Published June 17, 2017 © GPL3+

MyRemote Temperature MLX90614 Controlled by Photon

An infrared temperature sensor is suitable to signal the temperature without a touch/contact.

BeginnerProtip1 hour1,425

MyRemote Temperature MLX90614 Controlled by Photon

Things used in this project

Hardware components

Particle Photon

MLX90614

also named GY-906 or D108A08

Resistor 10k ohm

Breadboard (generic)

Jumper wires (generic)

Story

In addition to yesterday's project on the application of a water-resistant temperature sensor, I now complete a further description of a test with an infrared temperature sensor, named MLX90614ESF alias GY-906 or D108A08.

I bought this sensor to measure the oven temperature behind the sealed disk. Another area of application would be the milk of the baby bottle or temperature check of a cool blond beer.

After finding the necessary Libary "Adafruit_MLX90614" with help from the great Particle Community, the wiring was a simple matter: after all, the sensor offers I2C communication, which is realized at the Photon via 2 PINs (D0 = SDA + D1 = SCL). Another project, which deals with a BME280 and the issue via an OLE display about I2C, can be found here.

You need to wire 2x 10k Ohm resistors to get realistic values (3V3<>D0 and 3V3<>D1).

remember on 2x 10k Ohm resistors

The sensor can NOT be used to detect heat or cold bridges at a property: the target object is very close (up to 5 cm) to the sensor. In my experience, I can not sign the only searchable example for me. In the case of the sensor used here with the supplement ESF in the name, I was able to browse through the website of Adafruit and the datasheet available there on the manufacturer's side.

Facts:

Factory calibrated

-40°C to +125°C for sensor temperature

-70°C to +380°C for object temperature

±0.5°C accuracy around room temperatures

High accuracy of 0.5°C over wide temperature

90° Field of view

2.7 to 3.6V power

I2C interface, 0x5A is the fixed 7-bit address

The sketch shows the two values: one for the ambient temperature (temp ambient) and one for the object temperature (temp object), running on the serial monitor and/or as a published value within the Particle Cloud.

Conclusions

A real area of application does not occur to me, which I would trust my 7 Euro sensor; the sensor was already at the breakfast table for excitement provided: the milk to the muesli was just like an ice bag from the ice compartment not cold enough and I led a discussion on whether the coffee surface is measured or the coffee liquid in the cup itself I can not answer to what extent the sensor is measuring into the target object. For this I would have had to take the yesterday's water-proof Dallas sensor into the experiment setup with in order to come to a real correlation of the values.

Like my description? You will find more under my account.

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Here is my Paypal link. You can also send me sensors, which I then like to look at times.

Remark: Konstantin Dimitrov describes in his project a similar construction using the same sensor with regard to the Arduino.

Original Example Code from Libary

/***************************************************
  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/1748
  ----> https://www.adafruit.com/products/1749

  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 <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());
  //String ambient_tempc = String(mlx.readAmbientTempC());
  //Particle.publish("Ambient Temp Grad Celsius", ambient_tempc, PRIVATE); // publish to cloud
  
  Serial.print("*C\tObject = "); Serial.print(mlx.readObjectTempC()); Serial.println("*C");
  String object_tempc = String(mlx.readObjectTempC());
  Particle.publish("Object Temp Grad Celsius", object_tempc, PRIVATE); // publish to cloud
  
  //Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempF());
  //Serial.print("*F\tObject = "); Serial.print(mlx.readObjectTempF()); Serial.println("*F");

  Serial.println();
  
  delay(500);
}

Credits

Ingo Lohs

182 projects • 194 followers

I am well over 50 years and come from the middle of Germany.

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MyRemote Temperature MLX90614 Controlled by Photon

MyRemote Temperature MLX90614 Controlled by Photon

Things used in this project

Hardware components

Story

Facts:

Conclusions

Code

Original Example Code from Libary

Credits

Ingo Lohs

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