven
 *     
 *     F = Object Fahrenheit
 *     G = Ambient in Fahrenheit

 * @return returns one of the values above
 * Usage: to get Fahrenheit type: getTemp('F')
 * to print it on serial monitor Serial.println(getTemp('F'));
 * Written by Ahmad Shamshiri on Mar 30, 2020. 
 * in Ajax, Ontario, Canada
 * www.Robojax.com 
 */
float getTemp(char type)
{
   // Robojax.com MLX90614 Code
   	// Robojax.com Code YouTube Watch it here http://robojax.com/L/?id=338
  float value;
    float tempObjec = mlx.readObjectTempC();//in C object
    float tempAmbient = mlx.readAmbientTempC();
   if(type =='F')
   {
    value = mlx.readObjectTempF(); //Fah. Object
   }else if(type =='G')
   {
    value = mlx.readAmbientTempF();//Fah Ambient
   }else if(type =='K')
   {
    value = tempObjec + 273.15;// Object Kelvin
   }else if(type =='L')
   {
    value = tempAmbient + 273.15;//Ambient Kelvin
   }else if(type =='C')
   {
    value = tempObjec;
   }else if(type =='D')
   {
    value = tempAmbient;
   }
   return value;
    // Robojax.com MLX90614 Code
}//getTemp

/*
 * @brief nothing
 * @param "type" is character
 *     C = Object Celsius
 *     D = Ambient Celsius
 *     
 *     K = Object Keliven
 *     L = Ambient in Keilven
 *     
 *     F = Object Fahrenheit
 *     G = Ambient in Fahrenheit

 * @return prints temperature value in serial monitor
 * Usage: to get Fahrenheit type: getTemp('F')
 * to print it on serial monitor Serial.println(getTemp('F'));
 * Written by Ahmad Shamshiri on Mar 30, 2020 at 21:51
 * in Ajax, Ontario, Canada
 * www.Robojax.com 
 */
void printTemp(char type)
{
  float tmp =getTemp(type);

  if(type =='C')
  {
    Serial.print(typeName[0]);
    Serial.print(" ");    
    Serial.print(tmp);
    Serial.print("°");      
    Serial.println("C");
  }else if(type =='D')
  {
    Serial.print(typeName[1]);
    Serial.print(" ");     
    Serial.print(tmp);
    Serial.print("°");      
    Serial.println("C");
  }else if(type =='F')
  {
    Serial.print(typeName[0]);
    Serial.print(" ");     
    Serial.print(tmp);
    Serial.print("°");      
    Serial.println("F");
  }else if(type =='G')
  {
    Serial.print(typeName[1]);
    Serial.print(" ");     
    Serial.print(tmp);
    Serial.print("°");      
    Serial.println("F");
  }

  else if(type =='K')
  {
    Serial.print(typeName[0]);
    Serial.print(" ");     
    Serial.print(tmp);  
    Serial.print("°");       
    Serial.println(" K");
  }  
  else if(type =='L')
  {
    Serial.print(typeName[1]);
    Serial.print(" ");     
    Serial.print(tmp);  
    Serial.print("°");       
    Serial.println(" K");
  }


}//printTemp(char type)
 
     

   

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