Don Luc Electronics

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Infrared Temperature Sensor MLX90614

The MLX90614 infrared temperature sensor is a digital device that allows for contactless temperature measurement using the infrared radiation emitted by objects. This module integrates the Melexis MLX90614 sensor, which includes a thermopile to detect IR radiation and an internal processor that converts this signal into compensated temperature values for both the object and the ambient temperature. Its operation is based on the principle that all bodies emit infrared radiation proportional to their temperature; the sensor captures this radiation and translates it into a precise digital value. The MLX90614 offers measurements from -70 °C to 380 °C for object temperature and from -40 °C to 170 °C for ambient temperature, with a typical accuracy of ±0.5 °C. It primarily communicates via I2C facilitating its integration with microcontrollers.

The MLX90614 infrared temperature sensor is used in applications requiring contactless temperature measurement, making it ideal for digital thermometers, medical monitoring, temperature control in machinery, industrial systems, ovens, smart appliances, weather stations, and robotics projects.

DL2606Mk02

1 x DFRobot FireBeetle 2 ESP32-E
1 x Fermion: 3.5” 480×320 TFT LCD Capacitive
1 x GDL Line 10 CM
1 x Infrared Temperature Sensor MLX90614
1 x Gravity: AHT20 Temperature and Humidity Sensor
1 x Gravity: IO Shield for FireBeetle 2
1 x Terminal Block Board for FireBeetle 2 ESP32-E IoT
1 x Lithium Ion Battery – 1000mAh
1 x USB 3.0 to Type-C Cable

DL2606Mk02p

DL2606Mk02p.ino

/****** Don Luc Electronics © ******
Software Version Information
Project #15: Environment - Infrared Temperature Sensor MLX90614 - Mk42
15-42
DL2606Mk02p.ino
DL2606k02
1 x DFRobot FireBeetle 2 ESP32-E
1 x Fermion: 3.5” 480x320 TFT LCD Capacitive
1 x GDL Line 10 CM
1 x Infrared Temperature Sensor MLX90614
1 x Gravity: AHT20 Temperature and Humidity Sensor
1 x Gravity: IO Shield for FireBeetle 2
1 x Terminal Block Board for FireBeetle 2 ESP32-E IoT
1 x Lithium Ion Battery - 1000mAh
1 x USB 3.0 to Type-C Cable
*/

// Include the Library Code
// EEPROM Library to Read and Write EEPROM with Unique ID for Unit
#include "EEPROM.h"
// DFRobot Display GDL API
#include <DFRobot_GDL.h>
// AHT20 Humidity and Temperature Sensor
#include <DFRobot_AHT20.h>
// Wire
#include <Wire.h>
// MLX90614
#include <Adafruit_MLX90614.h>

// MLX90614
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
// MLX90614
float fAmbiente = 0;
float fObject = 0;

// AHT20 Humidity and Temperature Sensor
DFRobot_AHT20 aht20;
// AHT20 Humidity and Temperature Sensor
float h = 0;
float t = 0;

// Defined ESP32
#define TFT_DC  D2
#define TFT_CS  D6
#define TFT_RST D3

/*dc=*/ /*cs=*/ /*rst=*/
// DFRobot Display 320x480
DFRobot_ILI9488_320x480_HW_SPI screen(TFT_DC, TFT_CS, TFT_RST);

// Software Version Information
// EEPROM Unique ID Information
#define EEPROM_SIZE 64
String uid = "";

// Software Version Information
String sver = "15-42";

void loop() {
  
  // isMLX90614
  isMLX90614();
  
  // AHT20 Humidity and Temperature Sensor
  isHT();

  // isDisplay Infrared Temperature Sensor MLX90614
  isDisplayMLX90614();

  // Delay 2 Second
  delay( 2000 );

