Related or required files and link to this lesson
Lesson 46: Using MLX90614 with LCD
Lesson 46: Using MLX90614 with LCD
Please select other codes for this lecture from the links below.
Part 4: Temperature Sensors
In this lesson we learn how to use MLX90614 touchless infrared temperature sensor with LCD2004 and Arduino. There is separate code for LCD1602.
/******
* Robojax Arduino Step By Step Course
* Part 4: Temperature Sensors
* Lesson 46, MLX90614 with LCD2004
This is a library example for the MLX90614 Temp Sensor
Original Library and code source: https://github.com/adafruit/Adafruit-MLX90614-Library
Please watch video instruction here https://youtu.be/IAj0gHTTWfw
Introduction video is https://youtu.be/548PLHgZkoQ
This code is available at http://robojax.com/course1/?vid=lecture46
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
This is a library example for the MLX90614 Temp Sensor
Original Library and code source: https://github.com/adafruit/Adafruit-MLX90614-Library
this code has been mostly updated
it displays the temperature on LCD1602 or LCD2004 in C, F and K for object and for ambient
updated/written by Ahmad Shamshiri on Jun 28, 2020
* in Ajax, Ontario, Canada. www.robojax.com
* Get this code and other Arduino codes from Robojax.com
Learn Arduino step by step in structured course with all material, wiring diagram and library
all in once place. Purchase My course on Udemy.com http://robojax.com/L/?id=62
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();
#include <LiquidCrystal_I2C.h>
const uint8_t I2C_ADDRESS =0x27;
const uint8_t LCD_CHAR= 20;
const uint8_t LCD_ROW= 4;
char type ='C';// what to display. Watch video for details
bool ambient=1;//1=yes , 0=no
// C = Celsius
// K = Keliven
// F = Fahrenheit
LiquidCrystal_I2C lcd(I2C_ADDRESS, LCD_CHAR,LCD_ROW);
void setup() {
Serial.begin(9600);
Serial.println("Robojax MLX90614 test");
mlx.begin();
Wire.begin();
lcd.begin();
lcd.backlight();
lcd.print("Robojax MLX90614");
lcd.setCursor(0,1);
lcd.print("Infrared Temp.");
delay(2000);
clearCharacters(1,0, LCD_CHAR-1);
lcd.setCursor(0,1);
lcd.print(typeName[0]);
lcd.setCursor(0,2);
lcd.print(typeName[1]);
}//setup() end
void loop() {
//Robojax.com code for MLX90614 Infrared Sensor on LCD
if(type =='C')
{
printTemp('C');//object temperature in C
}
//Robojax Example for MLX90614 with LCD
if(type =='F')
{
printTemp('F');//object temperature in F
}
if(type =='K')
{
printTemp('K');//object temperature in K
}
if( getTemp('C')>40)
{
//do something here
}
delay(2000);
//Robojax Example for MLX90614 with LCD2004
}
/*
* @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 code for MLX90614 Infrared Sensor on LCD
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 code for MLX90614 Infrared Sensor on LCD
}//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)
{
//Robojax.com code for MLX90614 Infrared Sensor on LCD
float tmp =getTemp(type);
if(type =='C')
{
clearCharacters(1,strlen(typeName[0])-1, LCD_CHAR-1 );
lcd.setCursor(strlen(typeName[0])-1,1);
lcd.print(": ");
lcd.print(tmp);
lcd.print((char)223);//
lcd.print("C");
clearCharacters(2,strlen(typeName[1])-1, LCD_CHAR-1 );
lcd.setCursor(strlen(typeName[1])-1,2);
lcd.print(": ");
lcd.print(getTemp('D'));
lcd.print((char)223);//
lcd.print("C");
}else if(type =='F')
{
clearCharacters(1,strlen(typeName[0])-1, LCD_CHAR-1 );
lcd.setCursor(strlen(typeName[0])-1,1);
lcd.print(": ");
lcd.print(tmp);
lcd.print((char)223);//
lcd.print("F");
clearCharacters(2,strlen(typeName[1])-1, LCD_CHAR-1 );
lcd.setCursor(strlen(typeName[1])-1,2);
lcd.print(": ");
lcd.print(getTemp('F'));
lcd.print((char)223);//
lcd.print("F");
}
else if(type =='K')
{
clearCharacters(1,strlen(typeName[0])-1, LCD_CHAR-1 );
lcd.setCursor(strlen(typeName[0])-1,1);
lcd.print(": ");
lcd.print(getTemp('K'));
lcd.print((char)223);//
lcd.print("K");
clearCharacters(2,strlen(typeName[1])-1, LCD_CHAR-1 );
lcd.setCursor(strlen(typeName[1])-1,2);
lcd.print(": ");
lcd.print(getTemp('L'));
lcd.print((char)223);//
lcd.print("K");
}
//Robojax.com code for MLX90614 Infrared Sensor on LCD
}//printTemp(char type)
/*
clearCharacters(uint8_t row,uint8_t start, uint8_t stop)
* @brief clears a line of display (erases all characters)
* @param none
* @return does not return anything
* Written by Ahmad Shamshiri
* www.Robojax.com code May 28, 2020 at 16:21 in Ajax, Ontario, Canada
*/
void clearCharacters(uint8_t row,uint8_t start, uint8_t stop )
{
for (int i=start; i<=stop; i++)
{
lcd.setCursor (i,row); //
lcd.write(254);
}
}//clearCharacters