Other Arduino Codes and Videos by Robojax
In this tutorial we learn how to us the long range infrared non-contact MLX90614ESF-DCI temperature sensor with medical accuracy to measure temperature from 20cm up to 50cm. This is the medical accuracy version which need special code and power supply dependency compensation and we will read use 3.3V power from Arduino and read the voltage and compensate the reading of temperature.
/***************************************************
This is a library example for the MLX90614 Temp Sensor
Original Library and code source: https://github.com/adafruit/Adafruit-MLX90614-Library
The is Arduino code used from the above library for MLX90614 and have been updated heavily.
this code to use MLX90614-DCI the long range medical accuracy infrared Temperature sensor to measure
the temperature with accuracy and compensation of power supply dependancey.
Please watch the video for details. We will acheive up to 20cm to 49cm readin range where the
object size becomes 4.3cm or 43mm.
*
* Watch video instructions for this code: https://youtu.be/jN86PSAHMbw
updated/written by Ahmad Shamshiri on July 18, 2020, 2020
* 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/>.
Origin
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/
const int votageInputPin =A0;
const float arduinoVoltage = 5.0;//Operating voltage of Arduino. either 3.3V or 5.0V
#include <Wire.h>
#include <Adafruit_MLX90614.h>
char *typeName[]={"Object","Ambient"};
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
float tempObjecC, tempObjecF, tempAmbientC ,tempAmbientF, tempObjecK, tempAmbientK;
void setup() {
Serial.begin(9600);
Serial.println("Robojax MLX90614 test");
mlx.begin();
}
void loop() {
//Robojax Example for MLX90614-DCI medical accuracy long range version
printTemp('C');
// printTemp('D');
//
// printTemp('F');
// printTemp('G');
// if( getTemp('C')>40)
// {
//do something here
// }
// printTemp('K');
// printTemp('L');
// Serial.println("======");
//printVoltage();// this line will read the input voltage and dispalys it on serial monitor
delay(1000);
//Robojax Example for MLX90614-DCI medical accuracy long range version
}
/*
* @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 Example for MLX90614-DCI medical accuracy long range version
float value;
tempObjecC = mlx.readObjectTempC();//in C object
tempAmbientC = mlx.readAmbientTempC();
tempObjecF = mlx.readObjectTempF(); //Fah. Object
tempAmbientF = mlx.readAmbientTempF();//Fah Ambient
dependencyComp();
if(type =='F')
{
value = tempObjecF;
}else if(type =='G')
{
value = tempAmbientF;
}else if(type =='K')
{
value = tempObjecC + 273.15;// Object Kelvin
}else if(type =='L')
{
value = tempAmbientC + 273.15;//Ambient Kelvin
}else if(type =='C')
{
value = tempObjecC;
}else if(type =='D')
{
value = tempAmbientC;
}
return value;
//Robojax Example for MLX90614-DCI medical accuracy long range version
}//getTemp
/*
* fixes the voltage dependancey of measurement
* This funciton updates the reading of temperature by reading
* the power supply voltage and compensating it.
* see page 37 of datasheet here: https://robojax.com/learn/arduino/robojax_MLX90614_Datasheet-Melexis.pdf
* T=T0 - (VCC-3) *0.6
*/
void dependencyComp()
{
//Robojax Example for MLX90614-DCI medical accuracy long range version
int value = analogRead(votageInputPin);// read the input
float voltage = value * (arduinoVoltage / 1023.0);//get the voltage from the value above
//Serial.println(voltage);
tempObjecC = tempObjecC - (voltage -3) * 0.6;
tempAmbientC = tempAmbientC - (voltage -3) * 0.6;
tempObjecF = tempObjecF - (voltage -3) * 0.6;
tempAmbientF = tempAmbientF - (voltage -3) * 0.6;
tempObjecK = tempObjecK - (voltage -3) * 0.6;
tempAmbientK = tempAmbientK - (voltage -3) * 0.6;
//Robojax Example for MLX90614-DCI medical accuracy long range version
}//dependencyComp() ends here
/*
* @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)
{
//Robojax Example for MLX90614-DCI medical accuracy long range version
float tmp =getTemp(type);
if(type =='C')
{
Serial.print(typeName[0]);
Serial.print(" ");
Serial.print(tmp);
printDegree();
Serial.println("C");
}else if(type =='D')
{
Serial.print(typeName[1]);
Serial.print(" ");
Serial.print(tmp);
printDegree();
Serial.println("C");
}else if(type =='F')
{
Serial.print(typeName[0]);
Serial.print(" ");
Serial.print(tmp);
printDegree();
Serial.println("F");
}else if(type =='G')
{
Serial.print(typeName[1]);
Serial.print(" ");
Serial.print(tmp);
printDegree();
Serial.println("F");
}
else if(type =='K')
{
Serial.print(typeName[0]);
Serial.print(" ");
Serial.print(tmp);
printDegree();
Serial.println(" K");
}
else if(type =='L')
{
Serial.print(typeName[1]);
Serial.print(" ");
Serial.print(tmp);
printDegree();
Serial.println(" K");
}
//Robojax Example for MLX90614-DCI medical accuracy long range version
}//printTemp(char type)
/*
* printDegree()
* prints degree symble on serial monitor
* written by Ahmad Shamshiri for Robojax.com
*
*/
void printDegree()
{
Serial.print("\xC2\xB0");
}
/*
* printVoltage()
* prints voltage at pin "voltageInputPin"
* on serial monitor.
*/
void printVoltage()
{
//Robojax Example for MLX90614-DCI medical accuracy long range version
int value = analogRead(votageInputPin);// read the input
float voltage = value * (arduinoVoltage / 1023.0);//get the voltage from the value above
Serial.print("Voltage: ");
Serial.print(voltage);
Serial.println("V");
//Robojax Example for MLX90614-DCI medical accuracy long range version
}// printVoltage()
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