}

getDisplay.ino

// DFRobot Display 320x480
// DFRobot Display 320x480 - UID
void isDisplayUID(){

  // DFRobot Display 320x480
  // Text Display
  // Text Wrap
  screen.setTextWrap(false);
  // Rotation
  screen.setRotation(3);
  // Fill Screen => black
  screen.fillScreen(0x0000);
  // Text Color => white
  screen.setTextColor(0xffff);
  // Font => Free Sans Bold 12pt
  screen.setFont(&FreeSansBold12pt7b);
  // TextSize => 1.5
  screen.setTextSize(1.5);
  // Don Luc Electronics
  screen.setCursor(0, 30);
  screen.println("Don Luc Electronics");
  // Tilt Switch
  screen.setCursor(0, 60);
  screen.println("Infrared Temperature MLX90614");
  // Version
  screen.setCursor(0, 90);
  screen.println("Version");
  screen.setCursor(0, 120);
  screen.println( sver );
  // EEPROM
  screen.setCursor(0, 150);
  screen.println("EEPROM");
  screen.setCursor(0, 180);
  screen.println( uid );

}
// isDisplay MLX90614
void isDisplayMLX90614(){

  // DFRobot Display 320x480
  // Text Display
  // Text Wrap
  screen.setTextWrap(false);
  // Rotation
  screen.setRotation(3);
  // Fill Screen => white
  screen.fillScreen(0xffff);
  // Text Color => blue
  screen.setTextColor(0x001F);
  // Font => Free Sans Bold 12pt
  screen.setFont(&FreeSansBold12pt7b);
  // TextSize => 1.5
  screen.setTextSize(1.5);
  // Vibration Senso
  screen.setCursor(0, 30);
  screen.println("Infrared Temperature MLX90614");
  // Humidity
  screen.setCursor(0, 70);
  screen.println("Humidity");
  screen.setCursor(0, 100);
  screen.print( h );
  screen.setCursor(65, 100);
  screen.println( "%RH" );
  // Temperature
  screen.setCursor(0, 140);
  screen.println("Temperature");
  screen.setCursor(0, 170);
  screen.print( t );
  screen.setCursor(65, 170);
  screen.println( "C" );
  // MQ-3 Alcohol Detector
  screen.setCursor(0, 210);
  screen.println("Infrared Temperature MLX90614");
  screen.setCursor(0, 240);
  screen.print( "Ambiente: " );
  screen.setCursor(130, 240);
  screen.print( fAmbiente );
  screen.setCursor(200, 240);
  screen.println( "C" );
  screen.setCursor(0, 265);
  screen.print( "Object: " );
  screen.setCursor(130, 265);
  screen.print( fObject );
  screen.setCursor(200, 265);
  screen.println( "C" );
  
}

getEEPROM.ino

// isUID EEPROM Unique ID
void isUID()
{
  
  // Is Unit ID
  uid = "";
  for (int x = 0; x < 7; x++)
  {
    uid = uid + char(EEPROM.read(x));
  }
  
}

getgetHT.ino

// AHT20 Humidity and Temperature Sensor
void isHT(){

  if(aht20.startMeasurementReady(true)){

    // Humidity
    h = aht20.getHumidity_RH();
  
    // Temperature
    t = aht20.getTemperature_C();
    
   }
  
}

getMLX90614.ino

// Infrared Temperature Sensor MLX90614
// isMLX90614
void isMLX90614(){

  fAmbiente = mlx.readAmbientTempC();

  fObject = mlx.readObjectTempC();

}

setup.ino

// Setup
void setup()
{
 
  // Delay
  delay( 100 );

   // EEPROM Size
  EEPROM.begin(EEPROM_SIZE);
  
  // EEPROM Unique ID
  isUID();

  // Delay
  delay(100);

  // DFRobot Display 320x480
  screen.begin();

  // Delay
  delay( 100 );

  // AHT20 Humidity and Temperature Sensor
  aht20.begin();

  // Delay
  delay( 100 );

  // Infrared Temperature Sensor MLX90614
  mlx.begin();

  // Delay
  delay( 100 );

  // DFRobot Display 320x480 - UID
  // Don Luc Electronics
  // Version
  // EEPROM
  isDisplayUID();

  // Wait for the sensor to heat up for 20 seconds
  delay( 5000 );

}

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