MLX90614 non contact infrared temperature sensor with Arduino, MLX90614 Emissivity Calibration

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Project Description:
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In today’s episode, you will learn how to make a contactless Temperature monitoring system using MLX90614 non-contact infrared temperature sensor, Arduino, and SSD1306 i2c supported Oled display module. This is the Gravity I2C supported Non-contact IR Temperature sensor which I recently got from the DFrobot. This is a medical-grade Non-contact temperature sensor and offers an accuracy of ±0.2˚C in a limited temperature range around the Human body temperature.

As a standard, the MLX90614 is calibrated for an object emissivity of 1. I have seen guys completely ignoring the emissivity value when using the MLX90614 infrared temperature sensor. Let me first explain what is Emissivity and then I will practically explain what happens when you ignore the Emissivity value.

Emissivity:

Emissivity is a measure of the efficiency in which a surface emits thermal energy. It is defined as the fraction of energy being emitted relative to that emitted by a thermally black surface or a black body. A black body is a material that is a perfect emitter of heat energy and has an emissivity value of 1. A material with an emissivity value of 0 would be considered a perfect thermal mirror.

For example, if an object had the potential to emit 100 units of energy but only emits 90 units in the real world, then that object would have an emissivity value of 0.90. In the real world, there are no perfect "black bodies" and very few perfect infrared mirrors so most objects have an emissivity between 0 and 1.

Different objects have different emissivity values and when you ignore the emissivity value then you will end up getting the wrong temperature readings. As I said earlier, as a standard, the MLX90614 is calibrated for an object emissivity of 1. So, let’s say if you want to measure the temperature of a human body then you will need to recalibrate your MLX90614 non-contact infrared temperature sensor. Let me practically show you.

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Arduino Nano USB-C Type ( recommended):

ESP32 WiFi + Bluetooth Module for iOT Projects (recommended), more IO pins, improved speed, and supports a Lipo Battery:

MLX90614 non-contact infrared temperature sensor

SSD1306 Oled display Module

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16×2 i2c LCD

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[romeohamzakhan]

This is my favourite channel. I especially like it when you explain everything so nicely. I wish you a lot of success with the channel and happy life.

[stephangomez]

Thank you for such a thorough explanation on the MLX90614 board, it is super helpful.

[Avnish-skll]

Hello Respected Sir

I Have A Request For You pls Make a Separate Video On How To Control Three Phase Motor With Current Sensor And three phase Line Sensor Also Controlled With A App

[wildkev]

Could I use this to read my belt temperature on my Side by Side? Connecting it to the Belt housing and having the temp screen in the cabin with me? Great video and TIA!

[hosomiii]

Hello i did the same thing but my outputs are now negative and over a hundred. Also before i tweaked the emissivity the sensor only gets accurate reading on physical contact. Do anyone know what to do?

[snaveenkumar]

i can't access to get the code which is you provided link.

[clivebradley]

You forgot the sun. Sol is a perfect black body.

[FSISThakurAshish]

Pls share the Arduino nano development board file

[FSISThakurAshish]

Bro pls help and share the pcb development board file