Temperture Sensor Reading Extremely High

Other Hardware Sensors
1

Hello, I have a Non-contact IR Sensor Module which features the MLX90614 sensor, I have connected it to my arduino nano with the following pins:
5v <- VIN
GND <- GND
SCL <- A5
SDA <- A4

When I upload the code, my serial port outputs 2000 Degress C and 2700 Degress F.
I was wondering if their is an issue with software ie code, or if my sensor is just broken.

DataSheet (https://www.jaycar.com.au/medias/sys_master/images/9292328894494/XC3704-dataSheetMain.pdf)
Manual (https://www.jaycar.com.au/medias/sys_master/images/9292328861726/XC3704-manualMain.pdf)

I have used the exmaple code:

/*************************************************** 
  This is a library example for the MLX90614 Temp Sensor

  Designed specifically to work with the MLX90614 sensors in the
  adafruit shop
  ----> https://www.adafruit.com/products/1747 3V version
  ----> https://www.adafruit.com/products/1748 5V version

  These sensors use I2C to communicate, 2 pins are required to  
  interface
  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  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>

Adafruit_MLX90614 mlx = Adafruit_MLX90614();

void setup() {
  Serial.begin(9600);

  Serial.println("Adafruit MLX90614 test");  

  mlx.begin();  
}

void loop() {
  Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempC()); 
  Serial.print("*C\tObject = "); Serial.print(mlx.readObjectTempC()); Serial.println("*C");
  Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempF()); 
  Serial.print("*F\tObject = "); Serial.print(mlx.readObjectTempF()); Serial.println("*F");

  Serial.println();
  delay(500);
}
2

My first step with any new I2C device is to run the I2CScanner.ino example program.

It scans the I2C bus and reports what devices are connected and at what addresses they are. This will verify your sensor is connected and responding to commands.

I usually perform this test before I even load my project code.

John

3

Hello John, I have ran a I2CScanner code and it outputs:

I2C Scanner
Scanning...
I2C device found at address 0x1B !
done

Here is the code for I2C Scanner:

#include <Wire.h>
 
 
void setup()
{
  Wire.begin();
 
  Serial.begin(9600);
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
}
 
 
void loop()
{
  byte error, address;
  int nDevices;
 
  Serial.println("Scanning...");
 
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
 
    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");
 
      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknown error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
 
  delay(5000);           // wait 5 seconds for next scan
}